scholarly journals Динамическая восприимчивость нанокомпозита пористое стекло/Ga-In-Sn в области сверхпроводимости

2022 ◽  
Vol 64 (1) ◽  
pp. 40
Author(s):  
О.Д. Шевцова ◽  
М.В. Лихолетова ◽  
Е.В. Чарная ◽  
Е.В. Шевченко ◽  
Ю.А. Кумзеров ◽  
...  
Keyword(s):  
Proximity Effect ◽  
Positive Curvature ◽  
Ac Susceptibility ◽  
Superconducting Phase ◽  
Self Healing ◽  
Activation Barriers ◽  
Nanostructured Alloys ◽  
Effect Model ◽  
Gallium Alloys ◽  
Critical Lines

Interest to studies of gallium alloys increased recently in relation to their prospective applications for self-healing superconducting connections and wires. Special attention is focused on superconductive properties of nanostructured alloys. In the present work we studied the ac susceptibility of a porous glass/Ga-In-Sn nanocomposite within the temperature range from 1.9 to 8 K at bias fields up to 5 T. Two superconducting phase transitions were revealed with temperatures of 5.6 and 3.1 K. Phase diagrams were created. Positive curvature of the parts of critical lines was demonstrated and treated within the framework of a proximity effect model. Vortex activation barriers were found from shifts of the maxima of the imaginary parts of susceptibility with changing the ac frequency. A bend was shown on the field dependence of the activation barriers.

scholarly journals Сверхпроводимость эвтектического сплава Bi-Sn

2021 ◽  
Vol 63 (2) ◽  
pp. 208
Author(s):  
М.В. Лихолетова ◽  
Е.В. Чарная ◽  
Е.В. Шевченко ◽  
Ю.А. Кумзеров
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Magnetic Fields ◽  
Field Dependence ◽  
Proximity Effect ◽  
Coherence Length ◽  
Eutectic Composition ◽  
Positive Curvature ◽  
Two Stage ◽  
Effect Model

We present results of studies of superconductivity in a binary Bi-Sn alloy of the eutectic composition (57 wt.% Bi, 43 wt.% Sn). Temperature and field dependences of the dc magnetization were measured within a temperature range from 1.8 to 20 K in magnetic fields up to 20 kOe using a Quantum Design MPMS3 SQUID magnetometer. A two-stage phase transition with temperatures of the diamagnetism onset of 8.55 and 5.1 K was observed. A phase diagram was constructed. The coherence length for the first stage was estimated. The field dependence of the irreversibility temperature was found. Critical dependencies showed a positive curvature which was treated within the framework of the proximity effect model.

scholarly journals Generalized proximity effect model in superconducting bi- and trilayer films

2001 ◽  
Vol 90 (1) ◽  
pp. 355-364 ◽  
Author(s):  
G. Brammertz ◽  
A. Poelaert ◽  
A. A. Golubov ◽  
P. Verhoeve ◽  
A. Peacock ◽  
...  
Keyword(s):  
Proximity Effect ◽  
Effect Model

STABILIZATION OF Bi(2223) SUPERCONDUCTING PHASE BY VANADIUM OXIDE ADDITION

1993 ◽  
Vol 07 (01n03) ◽  
pp. 157-161 ◽  
Author(s):  
D. SURESH BABU ◽  
G. NARSING RAO ◽  
L. BROHAN ◽  
M. GANNE
Keyword(s):  
Critical Current Density ◽  
Current Density ◽  
Flux Pinning ◽  
Volume Fraction ◽  
Ac Susceptibility ◽  
Superconducting Phase ◽  
Nominal Composition ◽  
Oxide Addition ◽  
Probable Role

We report on the ac susceptibility, microwave absorption and dc magnetization of Bi 2− x V x Sr 2 Ca 2 Cu 3 O y (nominal composition). The low T c (2212) phase ( T c = 85 K ) dominates in the x = 0 sample with extremly weak flux pinning. In x = 0.4 sample, both flux pinning and volume fraction of the high T c (2223) phase ( T c = 105 K ) were increased. The intragrain critical current density of the sample with x = 0.4 was estimated and found to be comparable with that of Pb doped Bi 2 Sr 2 Ca 2 Cu 3 O y superconductor. The data suggest that addition of V 2 O 5 in Bi 2 Sr 2 Ca 2 Cu 3 O y system increases the volume fraction of the high T c phase. Probable role of vanadium in enhancing the high T c (2223) phase in Bi-V-Sr-Ca-Cu-O system is discussed.

scholarly journals Proximity-effect-induced superconducting phase in the topological insulator Bi2Se3

2012 ◽  
Vol 86 (13) ◽  
Author(s):  
Fan Yang ◽  
Fanming Qu ◽  
Jie Shen ◽  
Yue Ding ◽  
Jun Chen ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Proximity Effect ◽  
Superconducting Phase

Ac susceptibility studies of a superconducting gallium nanocomposite: Crossover in the upper critical field line and activation barriers

2013 ◽  
Vol 113 (11) ◽  
pp. 113903 ◽  
Author(s):  
M. K. Lee ◽  
E. V. Charnaya ◽  
Cheng Tien ◽  
L. J. Chang ◽  
Yu. A. Kumzerov
Keyword(s):  
Field Line ◽  
Critical Field ◽  
Ac Susceptibility ◽  
Upper Critical Field ◽  
Activation Barriers

Specific heat and ac susceptibility studies of the superconducting phase diagram ofPrOs4Sb12

2006 ◽  
Vol 73 (10) ◽  
Author(s):  
K. Grube ◽  
S. Drobnik ◽  
C. Pfleiderer ◽  
H. v. Löhneysen ◽  
E. D. Bauer ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Specific Heat ◽  
Ac Susceptibility ◽  
Superconducting Phase

A proximity effect model for superconductivity in titanium-transition metal alloys

1981 ◽  
Vol 43 (3-4) ◽  
pp. 341-352 ◽  
Author(s):  
Y. Hariharan ◽  
M. C. Valsakumar ◽  
T. S. Radhakrishnan
Keyword(s):  
Transition Metal ◽  
Proximity Effect ◽  
Metal Alloys ◽  
Transition Metal Alloys ◽  
Effect Model

scholarly journals Proximity effect model of ultranarrow NbN strips

2017 ◽  
Vol 96 (18) ◽  
Author(s):  
I. Charaev ◽  
T. Silbernagel ◽  
B. Bachowsky ◽  
A. Kuzmin ◽  
S. Doerner ◽  
...  
Keyword(s):  
Proximity Effect ◽  
Effect Model
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