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 Superconductor Science and TechnologyJournal Prestige (SJR): 1.036 Citation Impact (citeScore): 3Number of Followers: 3      Hybrid journal (It can contain Open Access articles) ISSN (Print) 0953-2048 - ISSN (Online) 1361-6668 Published by IOP  [74 journals]
• Experimental realization of a hybrid trapped field magnet lens using a
GdBaCuO magnetic lens and MgB 2 bulk cylinder
• Authors: Sora Namba; Hiroyuki Fujishiro, Tomoyuki Naito, Mark D Ainslie Keita Takahashi
First page: 12LT03
Abstract: A hybrid trapped field magnet lens (HTFML) is a promising device that is able to concentrate a magnetic field higher than the applied field continuously, even after removing an external field, which was conceptually proposed by the authors in 2018. This paper presents, for the first time, the experimental realization of the HTFML using a GdBaCuO magnetic lens and MgB 2 trapped field magnet cylinder. A maximum concentrated magnetic field of B c = 3.55 T was achieved at the central bore of the HTFML after removing an applied field of B app = 2.0 T at T = 20 K. For higher B app , the B c value was not enhanced because of a weakened lens effect due to magnetic flux penetration into the bulk GdBaCuO material comprising the lens. The enhancement of the trapped field using such an HTFML for the present experimental setup is discussed in detail.
Citation: Superconductor Science and Technology
PubDate: 2019-11-05T00:00:00Z
DOI: 10.1088/1361-6668/ab5048
Issue No: Vol. 32, No. 12 (2019)

• A tunable superconducting LC-resonator with a variable superconducting
electrode capacitor bank for application in wireless power transfer
• Authors: Yingda He; Yu Wang Zhongming Yan
First page: 12LT02
Abstract: The frequency alignment of resonators is essential for wireless power transfer (WPT) systems to achieve strongly coupled magnetic resonances. Here, we present a novel tunable superconducting resonator for WPT applications. The tunable resonator is composed of a high-temperature superconducting (HTS) coil and a variable HTS electrode capacitor bank based on two series YBa 2 C 3 O 7− x –SrTiO 3 –YBa 2 C 3 O 7− x thin films. The HTS coil serves as a wireless transmitting tool for power delivery, while the HTS electrode capacitor bank provides a frequency-tuning element for the resonator. At 77 K, the HTS materials cause low loss and thus achieve a high quality factor, while the incipient ferroelectric SrTiO 3 substrate with HTS electrodes has a nonlinear capacitance dependence on the applied electric field with no hysteresis. A voltage supply applies a continuous DC bias to both capacitors synch...
Citation: Superconductor Science and Technology
PubDate: 2019-11-04T00:00:00Z
DOI: 10.1088/1361-6668/ab4c1d
Issue No: Vol. 32, No. 12 (2019)

• Recent advances in high-throughput superconductivity research
• Authors: Jie Yuan; Valentin Stanev, Chen Gao, Ichiro Takeuchi Kui Jin
First page: 123001
Abstract: Applications are being found for superconducting materials in a rapidly growing number of technological areas, and the search for novel superconductors remains a major scientific task. However, the steady increase in the complexity of candidate materials presents a big challenge to researchers. In particular, conventional experimental methods are not well suited to an efficient search for candidates in a compositional space growing exponentially with the number of elements; neither do they permit a quick extraction of reliable multidimensional phase diagrams delineating the physical parameters that control superconductivity. New research paradigms that can boost the speed and the efficiency of research into superconducting materials are urgently needed. High-throughput methods for the rapid screening and optimization of materials have aided the acceleration of research in bioinformatics and the pharmaceutical industry, yet remain rare in quantum materials research. In this paper...
Citation: Superconductor Science and Technology
PubDate: 2019-11-13T00:00:00Z
DOI: 10.1088/1361-6668/ab51b1
Issue No: Vol. 32, No. 12 (2019)

• Ta, Ti and Hf effects on Nb 3 Sn high-field performance:
temperature-dependent dopant occupancy and failure of Kramer
extrapolation
• Authors: Chiara Tarantini; Shreyas Balachandran, Steve M Heald, Peter J Lee, Nawaraj Paudel, Eun Sang Choi, William L Starch David C Larbalestier
First page: 124003
Abstract: The increasing demand for improving the high-field (16–22 T) performance of Nb 3 Sn conductors requires a better understanding of the properties of modern wires much closer to irreversibility field, H Irr . In this study we investigated the impact of Ta, Ti and Hf doping on the high-field pinning properties, the upper critical field, H c2 , and H Irr . We found that the pinning force curves of commercial Ti and Ta doped wires at different temperatures do not scale and that the Kramer extrapolation from low field data, typically used by magnet designers to estimate high-field critical current density and magnet operational margins, is not reliable and significantly overestimates the actual H Irr . In contrast, new laboratory scale conductors made with Nb–Ta–Hf alloy have improved high-field J c performance and, despite contributions by both grain boun...
Citation: Superconductor Science and Technology
PubDate: 2019-11-04T00:00:00Z
DOI: 10.1088/1361-6668/ab4d9e
Issue No: Vol. 32, No. 12 (2019)

• Energy-resolved neutron imaging with high spatial resolution using a
superconducting delay-line kinetic inductance detector
• Authors: Yuki Iizawa; Hiroaki Shishido, Kazuma Nishimura, The Dang Vu, Kenji M Kojima, Tomio Koyama, Kenichi Oikawa, Masahide Harada, Shigeyuki Miyajima, Mutsuo Hidaka, Takayuki Oku, Kazuhiko Soyama, Kazuya Aizawa, Soh Y Suzuki Takekazu Ishida
First page: 125009
Abstract: Neutron imaging is one of the key technologies for non-destructive transmission testing. Recent progress in the development of intensive neutron sources allows us to perform energy-resolved neutron imaging with high spatial resolution. Substantial efforts have been devoted to developing a high spatial and temporal resolution neutron imager. We have been developing a neutron imager aiming at conducting high spatial and temporal resolution imaging based on a delay-line neutron detector, called the current-biased kinetic-inductance detector, with a conversion layer 10 B. The detector allowed us to obtain a neutron transmission image with four signal readout lines. Herein, we expanded the sensor active area, and improved the spatial resolution of the detector. We examined the capability of high spatial resolution neutron imaging over the sensor active area of 15 × 15 mm 2 for various samples, including biological and metal ones. We also demonstrated an energy-res...
Citation: Superconductor Science and Technology
PubDate: 2019-11-04T00:00:00Z
DOI: 10.1088/1361-6668/ab4e5c
Issue No: Vol. 32, No. 12 (2019)

• Electromagnetic strain measurements and two-directional mechanical stress
estimation for a REBaCuO ring bulk reinforced by a metal ring during
field-cooled magnetization
• Authors: Sora Namba; Hiroyuki Fujishiro, Tomoyuki Naito, Mark D Ainslie Kai Y Huang
First page: 125011
Abstract: In this paper, simultaneous measurements of the electromagnetic strains along both the circumferential ( θ ) and radial ( r ) directions are reported for a large single-grain EuBaCuO ring bulk reinforced by an Al alloy ring during field-cooled magnetization (FCM) from 5 T at 50 K using several strain gauges adhered to the surface. To verify the experimental results and to understand the complex stress–strain behavior, mechanical analyses were carried out using a three-dimensional finite element model that closely represents the experimental setup. The simulation results of the electromagnetic strains along both directions showed excellent qualitative and quantitative agreement with the experimental ones. These results strongly suggest that the numerical model must include the exact same structure (size, shape and materials) of the mechanical support structure as the experimental setup in order to reproduce the experimental results both qualitatively as well as quantita...
Citation: Superconductor Science and Technology
PubDate: 2019-11-04T00:00:00Z
DOI: 10.1088/1361-6668/ab4a8b
Issue No: Vol. 32, No. 12 (2019)

• Microwave antenna properties of an optically triggered superconducting
ring
• Authors: T J Bullard; J Bulmer, J Murphy, M Ferdinandus, J M Reed, T Kent, C L Eakins, D Latypov, C Ebbing, A Urbas, M Sparkes, W O’Neill T Haugan
First page: 125012
Abstract: We examine the microwave radiation emitted from inductively charged centimeter-scale YBCO (YBa 2 Cu 3 O 7- δ ) annular rings illuminated with a 45 fs, 790 nm laser pulse. The electromagnetic radiation from the rings shows the following behavior. (1) Radiation emitted perpendicular to the plane of the ring is polarized parallel to the plane of the ring and across the point of illumination. (2) The in-plane radiation pattern resembles that of a loop antenna with the orientation of the pattern determined by the location of the illumination point. (3) The dominant frequency of the emitted radiation shows an inverse dependence on the ring diameter. (4) The emitted energy is proportional to energy stored in the ring for a number of different geometries, with thinner films displaying a higher efficiency. Finally, (5) the emitted energy grows exponentially with small laser pulse energy values and approaches saturation for higher energies. These results ...
Citation: Superconductor Science and Technology
PubDate: 2019-11-04T00:00:00Z
DOI: 10.1088/1361-6668/ab48ce
Issue No: Vol. 32, No. 12 (2019)

• High- T c superconductivity in H 3 S: pressure effects on the
superconducting critical temperature and Cooper pair distribution
function
• Authors: J A Camargo-Martínez; G I González-Pedreros R Baquero
First page: 125013
Abstract: We use first-principles calculations to study the effects of pressure on the vibrational and superconducting properties of H 3 S in the cubic ##IMG## [http://ej.iop.org/images/0953-2048/32/12/125013/sustab4ff9ieqn1.gif] {${Im}\bar{3}m$} phase for the pressure range where the superconducting critical temperature ( T c ) was measured (155–225 GPa). The pressure effects were incorporated using the functional derivative method (FDM). In this paper we present for the first time the Cooper pair distribution functions D cp ( ω , T c ) for H 3 S, which will allow us to identify the spectral regions where Cooper pair formation at temperature T c is more favorable. We analyze in detail the effects of pressure on the electron–phonon spectral density function α 2 F ( ω ) and the phonon density of states and their relationship with T c
Citation: Superconductor Science and Technology
PubDate: 2019-11-06T00:00:00Z
DOI: 10.1088/1361-6668/ab4ff9
Issue No: Vol. 32, No. 12 (2019)

• c -axis superconducting performance enhancement in Co-doped Ba122 thin
films by an artificial pinning center design
• Authors: Zhongtang Xu; Qinghua Zhang, Fan Fan, Lin Gu Yanwei Ma
First page: 125014
Abstract: 1% mol and 3% mol Y 2 O 3 oxide particles were introduced into Co-doped BaFe 2 As 2 (Ba122) thin films on CaF 2 (00 l ) single crystal substrates by pulsed laser deposition to enhance the superconducting performance. They behave as amorphous nanorods oriented along the c -axis of the Co-doped Ba122 matrix, as revealed by the transmission electron microscope (TEM) measurements, and serve as strong c -axis pinning centers. The transport critical current density J c reaches a value of ∼3.9 MA cm −2 in self-field at 4.2 K and a significant enhancement in c -axis J c , much higher than the ab -plane J c , was also observed due to those nanorods, suggesting that the extrinsic pinning strength by nanorods exceeds that of the ab -plane. It is surprising that the nanorods can significantly improve the thermal activation energies for vortex motio...
Citation: Superconductor Science and Technology
PubDate: 2019-11-06T00:00:00Z
DOI: 10.1088/1361-6668/ab4f44
Issue No: Vol. 32, No. 12 (2019)

• Competition between pinning produced by extrinsic random point disorder
and superconducting thermal fluctuations in oxygen-deficient GdBa 2 Cu 3
O x coated conductors
• Authors: N Haberkorn; J Guimpel, S Suárez, Jae-Hun Lee, Hunju Lee S H Moon
First page: 125015
Abstract: We report on the influence of random point defects introduced by 3 MeV proton irradiation on the vortex dynamics of 1.3 μ m thick GdBa 2 Cu 3 O x coated conductors. Thin films with different oxygen stoichiometry (6.7
Citation: Superconductor Science and Technology
PubDate: 2019-11-13T00:00:00Z
DOI: 10.1088/1361-6668/ab5164
Issue No: Vol. 32, No. 12 (2019)

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