Transition temperature and specific heat jump of a proximity effect sandwich containing local spin fluctuations

1985 ◽  
Vol 59 (3-4) ◽  
pp. 383-393
Author(s):  
I. M. Tang ◽  
S. Ratanapan
Keyword(s):  
Transition Temperature ◽  
Specific Heat ◽  
Proximity Effect ◽  
Spin Fluctuations ◽  
Local Spin ◽  
Specific Heat Jump

Proximity effect sandwiches containing local spin fluctuations

1984 ◽  
Vol 56 (5-6) ◽  
pp. 441-460 ◽  
Author(s):  
I. M. Tang ◽  
S. Roongkeadsakoon
Keyword(s):  
Proximity Effect ◽  
Spin Fluctuations ◽  
Local Spin

Specific heat jump in non-Fermi superconductors

1998 ◽  
Vol 4 (2) ◽  
pp. 175-178 ◽  
Author(s):  
I. Tifrea ◽  
M. Crisan
Keyword(s):  
Specific Heat ◽  
Specific Heat Jump

Upper bound on the specific-heat jump: Application to the high-Tcoxides

1987 ◽  
Vol 36 (7) ◽  
pp. 3622-3626 ◽  
Author(s):  
J. Blezius ◽  
J. P. Carbotte
Keyword(s):  
Specific Heat ◽  
Upper Bound ◽  
Specific Heat Jump

EFFECT OF COOLING RATE ON THE TRANSITION TEMPERATURE IN Bi–Pb–Sr–Ca–Cu–O SYSTEM

1990 ◽  
Vol 04 (04) ◽  
pp. 293-299
Author(s):  
YUGUI WANG ◽  
JINSONG WANG ◽  
NANLIN WANG ◽  
XINPING JIAO ◽  
GUCHANG HAN ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Specific Heat ◽  
Cooling Rate ◽  
Volume Fraction ◽  
Oxygen Deficiency ◽  
Ac Susceptibility ◽  
Rapid Quenching ◽  
Nominal Composition ◽  
Unit Cell Size ◽  
Superconducting Volume Fraction

The resistance and ac susceptibility measurements show that cooling rate of the cast-annealing samples in heat treatment process has some effect on the 110 K superconducting phase in Bi–Pb–Sr–Ca–Cu–O system. Rapid quenching of the sample in air from 845°C causes oxygen deficiency in lattice and brings about a trifling change of unit cell size along c-axis direction. The dc magnetization and specific heat anomaly ∆c measurements demonstrate that fast cooling rate can reduce the transition temperature of high T c phase and the lower critical field, and weaken the pinning forces for vertex lines. The peak value of specific heat anomaly of the sample with nominal composition of Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 4.5 O y is still small in comparison with YBa 2 Cu 3 O 7. From the magnetization curve we can estimate that the superconducting volume fraction is about 20%.

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