Presence of parimagnetism in HoCo2 under hydrostatic pressure

18th APS-SCCM; 24th AIRAPT

Valenta, J.^1 ; Prchal, J.^1 ; Khasanov, R.^2 ; Kratochvílová, M.^1 ; Míek, M.^1 ; Valika, M.^1 ; Sechovský, V.^1

Charles University in Prague, Faculty of Mathematics and Physics, DCMP, Ke Karlovu 5, Praha 2

121 116, Czech Republic^1

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI

CH-5232, Switzerland^2

关键词: AC Magnetic susceptibility;    Antiparallel configuration;    Characteristic temperature;    Ferromagnetic clusters;    Magnetic sublattices;    Muon spin relaxation;    Paramagnetic range;    Pressure dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/18/182041/pdf
DOI  :  10.1088/1742-6596/500/18/182041

来源: IOP

【 摘 要 】

This paper deals with a pressure evolution of newly observed phenomenon -parimagnetism in HoCo2. HoCo2containing localized Ho magnetic moments and itinerant Co magnetic moments order ferrimagnetically below TC= 79.5 K at ambient pressure. The corresponding Ho and Co magnetic sublattices are ferromagnetic and coupled mutually antiparallel. In paramagnetic range, the Co moments form ferromagnetic clusters which hold short range antiparallel configuration with the nearest Ho moments at temperatures up to the flipping temperature Tf= 125 K. The decay of Co clusters was observed by muon spin relaxation spectroscopy (μSR) at T∗∼ 170 K. Our results of AC-magnetic susceptibility and zero-field μSR measurements of HoCo2at ambient and hydrostatic pressures presented in this paper reveal strong pressure dependence of the characteristic temperatures which is closely related to the itinerant character of Co magnetism and variations of exchange interactions.