Pressure driven magnetic order in Sr[Formula: see text]Ca[Formula: see text]Co[Formula: see text]P[Formula: see text]

Ola Kenji Forslund; Daniel Andreica; Yasmine Sassa; Masaki Imai; Chishiro Michioka; Kazuyoshi Yoshimura; Zurab Guguchia; Zurab Shermadini; Rustem Khasanov; Jun Sugiyama; Martin Månsson

doi:10.1038/s41598-022-21699-y

Pressure driven magnetic order in Sr[Formula: see text]Ca[Formula: see text]Co[Formula: see text]P[Formula: see text]

Sci Rep. 2022 Oct 20;12(1):17526. doi: 10.1038/s41598-022-21699-y.

Authors

Affiliations

¹ Department of Applied Physics, KTH Royal Institute of Technology, 106 91 Stockholm, Sweden.
² Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.
³ Department of Physics, Chalmers University of Technology, 41296 Göteborg, Sweden.
⁴ Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502 Japan.
⁵ Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland.
⁶ Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106 Japan.

Abstract

The magnetic phase diagram of Sr[Formula: see text]Ca[Formula: see text]Co[Formula: see text]P[Formula: see text] as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance ([Formula: see text]SR). The weak pressure dependence for the [Formula: see text] compounds suggests that the rich phase diagram of Sr[Formula: see text]Ca[Formula: see text]Co[Formula: see text]P[Formula: see text] as a function of x at ambient pressure may not solely be attributed to chemical pressure effects. The [Formula: see text] compound on the other hand reveals a high pressure dependence, where the long range magnetic order is fully suppressed at [Formula: see text] kbar, which seem to be a first order transition. In addition, an intermediate phase consisting of magnetic domains is formed above [Formula: see text] kbar where they co-exist with a magnetically disordered state. These domains are likely to be ferromagnetic islands (FMI) and consist of an high- (FMI-[Formula: see text]) and low-temperature (FMI-[Formula: see text]) region, respectively, separated by a phase boundary at [Formula: see text] K. This kind of co-existence is unusual and is originating from a coupling between lattice and magnetic degrees of freedoms.