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Superconductor Science and Technology
Journal Prestige (SJR): 1.036
Citation Impact (citeScore): 3
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0953-2048 - ISSN (Online) 1361-6668
Published by IOP Homepage  [40 journals]
  • Multi-mode architectures for noise-resilient superconducting qubits

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      Authors: Alessio Calzona; Matteo Carrega
      First page: 023001
      Abstract: Great interest revolves around the development of new strategies to efficiently store and manipulate quantum information in a robust and decoherence-free fashion. Several proposals have been put forward to encode information into qubits that are simultaneously insensitive to relaxation and to dephasing processes. Among all, given their versatility and high-degree of control, superconducting qubits have been largely investigated in this direction. Here, we present a survey on the basic concepts and ideas behind the implementation of novel superconducting circuits with intrinsic protection against decoherence at a hardware level. In particular, the main focus is on multi-mode superconducting circuits, the paradigmatic example being the so-called circuit. We report on their working principle and possible physical implementations based on conventional Josephson elements, presenting recent experimental realizations, discussing both fabrication methods and characterizations.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-23T00:00:00Z
      DOI: 10.1088/1361-6668/acaa64
      Issue No: Vol. 36, No. 2 (2022)
       
  • Doping dependence of the upper critical field in untwinned
           YBa2Cu3O 7−δ thin films

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      Authors: Eric Wahlberg; Riccardo Arpaia, Alexei Kalaboukhov, Thilo Bauch Floriana Lombardi
      First page: 024001
      Abstract: We report on measurements of the doping dependence of the upper critical field in 50 nm thick YBa2Cu3O films. The films are untwinned and are characterized by a small in-plane compressive strain. We find that the shows a strong decrease in the underdoped region of the phase diagram, in agreement with that which has been measured in relaxed single crystals. The origin of the decrease of in the underdoped regime is discussed within a scenario where charge density wave (CDW) order competes with superconductivity. This demonstrates the potential of using thin films to study the phase diagram of high-Tc materials under strain, and opens up the possibility for investigating the interplay between CDW order and superconductivity tuned by strain.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-20T00:00:00Z
      DOI: 10.1088/1361-6668/aca93b
      Issue No: Vol. 36, No. 2 (2022)
       
  • Anomalous temperature dependence of multiple Andreev reflections in a
           topological insulator Josephson junction

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      Authors: Tobias W Schmitt; Benedikt Frohn, Wilhelm Wittl, Abdur R Jalil, Michael Schleenvoigt, Erik Zimmermann, Anne Schmidt, Thomas Schäpers, Juan Carlos Cuevas, Alexander Brinkman, Detlev Grützmacher Peter Schüffelgen
      First page: 024002
      Abstract: As a promising platform for unconventional superconductivity, Josephson junctions (JJs) of tetradymite topological insulators (TIs) and s-wave superconductors have been investigated in recent years. This family of TI materials, however, often suffers from spurious bulk transport, which hampers the observation of the exotic physics of their topological surface states. Thus, disentangling the transport mechanism of bulk and surface contributions in TI JJs is of high importance when investigating proximity induced superconductivity in those crystals. In this work, we add to the insights regarding these contributions by studying the temperature-dependent behaviour of a Bi2Te3-based JJ with transparent interfaces. In electrical transport measurements, we investigate differential conductance spectra of multiple Andreev reflections (MARs) and find a qualitative temperature-dependent change from peak features at low temperatures to dip features at higher ones. The observation of both kind of MAR patterns in a single JJ suggests contributions of diffusive bulk and ballistic surface states and links to a similar finding in the temperature dependence of the critical current. Our work advances the research of induced superconductivity in TIs and offers new avenues to study the induced superconductivity in the topological surface states of these materials.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-21T00:00:00Z
      DOI: 10.1088/1361-6668/aca4fe
      Issue No: Vol. 36, No. 2 (2022)
       
  • Critical current asymmetry in HTS switches using iron-core electromagnets

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      Authors: James H P Rice; Ross W Taylor, Dominic A Moseley, Alexander Petrov, Heng Zhang, Steven Wray, Jianzhao Geng Rodney A Badcock
      First page: 025001
      Abstract: Iron-core electromagnets are widely used as applied-field switches in high-temperature superconducting (HTS) flux pumps. It was recently reported that the critical current () of the HTS wire is suppressed by up to 45% in the air gap of the iron core. Here, it is reported that the self-field of a single tape (unifilar) is suppressed from 357 A to 195 A while in the air gap of an iron core, agreeing closely with the previous study. This is extended by showing that the response to a perpendicular magnetic field is asymmetric, with a peak of 249 A found to be at 0.16 T of applied magnetic field. This effect can be eliminated using an anti-parallel current configuration (bifilar), which is shown experimentally to recover close to the no-core self-field of 357 A with no observed asymmetry. The results of both types of switch configurations are closely replicated in finite-element modelling using COMSOL Multiphysics®. This is caused by the asymmetric interaction between the self-induced magnetic field of the HTS switch element and the magnetic circuit of the iron-core electromagnet.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-15T00:00:00Z
      DOI: 10.1088/1361-6668/aca8d8
      Issue No: Vol. 36, No. 2 (2022)
       
  • Electronic properties of α -Mn-type non-centrosymmetric superconductor
           Re5.5Ta under hydrostatic pressure

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      Authors: Sathiskumar Mariappan; Dilip Bhoi, Manikandan Krishnan, Nagasaki Shoko, Ponniah Vajeeston, Arushi, Roshan Kumar Kushwaha, R P Singh, Arumugam Sonachalam Yoshiya Uwatoko
      First page: 025002
      Abstract: We have studied the effect of hydrostatic pressure on the superconducting and normal state properties of the non-centrosymmetric superconductor Re5.5Ta using magnetotransport, magnetization, and band structure studies. The superconducting transition temperature () reveals a modest decrease of ∼0.52 K as the external pressure is raised to 8 GPa. We found the Maki parameter, both at ambient and high pressures, suggesting the significant role of the Pauli pair breaking effect. Furthermore, the lower critical field was found to decrease with a rate of −1.74 mT GPa−1 as pressure increases to 1.05 GPa. Analysis of the thermally activated flux flow region of using the Arrhenius equation reveals the coexistence of single and collective vortex states. Further analysis of the critical current density indicates that the surface and volume pinning centers coexist and remain unaffected with varying pressure. Band structure calculations were performed using density functional theory and reveal a large bulk modulus, ∼ 289 GPa with ∼ 3.7, suggesting poor compressibility. In addition, we found that the density of states at the Fermi level barely reduces, even at pressures of up to 20 GPa. This is consistent with the experimental observation of robust superconductivity under compression.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-15T00:00:00Z
      DOI: 10.1088/1361-6668/aca83e
      Issue No: Vol. 36, No. 2 (2022)
       
  • Transient liquid assisted growth of superconducting YBa2Cu3O7−x films
           based on pulsed laser deposition

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      Authors: Albert Queraltó; Max Sieger, Kapil Gupta, Alexander Meledin, Pedro Barusco, Lavinia Saltarelli, Mariona de Palau, Xavier Granados, Xavier Obradors Teresa Puig
      First page: 025003
      Abstract: We investigated the integration of transient liquid-assisted growth (TLAG) approach for epitaxial YBa2Cu3O7−x (YBCO) films by physical deposition methodologies (pulsed laser deposition (PLD)), as an additional opportunity for high-throughput growth of YBCO. As a prerequisite, highly flat and amorphous YBCO precursor films were deposited by PLD at temperatures below 400 °C on single-crystalline SrTiO3 (STO) and LaMnO3 (LMO)/STO, as well as industrial coated conductor architectures. Contrary to TLAG based on chemical solution deposition, where BaCO3 elimination is a key factor for the YBCO growth, TLAG-PLD growth is controlled by the transformation of Ba–Cu–O (s) to a transient liquid. High-quality c-axis YBCO films were successfully grown on different substrates, as demonstrated by high-resolution x-ray diffraction and transmission electron microscopy. In-situ resistance measurements revealed that the growth rates around 1000 nm s−1 can be achieved, outperforming the capabilities of standard PLD growth of REBa2Cu3O7 films by few orders of magnitude. Experimental conditions such as temperature, oxygen partial pressure, and heating ramp, were optimized to obtain critical temperature (Tc) values up to 90 K. Critical current densities of 15 MA cm−2 at 5 K and 1.7 MA cm−2 at 77 K were obtained for YBCO films of 450 nm on LMO/STO.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-21T00:00:00Z
      DOI: 10.1088/1361-6668/acaad3
      Issue No: Vol. 36, No. 2 (2022)
       
  • Sensitivity of the thermomagnetic instability in superconducting film to
           magnetic perturbation for electromagnetic interference detection

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      Authors: Lu Jiang; Cun Xue You-He Zhou
      First page: 025004
      Abstract: The time-varying magnetic field with electromagnetic perturbation is regarded as an important parameter for the thermomagnetic stability of superconducting film devices. In this work, using a thermomagnetic model, we investigate the sensitivity of thermomagnetic instability in superconducting films exposed to a linear ramp magnetic field, superposed by the additional AC magnetic perturbation with tunable amplitude and oscillation frequency. Surprisingly, we find that the thermomagnetic instability is a non-monotonic function with the increasing oscillation frequency of the magnetic perturbation, depending on the working temperature and oscillation amplitude. The unexpected non-monotonic sensitivity of the thermomagnetic instability is revealed by the characteristic oscillation of the electric field, which cannot be aggravated by the AC magnetic perturbation at very high frequencies. The findings of this paper demonstrate that the magnetic perturbation at very low or high frequencies is not the main factor that triggers the thermomagnetic instability of superconducting films. Furthermore, using the magnetic moment measurement, we propose possible electromagnetic interference detection by the superconducting film based on such non-monotonic sensitivity of the thermomagnetic instability, which can be used to detect the tunable target electromagnetic interference with characteristic frequency in a complex electromagnetic environment.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-21T00:00:00Z
      DOI: 10.1088/1361-6668/acaa07
      Issue No: Vol. 36, No. 2 (2022)
       
  • The effect of pre-sintering and high-temperature infiltration on the
           properties of single-domain YBCO bulk superconductors by the Y + 011
           top-seeded infiltration growth process

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      Authors: Abulizi Abulaiti; Wan-Min Yang, Ting-Ting Wu Yan-Lan Cui
      First page: 025005
      Abstract: The top-seeded infiltration growth process (TSIG) is one of the most important methods for the fabrication of single-domain rare-earth barium copper oxide (REBCO) bulk superconductors. The performance of samples is in the main closely related to the quality of the solid phase pellets (SPPs). In this paper, we report a new method for optimizing the SPPs and properties of single-domain REBCO bulks, including sintering of the SPPs (Y2O3 + BaCuO2), infiltration of the Ba–Cu–O liquid phase and the melting growth process. A group of single-domain YBCO bulk superconductors with a diameter of 20 mm have been fabricated by the modified RE + 011 TSIG method. Both the levitation force and the trapped field of the samples increase at first and then decrease with increase in the sintering time. The largest levitation force of 42.8 N and trapped field of 0.41 T (77 K, 0.5 T) are obtained in the sample sintered at 1000 °C for 4.5 h; this is mainly related to the optimal microstructure of the pre-sintered SPPs and the YBCO bulk. These results indicate that pre-sintering and high-temperature infiltration is a very important method for controlling the microstructure and improving the physical properties of single-domain YBCO bulk superconductors.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-29T00:00:00Z
      DOI: 10.1088/1361-6668/acaa65
      Issue No: Vol. 36, No. 2 (2022)
       
  • Development of highly selective compact high-temperature superconducting
           quad-band bandpass filter using interdigital feeding structure for radio
           astronomy

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      Authors: Sota Rachi; Keita Sakuma, Takuya Akahori Naoto Sekiya
      First page: 025006
      Abstract: Astronomers at the Mizusawa Very Long Baseline Interferometry Observatory of the National Astronomical Observatory of Japan are promoting the development of broadband receivers in the ultra-high frequency (UHF) band. The presence of extensive radio frequency interferences (RFI) in the UHF band hinders continuous broadband radio observations in this band. A promising technical solution to this problem is to use a superconducting multi-band bandpass filter as it enables the bundling of several RFI-free bands. We have developed a high-temperature superconducting compact quad-band bandpass filter (QB-BPF) at 0.7, 1.4, 1.6, and 2.1 GHz with low loss and steep cutoff characteristics for broadband receivers. That consists of two six-pole dual-band bandpass filters. We have devised an interdigital feeding structure with a high degree of freedom that enables the external quality factor to be designed individually for each band. A compact QB-BPF was fabricated using double-sided YBa2Cu3Oy thin films on a 36.4 mm × 42.0 mm (0.22λg × 0.25λg) Al2O3 substrate. The measurement results agreed well with the simulated ones, indicating that the QB-BPF overcomes the problem of extensive RFI in the UHF band.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-30T00:00:00Z
      DOI: 10.1088/1361-6668/acab38
      Issue No: Vol. 36, No. 2 (2022)
       
  • Quench detection and early warning based on thermoelastic strain rate for
           HTS tapes thermally triggered by heat spots

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      Authors: Jiaxiang Chen; Mingzhi Guan, Yujin Tong, Xingzhe Wang Youhe Zhou
      First page: 015013
      Abstract: The rapid detection and comprehensive monitoring of quench onset and evolution in high-temperature superconducting (HTS) materials remains immensely challenging because the normal zone propagation velocity in HTS materials is two or three orders of magnitude less than that in low-temperature superconductors. In this study, we experimentally and numerically explore quench events triggered by heat spots in yttrium barium copper oxide HTS tapes to characterize the quench onset and propagation. A multiplexed fiber Bragg grating sensor with multiple gratings was used to perform highly accurate strain measurements. Conventional voltage and temperature measurements were performed synchronously on the HTS tapes. A systematic comparison of these multifield signals during quench onset and development illustrated that the evolution of thermoelastic strain and strain-rate in HTS tapes captures the quench onset and propagation. A distinct feature was exhibited during the quenching of a pre-tensioned HTS tape: the thermoelastic strain initially relaxed but subsequently increased until the strain rate exhibited a significant slope change, which corresponded to the quench onset time. The thermoelastic strain in a nearly unconstrained HTS tape gradually increased until quenching occurred. A prominent characteristic for detecting quench onset in HTS materials have been revealed based on the change in the slope of the thermoelastic strain-rate or the second derivative of the strain remaining nearly constant. For a pre-tensioned HTS tape, the minimization of the thermoelastic strain or the strain-rate becoming zero may be a predictor that preceded the quench by ∼1–2 s, which can be, to a certain extent, regarded as an early warning. Another important and novel result was the experimental demonstration of global strain responses distant from the quench location in the pre-tensioned HTS tape, while the temperature and voltage detection are commonly localized methods. The mechanism behind these thermoelastic strain characteristics was further discussed and simulated from the induced Joule heating throughout the quench event. The measurements and numerical predictions suggested a new paradigm of quench detection based on the thermoelastic strain-rate in HTS materials.
      Citation: Superconductor Science and Technology
      PubDate: 2022-12-14T00:00:00Z
      DOI: 10.1088/1361-6668/aca83c
      Issue No: Vol. 36, No. 1 (2022)
       
 
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