Pressure-induced modification of crystal structure in NdFeAsO1-y(1-y = 0.85), accompanied by remarkable suppression of Tc

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  • Kumai Reiji
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Takeshita Nao
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Ito Toshimitsu
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Kito Hijiri
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Iyo Akira
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Eisaki Hiroshi
    National Institute of Advanced Industrial Science and Technology (AIST)

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タイトル別名
  • Pressure-Induced Modification of Crystal Structure in NdFeAsO<SUB>1−<I>y</I></SUB> (1−<I>y</I>=0.85), Accompanied by Remarkable Suppression of <I>T</I><SUB>c</SUB>
  • Pressure-Induced Modification of Crystal Structure in NdFeAsO<sub>1-<i>y</i></sub> (1-<i>y</i>=0.85), Accompanied by Remarkable Suppression of <i>T</i><sub>c</sub>

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抄録

The atomic positions of the title oxypnictide compound under pressure were determined by Rietveld analysis of synchrotron X-ray diffraction data. Hydrostatic pressure has effects on the crystal structure in two points: (i) nearly isotropic compression of each of the Fe–As and Nd–O layers at the rate of ∼0.2%/GPa and (ii) outstanding shrinkage of the interlayer spacing (defined as the distance between adjacent As and Nd planes in this paper) at the rate of ∼0.7%/GPa. Remarkable suppression of Tc by hydrostatic pressure would originate from the change in the electronic structure caused by the modification of the crystal structure. The possible origins will be discussed.

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