## 摘要

The effect of hydrostatic pressure (P) up to 17 kbar on the superconducting transition temperature (TC) of the newly discovered intermetallic nonoxide perovskite superconductor MgC_{x}Ni_{3} has been reported. TC is found to increase with increasing P at a rate of dT_{C}/dP∼0.0134 to 0.0155 K/kbar depending on the value of carbon content x. The absolute value of dT_{C}/dP for MgC_{x}Ni_{3} is about the same as that of intermetallic RNi_{2}B_{2}C (R denotes rare earth) and metallic superconductors but about one order of magnitude smaller than that of the most recently and intensively studied superconductor MgB_{2}. However, the d ln T_{C}/dP∼0.001 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 V∼-3.18 to-2.58 of MgC_{x}Ni_{3} are having the comparable magnitude to that of MgB_{2} with opposite sign. The increase of T_{C} with P in MgC_{x}Ni_{3} can be explained in the framework of density of states (DOS) effect.

原文 | English |
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期刊 | Physical Review B - Condensed Matter and Materials Physics |

卷 | 68 |

發行號 | 9 |

DOIs | |

出版狀態 | Published - 1 1月 2003 |

## 指紋

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