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Low Temperature Physics
Journal Prestige (SJR): 0.264

Citation Impact (citeScore): 1
Number of Followers: 5

Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1063-777X - ISSN (Online) 1090-6517
Published by AIP

[28 journals]

Hydrogen in superconductors (Review article)
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  Pages: 597 - 652
  Abstract: Information on the state of research on the effect of hydrogen on the superconducting properties of various compounds is presented. The review consists of an introduction, one appendix and four sections: methods for the synthesis of modern hydrogen-containing superconductors, experimental studies of the properties of hydrogen-containing superconductors, mechanisms of the influence of hydrogen on superconductivity, problems and prospects of hydrogen-containing superconductors.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027919
  Issue No: Vol. 50, No. 8 (2024)
IV International Workshop on Point-Contact Spectroscopy (PCS-2024) March
25–28, 2024 (Kharkiv, Ukraine)
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  Pages: 653 - 654
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027920
  Issue No: Vol. 50, No. 8 (2024)
Point-contact spectroscopy of Leggett modes in superconducting compounds
with unconventional pairing
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  Pages: 655 - 662
  Abstract: Proximity-coupled nanostructures of conventional superconductors (SCs) and half-metallic ferromagnets (hmFs) are promising candidates as materials with unconventional superconductivity. The interrelated superposition of spin singlet-triplet and frequency even-odd superconducting condensates characterizes the superconducting state in such heterostructures. In a multi-band SC, the collective modes associated with the excitations of the relative phase between superconducting bands without perturbation of the Cooper pairs symmetry (Leggett modes) are allowed. In this report, we present the results of experimental investigations via the point-contact transport measurements of the Leggett-like collective excitations in the superconducting state of the nanocomposite of s-wave two-band superconductor MgB2 and half-metallic ferromagnet (La,Sr)MnO3. Two types of point contacts (PCs) have been used: the nanocomposite-nonmagnetic metal PCs and the nanocomposite–hmF PCs. The conductance equidistant peaks against the background of the gap structure were observed in both types of high-quality point junctions. Their distinctive feature was their period: two times shorter for the nanocomposite–hmF contacts compared to the nonmagnetic metal PCs. We attribute these spin-selective conductance periodic peaks to the relative phase Leggett’s excitations between “parents” MgB2 even-frequency singlet condensates and proximity-induced triplet superconducting condensates. The data obtained on the hmF PCs also demonstrate the features that may indicate a dynamic coupling between even-frequency condensates and odd-frequency gapless superconducting condensates.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027921
  Issue No: Vol. 50, No. 8 (2024)
Superconductivity in TiZrNb and TiZrNbHf bulk equimolar alloys
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  Pages: 663 - 667
  Abstract: We have prepared and investigated superconducting equimolar medium-entropy alloys of TiZrNb and TiZrNbHf. Their basic superconducting parameters, as the values of the critical temperature Tc, upper critical magnetic field Bc2 and the superconducting energy gap Δ have been studied with the use of magnetic susceptibility and point-contact Andreev reflection (PCAR) spectroscopy measurements. Although our samples have different critical temperatures, namely Tc ∼ 8.2 K for TiZrNb and Tc ∼ 6.3 K for TiZrNbHf, their zero-temperature critical magnetic field has the same value Bc2(0) = 12 T, from the vicinity of the Clogston limit. We have observed the presence of degraded phases on the surfaces of all the investigated samples using PCAR measurements. Still, we were able to show that the bulk phase in both systems exhibits BCS weakly coupled superconductivity with 2Δ(0)/kBTc ∼ 3.5.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027922
  Issue No: Vol. 50, No. 8 (2024)
Evidence of the inverse proximity effect in tunnel magnetic josephson
junctions
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  Pages: 668 - 675
  Abstract: Magnetic Josephson junctions (MJJs) are a special class of hybrid systems where antagonistic correlations coexist, thus providing a key for advances in weak superconductivity, superconducting spintronics, and quantum computation. So far, the memory properties of MJJs have been mostly investigated in view of digital electronics and for spintronic devices at liquid-helium temperature. At the operating temperature of quantum circuits, a magnetic order can rise in a superconductor (S) at the S/ferromagnet (F) interface, i.e., the inverse proximity effect (IPE), thus leading to a significant modification of the magnetic field patterns in MJJs. In this work, we have carried out a comparative investigation of the magnetic behavior of tunnel MJJs with a strong ferromagnetic layer inserted in the layout of both Nb and Al JJs, respectively. The comparative analysis validates the crucial role of the temperature, the fundamental scaling energies of S/F coupling systems, and the transparency of the S/F interface. This investigation points out that the IPE is a key aspect to consider when designing tunnel MJJs operating well below 4 K and thus in the perspective of hybrid superconducting quantum architectures.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027923
  Issue No: Vol. 50, No. 8 (2024)
Electron-phonon interaction, magnetic phase transition, charge density
waves, and resistive switching in VS 2 and VSe 2 revealed by Yanson
point-contact spectroscopy
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  Pages: 676 - 682
  Abstract: VS2 and VSe2 have attracted particular attention among the transition metals dichalcogenides because of their promising physical properties concerning magnetic ordering, charge density wave (CDW), emergent superconductivity, etc., which are very sensitive to stoichiometry and dimensionality reduction. Yanson point-contact (PC) spectroscopic study reveals metallic and nonmetallic states in VS2 PCs, as well as a magnetic phase transition, was detected near 20 K. The rare PC spectra, where the magnetic phase transition was not visible, show a broad maximum of around 20 mV, likely connected with electron-phonon interaction (EPI). The PC spectra of VSe2 demonstrate metallic behavior, which allowed us to detect features associated with EPI and CDW transition. The Kondo effect appeared for both compounds, apparently due to interlayer vanadium ions. Besides, the resistive switching was observed in PCs on VSe2 between a low resistive, mainly metallic-type state, and a high resistive nonmetallic-type state by applying bias voltage (about 0.4 V). Reverse switching occurs by applying a voltage of opposite polarity (about 0.4 V). The reason may be the alteration of stoichiometry in the PC core due to the displacement of V ions to interlayer under a high electric field. The observed resistive switching characterizes VSe2 as a potential material, e.g., for non-volatile resistive RAM, neuromorphic engineering, and other nanoelectronic applications. Per contra, VS2 attracts attention as a rare layered van der Waals compound with magnetic transition.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027924
  Issue No: Vol. 50, No. 8 (2024)
Contact and bulk rectification effects in ferromagnetic resonance
experiments
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  Pages: 683 - 687
  Abstract: We present an experimental study of the spin rectification effects produced by ferromagnetic resonance in a NiFe wire. A system of four independent nonmagnetic contact probes was used to supply both rf and dc currents to the wire and to measure dc voltages at different locations in the wire. The rf current drives the ferromagnet’s magnetization into resonance and produces a dc photovoltage which results from the rectification of rf current in the ferromagnet with oscillating magnetization. Our 4-probe system provided a means to detect the photovoltage and separate contributions from the ferromagnet/nonmagnet contacts and the bulk of the ferromagnet. The contact photovoltage was found to increase approximately linearly with the dc bias applied to the wire. In contrast, the bulk contribution was found to be almost independent of the dc bias. By tuning properties of individual contact probes we were able to change the magnitude of the contact photovoltage and even reverse its sign. Our results highlight the different contributions to photovoltage and the importance of contact properties/nonlinearities for rectification effects in spintronic devices.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027925
  Issue No: Vol. 50, No. 8 (2024)
Two-phase/two-gap scenario in heavily reduced superconducting ITO films
revealed by point-contact spectroscopy
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  Pages: 688 - 692
  Abstract: We present the first point-contact measurements of heavily reduced indium tin oxide (ITO) films in the superconducting state, which simultaneously demonstrate high transparency in the visible light spectrum. Analysis of the differential conductance spectrum indicates the presence of two superconducting phases, the main one with a critical temperature Tc of about 4.6 K and an additional phase with Tc ∼ 10 K, most likely localized near the surface. The phase separation is indirectly confirmed by resistance measurements of the layers and ab initio calculations of the doped ITO electronic structure. The results obtained give hope for the creation of transparent superconducting films with critical temperatures of about 10 K.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027926
  Issue No: Vol. 50, No. 8 (2024)
Josephson tunneling controlled by spin-orbit interaction
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  Pages: 693 - 699
  Abstract: On the occasion of the 50th anniversary of point-contact spectroscopy, we review and extend some of our recent studies on the effects of spin-orbit interactions located at an electric point contact connecting two bulk superconductors. In particular, we study the effects on the Josephson tunneling of Cooper pairs between the superconductors. We demonstrate that such tunneling forces the electronic spin to fluctuate quantum mechanically, transforming a BCS condensate into a quantum superposition of singlet and triplet pairs. The relative prevalence of those pairs can be controlled electrostatically and mechanically. The singlet pairs contribute to the Josephson charge current flowing through the point contact but not to the Josephson spin current injected into the superconductors. The spin-polarized pairs contribute to the injected Josephson spin current but not to the superconducting charge flow. These results allow for new functionalities of spin-active Josephson junctions.
  PubDate: Thu, 01 Aug 2024 00:00:00 GMT
  DOI: 10.1063/10.0027927
  Issue No: Vol. 50, No. 8 (2024)

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