Prando, G. and Sanna, S. and Khasanov, R. and Pal, A. and Brüning, E. M. and Mazzani, M. and Awana, V. P. S. and Büchner, B. and DeRenzi, R. (2015) Effect of external pressure on the magnetic properties of RCoAsO (R=La, Pr, Sm): a mu SR study. Journal of Physics and Chemistry of Solids , 84. pp. 63-69. ISSN 0022-3697

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We report on a detailed investigation of the itinerant ferromagnets LaCoAsO, PrCoAsO and SmCoAsO performed by means of muon spin spectroscopy upon the application of external hydrostatic pressures p up to 2.4 GPa. These materials are shown to be magnetically hard in view of the weak dependence of both critical temperatures T-C and internal fields at the muon site on p. In the cases R=La and Sm, the behaviour of the internal field is substantially unaltered up to p=2.4 GPa. A much richer phenomenology is detected in PrCoAsO instead, possibly associated with a strong p dependence of the statistical population of the two different crystallographic sites for the muon. Surprisingly, results are notably different from what is observed in the case of the isostructural compounds RCoPO, where the full As/P substitution is leading to smaller values of unit cell volume already at ambient pressure but p is still very effective in further affecting the magnetic properties.

Item Type: Article
Uncontrolled Keywords: Itinerant ferromagnetism Pnictides Muon spinspectroscopy Pressure
Subjects: Chemistry
Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 21 Sep 2016 11:44
Last Modified: 21 Sep 2016 11:44

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