Temperature dependence of the structural parameters of the non-oxide perovskite superconductor MgCNi3

Details Temperature dependence of the structural parameters of the non-oxide perovskite superconductor MgCNi3 Temperature dependence of the structural parameters of the non-oxide perovskite superconductor MgCNi3

2001-05-11

arxiv.org/abs/cond-mat/0105240v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/S0921-4534(01)01068-1

We report the structural parameters of superconducting MgCxNi3 (x=0.96, TC=7.3 K) as a function of temperature, from 2 K to 295 K, determined by neutron powder diffraction profile refinement. The compound has the perovskite structure over the whole temperature range, with symmetry Pm3m and a=3.81221(5) A at 295 K: no structural or long range magnetic ordering transitions were observed. The lattice parameter a and the Debye-Waller factors for the individual atoms decrease smoothly with decreasing temperature. There are no unusual changes of the structural parameters near TC.

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