scholarly journals Non-S-Wave Pairing Symmetries in Superconducting in and Sn Nanoparticles

2021 ◽  
Author(s):  
Ma-Hsuan Ma ◽  
Erdembayalag Batsaikhan ◽  
Huang-Nan Chen ◽  
Ting-Yang Chen ◽  
Chi-Hung Lee ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Weak Field ◽  
Critical Magnetic Field ◽  
Superconducting Transition ◽  
S Wave ◽  
The Core ◽  
Wave Pairing ◽  
Pairing Symmetries ◽  
Higher Temperature ◽  
Sn Nanoparticle

Abstract We report on experimental evidence of non-s-wave pairing in In and Sn nanoparticle assemblies. Spontaneous magnetizations are observed, through extremely weak-field magnetization and neutron-diffraction measurements, to develop when the nanoparticles enter the superconducting state. The superconducting transition temperature TC shifts to a noticeably higher temperature when an external magnetic field or magnetic Ni nanoparticles are introduced into the vicinity of the superconducting In or Sn nanoparticles. There is a critical magnetic field and a critical Ni composition that must be reached before the magnetic environment will suppress the superconductivity. Development of spin-parallel superconducting pairs on the surfaces and spin-antiparallel superconducting pairs in the core of the nanoparticles is used to understand the observations.

scholarly journals Non-conventional superconductivity in magnetic In and Sn nanoparticles

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Ma-Hsuan Ma ◽  
Erdembayalag Batsaikhan ◽  
Huang-Nan Chen ◽  
Ting-Yang Chen ◽  
Chi-Hung Lee ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Weak Field ◽  
Critical Magnetic Field ◽  
Superconducting Transition ◽  
Ni Nanoparticles ◽  
Nanoparticle Assemblies ◽  
The Core ◽  
Higher Temperature ◽  
Sn Nanoparticle

AbstractWe report on experimental evidence of non-conversional pairing in In and Sn nanoparticle assemblies. Spontaneous magnetizations are observed, through extremely weak-field magnetization and neutron-diffraction measurements, to develop when the nanoparticles enter the superconducting state. The superconducting transition temperature TC shifts to a noticeably higher temperature when an external magnetic field or magnetic Ni nanoparticles are introduced into the vicinity of the superconducting In or Sn nanoparticles. There is a critical magnetic field and a critical Ni composition that must be reached before the magnetic environment will suppress the superconductivity. The observations may be understood when assuming development of spin-parallel superconducting pairs on the surfaces and spin-antiparallel superconducting pairs in the core of the nanoparticles.

THE SUPERCONDUCTING STATE OF A SINGULAR FERMI LIQUID IN A MAGNETIC FIELD

2004 ◽  
Vol 18 (31n32) ◽  
pp. 4143-4159 ◽  
Author(s):  
MATEUSZ KRZYZOSIAK ◽  
RYSZARD GONCZAREK
Keyword(s):  
Magnetic Field ◽  
Fermi Liquid ◽  
Degrees Of Freedom ◽  
Scattering Amplitude ◽  
Critical Magnetic Field ◽  
S Wave ◽  
Magnetic Field Penetration Depth ◽  
Magnetic Field Penetration ◽  
The Magnetic Field ◽  
Field Penetration Depth

Model of a superconducting singular Fermi liquid with a divergent scattering amplitude for particles with the same momenta has been extended by the inclusion of an external magnetic field. Pseudogap-like behavior observed in the model is interpreted. The response of the system to a weak magnetic field acting on both: spin and charge degrees of freedom is studied within the Bogolubov method. The magnetization and the magnetic field penetration depth as well as the critical magnetic field and the critical current are found and discussed. Numerical results for a s-wave paired singular Fermi liquid are presented.

scholarly journals The upper critical magnetic field of holographic superconductor with conformally invariant Power–Maxwell electrodynamics

2017 ◽  
Vol 95 (5) ◽  
pp. 450-456 ◽  
Author(s):  
A. Sheykhi ◽  
F. Shamsi ◽  
S. Davatolhagh
Keyword(s):  
Magnetic Field ◽  
Phase Behavior ◽  
Critical Magnetic Field ◽  
Power Exponent ◽  
S Wave ◽  
Holographic Superconductor ◽  
Intermediate Point ◽  
Conformally Invariant ◽  
Upper Critical Magnetic Field ◽  
Maxwell Electrodynamics

The properties of (d–1)-dimensional s-wave holographic superconductor in the presence of Power–Maxwell field is explored. We study the probe limit in which the scalar and gauge fields do not backreact on the background geometry. Our study is based on the matching of solutions on the boundary and on the horizon at some intermediate point. At first, the case without external magnetic field is considered, and the critical temperature is obtained in terms of the charge density, the dimensionality, and the Power–Maxwell exponent. Then, a magnetic field is turned on in the d-dimensional bulk, which can influence the (d–1)-dimensional holographic superconductor at the boundary. The phase behavior of the corresponding holographic superconductor is obtained by computing the upper critical magnetic field in the presence of Power–Maxwell electrodynamics, characterized by the power exponent q. Interestingly, it is observed that in the presence of a magnetic field, the physically acceptable phase behavior of the holographic superconductor is obtained for q = d/4, which guaranties the conformal invariance of the Power–Maxwell Lagrangian. The case of physical interest in five space–time dimensions (d = 5, and q = 5/4) is considered in detail, and compared with the results obtained for the usual Maxwell electrodynamics q = 1 in the same dimensions.

CRITICAL MAGNETIC FIELD IN CeCoIn5 SUPERCONDUCTOR

2005 ◽  
Vol 19 (20) ◽  
pp. 3243-3248
Author(s):  
JE HUAN KOO ◽  
DOH-HYUN GILL ◽  
GUANGSUP CHO
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Transition Temperature ◽  
External Magnetic Field ◽  
Temperature Gradient ◽  
Critical Magnetic Field ◽  
Spin Fluctuations ◽  
Superconducting Transition ◽  
Good Correspondence ◽  
The Magnetic Field

We investigate the superconducting transition temperature, Tc in the presence of the magnetic field, H in CeCoIn 5. It is shown that phonon-enhanced spin fluctuations drive this superconductivity once more as suggested by us (Phys. Rev.B61, 4289). We know the magnetic dependence of our transition temperature is in good correspondence with experimental data. It is elucidated that the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) superconducting states are closely related to the temperature gradient contributed by the external magnetic field.

scholarly journals Размерные зависимости магнитных свойств сверхпроводящих наноструктур свинца в пористом стекле

2018 ◽  
Vol 60 (6) ◽  
pp. 1058
Author(s):  
Н.Ю. Михайлин ◽  
Д.В. Шамшур ◽  
Р.В. Парфеньев ◽  
В.И. Козуб ◽  
Ю.М. Гальперин ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
Low Temperature ◽  
Porous Glass ◽  
Magnetic Moment ◽  
Glass Matrix ◽  
Critical Magnetic Field ◽  
Superconducting Transition ◽  
Qualitative Model ◽  
Flux Jumps

AbstractSuperconducting structures Pb–PG formed by filling a porous glass matrix with the lead from melt under pressure have been investigated. Samples with characteristic pore structure diameters of d ≈ 7, 3, and 2 nm have been studied. It has been found that the critical temperature of the superconducting transition in the samples under study is similar to the corresponding value T _ c ≈ 7.2 K for bulk lead. At the same time, it has been observed that the critical magnetic field of the nanocomposites, which attains H _ c ( T = 0 K) ≈ 165 kOe for Pb–PG (3 nm), exceeds several times the value H _ c (0) = 803 Oe for bulk lead. The low-temperature magnetic- field dependences of magnetic moment M ( H ) contain quasi-periodic flux jumps, which vanish with a decrease in the lead nanostructure diameter. A qualitative model of the observed effects is considered.

Magnetic field necessary to destroy superconductivity in Al-type Se and Te

1978 ◽  
Vol 56 (9) ◽  
pp. 1133-1135 ◽  
Author(s):  
Carlo Reale
Keyword(s):  
Magnetic Field ◽  
Critical Field ◽  
Annealing Temperature ◽  
Bulk Material ◽  
Critical Magnetic Field ◽  
Normal Phase ◽  
Zero Field ◽  
Superconducting Transition ◽  
Cyclic Annealing ◽  
Glass Substrates

This paper reports the results of a study of the critical magnetic field required to restore electrical resistance in superconducting metastable Al-type Se and Te overlays vapor-quenched, respectively, on MgO, FeO, CoO, or NiO and CaO or MnO base films quench-condensed on glass substrates. The critical field was measured at various temperatures, from the superconducting transition temperature in zero field down to 0.1 K, for overlay thicknesses ranging from 100 Å up to values at which size effects disappear. The measurements were repeated after cyclic annealing at increasing temperatures up to a limiting temperature at which the overlay breaks owing to the transformation of the A1-type modification to the less dense ordinary A8-type structure.The critical field decreases steeply, with increasing thickness, down to a constant bulk-material value, increases nearly parabolically, with decreasing temperature, up to an extrapolable absolute-zero value, and decreases irreversibly with increasing annealing temperature. The superconducting-to-normal phase transition occurs through an intermediate state, which indicates that quench-deposited A1-type Se and Te are soft superconductors.

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