Pressure effects on the Tc of superconducting MgCxNi3

Details Pressure effects on the Tc of superconducting MgCxNi3 Pressure effects on the Tc of superconducting MgCxNi3

2003-08-11

arxiv.org/abs/cond-mat/0308197v1

Physical Review B 68, 092507 (2003).

Physics

Condensed Matter

Superconductivity

7 pages, 3 figures, Phys. Rev. B, in press

Scientific paper

10.1103/PhysRevB.68.092507

The effect of hydrostatic pressure (P) up to 17 kbar on the superconducting transition temperature (Tc) of the newly discovered intermetallic non-oxide perovskite superconductor MgCxNi3 has been reported. The 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 = rare earths) 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 0.00224 kbar-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 frame work of density of states (DOS) effect.

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