Details of the Superconducting Phase Transition in Nb Showing the Paramagnetic Meissner Effect

Author(s):  
L. P?st ◽  
L.E. Wenger ◽  
M.R. Koblischka
1987 ◽  
Vol 2 (5) ◽  
pp. 543-546 ◽  
Author(s):  
W. S. Millman ◽  
M. Ulla ◽  
Zhilan Han ◽  
M. Maclaurin ◽  
B. P. Tonner

Microscopy and x-ray emission analysis have been performed on Y–Ba–Cu–O superconductors as a function of temperature using a scanning electron microscope equipped with a low-temperature stage. The samples exhibit a superconducting phase transition above liquid nitrogen temperature as determined by resistivity measurements and a demonstrated Meissner effect. Strong contrast changes in the micrographs due to the superconducting phase transition are found, which have been used to identify normal and superconducting regions of the sample. These samples are found to consist of particles with superconducting shells surrounding a nonsuperconducting core.


1999 ◽  
Vol 82 (22) ◽  
pp. 4532-4535 ◽  
Author(s):  
P. Kumar ◽  
Donavan Hall ◽  
R. G. Goodrich

1990 ◽  
Vol 42 (4) ◽  
pp. 1422-1431 ◽  
Author(s):  
H. Chen ◽  
J. R. Brownstein ◽  
D. J. Rowe

2001 ◽  
Vol 16 (17) ◽  
pp. 1129-1138 ◽  
Author(s):  
M. SADZIKOWSKI

The Nambu–Bogoliubov–de Gennes method is applied to the problem of superconducting QCD. The effective quark–quark interaction is described within the framework of the Nambu–Jona-Lasinio model. The details of the phase diagram are given as a function of the strength of the quark–quark coupling constant G′. It is found that there is no superconducting phase transition when one uses the relation between the coupling constants G′ and G of the Nambu–Jona-Lasinio model which follows from the Fierz transformation. However, for other values of G′ one can find a rich phase structure containing both the chiral and the superconducting phase transitions.


1991 ◽  
Vol 44 (13) ◽  
pp. 7081-7084 ◽  
Author(s):  
H. R. Ott ◽  
E. Felder ◽  
Z. Fisk ◽  
R. H. Heffner ◽  
J. L. Smith

1995 ◽  
Vol 43 (8) ◽  
pp. 697-732 ◽  
Author(s):  
Michael Kiometzis ◽  
Hagen Kleinert ◽  
Adriaan M. J. Schakel

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