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

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7 Scopus citations

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 23GPa at 300K. The NdCoAsO sample remained antiferromagnetic and non-superconducting down to 10K and up to the highest pressure achieved in this experiment, 53GPa. A P-T phase diagram for NdCoAsO is presented from ambient conditions to P = 53GPa and T = 10K.

Original languageEnglish
Article number185702
JournalJournal of Physics Condensed Matter
Volume22
Issue number18
DOIs
StatePublished - 2010

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