標題: Pressure effects on the transition temperature of superconducting MgCxNi3
作者: Yang, HD
Mollah, S
Huang, WL
Ho, PL
Huang, HL
Liu, CJ
Lin, JY
Zhang, YL
Yu, RC
Jin, CQ
物理研究所
Institute of Physics
公開日期: 1-Sep-2003
摘要: The effect of hydrostatic pressure (P) up to 17 kbar on the superconducting transition temperature (T-C) of the newly discovered intermetallic nonoxide perovskite superconductor MgCxNi3 has been reported. T-C is found to increase with increasing P at a rate of dT(C)/dPsimilar to0.0134 to 0.0155 K/kbar depending on the value of carbon content x. The absolute value of dT(C)/dP for MgCxNi3 is about the same as that of intermetallic RNi2B2C (R denotes rare earth) and metallic superconductors but about one order of magnitude smaller than that of the most recently and intensively studied superconductor MgB2. However, the d ln T-C/dPsimilar to0.001 81 to 0.002 24 kbar(-1) and the rate of change of T-C with unit cell volume (V), d ln T-C/d ln Vsimilar to-3.18 to -2.58 of MgCxNi3 are having the comparable magnitude to that of MgB2 with opposite sign. The increase of T-C with P in MgCxNi3 can be explained in the framework of density of states (DOS) effect.
URI: http://dx.doi.org/10.1103/PhysRevB.68.092507
http://hdl.handle.net/11536/27596
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.68.092507
期刊: PHYSICAL REVIEW B
Volume: 68
Issue: 9
起始頁: 0
結束頁: 0
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