Pressure dependence of the superconducting transition temperature in single crystals ofTl2Ba2Ca2Cu3O10−x

1993 ◽  
Vol 47 (9) ◽  
pp. 5524-5527 ◽  
Author(s):  
D. D. Berkley ◽  
E. F. Skelton ◽  
N. E. Moulton ◽  
M. S. Osofsky ◽  
W. T. Lechter ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Single Crystals ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition

Pressure Dependence of Superconducting Transition Temperature Tc in a Series of Zn-Substituted YBa2Cu3-xZnxO7-δ Single Crystals: Effects of Pairing-Related Dynamic Processes Versus Static Lattice Modifications

1998 ◽  
Vol 12 (14n15) ◽  
pp. 589-596 ◽  
Author(s):  
Xiaohang Li ◽  
L. Lu ◽  
Shanlin Li ◽  
X. N. Jing ◽  
Zhang Dian-Lin ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Single Crystals ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Dynamic Processes ◽  
Superconducting Transition ◽  
Large Uncertainty ◽  
Pairing Mechanism ◽  
Absolute Value ◽  
Static Lattice

The pressure dependence of superconducting transition temperature Tc was investigated on single-crystal samples of Zn-substituted YBa 2 Cu 3-x Zn x O 7-δ. In contrast to previous measurements on polycrystalline samples where, because of the broad transition, large uncertainty exists in determining the detailed pressure dependence of Tc, our measurements revealed that adding Zn impurities only slightly enhances the dTc=dP (where P denotes the pressure). The absolute value of dT c =dP is small in the whole range of x investigated, despite of the dramatic depression of Tc upon the substitution. The results seem to demonstrate that the depression of T c , and hence the dynamic processes responsible for the pairing mechanism, are quite irrelevant to, or insensitive to the pressure-induced static lattice modifications.

scholarly journals Pressure dependence of superconducting-transition temperature of YbGa1.1Si0.9

2010 ◽  
Vol 215 ◽  
pp. 012035 ◽  
Author(s):  
A Ohmura ◽  
K Fujimaki ◽  
M Einaga ◽  
F Ishikawa ◽  
A Nakayama ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition

scholarly journals Research Progress on Ni-Based Antiperovskite Compounds

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
P. Tong ◽  
Y. P. Sun
Keyword(s):  
Phase Diagram ◽  
Transition Temperature ◽  
Single Crystals ◽  
Superconducting Transition Temperature ◽  
Spin Fluctuations ◽  
Research Progress ◽  
Future Research ◽  
Magnetic Element ◽  
Superconducting Transition ◽  
Cubic Structure

The superconductivity in antiperovskite compound MgCNi3was discovered in 2001 following the discovery of the superconducting MgB2. In spite of its lower superconducting transition temperature (8 K) than MgB2(39 K), MgCNi3has attracted considerable attention due to its high content of magnetic element Ni and the cubic structure analogous to the perovskite cuprates. After years of extensive investigations both theoretically and experimentally, however, it is still not clear whether the mechanism for superconductivity is conventional or not. The central issue is if and how the ferromagnetic spin fluctuations contribute to the cooper paring. Recently, the experimental results on the single crystals firstly reported in 2007 trend to indicate a conventionals-wave mechanism. Meanwhile many compounds neighboring to MgCNi3were synthesized and the physical properties were investigated, which enriches the physics of the Ni-based antiperovskite compounds and help understand the superconductivity in MgCNi3. In this paper, we summarize the research progress in these two aspects. Moreover, a universal phase diagram of these compounds is presented, which suggests a phonon-mediated mechanism for the superconductivity, as well as a clue for searching new superconductors with the antiperovskite structure. Finally, a few possible scopes for future research are proposed.

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