Pressure effects on the transition temperature of superconducting MgCxNi3

H. D. Yang; S. Mollah; W. L. Huang; P. L. Ho; H. L. Huang; C.-J. Liu; J.-Y. Lin; Y.-L. Zhang; R.-C. Yu; C.-Q. Jin

doi:10.1103/PhysRevB.68.092507

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Pressure effects on the transition temperature of superconducting MgCxNi3

H. D. Yang, S. Mollah, W. L. Huang, P. L. Ho, H. L. Huang, C.-J. Liu, J.-Y. Lin, Y.-L. Zhang, R.-C. Yu, C.-Q. Jin

DOI 10.1103/PhysRevB.68.092507 · Physical Review B

T1

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Abstract

The effect of hydrostatic pressure (P) up to 17 kbar on the superconducting transition temperature (TC) of the newly discovered intermetallic nonoxide perovskite superconductor MgCxNi3 has been reported. TC is found to increase with increasing P at a rate of dTC/dP∼0.0134 to 0.0155 K/kbar depending on the value of carbon content x. The absolute value of dTC/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 dlnTC/dP∼0.00181 to 0.00224kbar−1 and the rate of change of TC with unit cell volume (V), dlnTC/dlnV∼−3.18 to −2.58 of MgCxNi3 are having the comparable magnitude to that of MgB2 with opposite sign. The increase of TC with P in MgCxNi3 can be explained in the framework of density of states (DOS) effect.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.9	Pressure unresolved	midpoint
MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.4	Pressure unresolved	midpoint
MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.9	Pressure unresolved	midpoint
MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.56	Pressure unresolved	midpoint
MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.79	1.48 GPa	midpoint
MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38.6	Pressure unresolved	midpoint
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37.5	Pressure unresolved	midpoint
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.9	Pressure unresolved	midpoint
Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.3	Pressure unresolved	midpoint