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  • Title: Structural and magnetic phase transitions in NdCoAsO under high pressures.
    Author: Uhoya W, Tsoi GM, Vohra YK, McGuire MA, Sefat AS, Sales BC, Mandrus D, Weir ST.
    Journal: J Phys Condens Matter; 2010 May 12; 22(18):185702. PubMed ID: 21393689.
    Abstract:
    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 the high temperature superconductor parent phase NdFeAsO. The four-probe electrical resistance measurements carried out in a designer diamond anvil cell show that the ferromagnetic Curie temperature and antiferromagnetic Néel 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 antiferromagnetic and non-superconducting down to 10 K and up to the highest pressure achieved in this experiment, 53 GPa. A P-T phase diagram for NdCoAsO is presented from ambient conditions to P = 53 GPa and T = 10 K.
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