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Structural and magnetic phase transitions in NdCoAsO under high pressures. 2010

Walter Uhoya, and Georgiy M Tsoi, and Yogesh K Vohra, and Michael A McGuire, and Athena S Sefat, and Brian C Sales, and David Mandrus, and Samuel T Weir
Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294, USA.

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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