Structural and Magnetic Phase Transitions in NdCoAsO under High Pressures

Autor:	Uhoya, Walter, Tsoi, Georgiy M., Vohra, Yogesh K., McGuire, Michael A., Sefat, Athena S., Sales, Brian C., Mandrus, David, Weir, Samuel T.
Rok vydání:	2011
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Materials Science Condensed Matter - Other Condensed Matter
Zdroj:	J. Phys.: Condens. Matter 22 (2010) 185702
Druh dokumentu:	Working Paper
DOI:	10.1088/0953-8984/22/18/185702
Popis:	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. Comment: 6 pages, 6 figures, available online at stacks.iop.org/JPhysCM/22/185702
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1104.3172 Zobrazit plný text záznamu View this record from Arxiv