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arXiv 1104.3172cond-mat.supr-concond-mat.mtrl-scicond-mat.other
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高压下NdCoAsO的结构和磁性相变

Structural and Magnetic Phase Transitions in NdCoAsO under High Pressures

Walter Uhoya, Georgiy M. Tsoi, Yogesh K. Vohra, Michael A. McGuire, Athena S. Sefat, Brian C. Sales, David Mandrus, Samuel T. Weir

摘要:

我们研究了与高温超导体NdFeAsO同构的四元稀土过渡金属砷氧化物NdCoAsO化合物在高压下的结构和磁性相变。在金刚石压砧单元中进行的四探针电阻测量表明,铁磁居里温度和反铁磁尼尔温度随着压力的增加而增加。利用同步辐射源的高压X射线衍射研究表明,在300 K,23 GPa的压力下,从四方相到新的晶体相的结构相变。NdCoAsO样品保持反铁磁和非超导的温度下降到10 K,并在该实验中达到的最高压力为53 GPa。给出了NdCoAsO在53 GPa和10 K低温下的P-T相图。

英文摘要:

We have investigated structural and magnetic phase transitions under high pressures in a quaternary rare earth transition metal arsenide oxide NdCoAsO compound that is isostructural to high temperature superconductor NdFeAsO. Four-probe electrical resistance measurements carried out in a designer diamond anvil cell show that the ferromagnetic Curie temperature and anti-ferromagnetic Neel temperature increase with an increase in pressure. High pressure x-ray diffraction studies using a synchrotron source show a structural phase transition from a tetragonal phase to a new crystallographic phase at a pressure of 23 GPa at 300 K. The NdCoAsO sample remained anti-ferromagnetic and non-superconducting to temperatures down to 10 K and to the highest pressure achieved in this experiment of 53 GPa. A P-T phase diagram for NdCoAsO is presented to a pressure of 53 GPa and low temperatures of 10 K.

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