Pressure driven magnetic order in Sr[Formula: see text]Ca[Formula: see text]Co[Formula: see text]P[Formula: see text]
Ola Kenji Forslund1, Daniel Andreica2, Yasmine Sassa3
1Department of Applied Physics, KTH Royal Institute of Technology, 106 91 Stockholm, Sweden.
Scientific Reports
|October 20, 2022
Summary
High pressure muon spin rotation reveals the magnetic phase diagram of SrCaCoP compounds. The SrCoP compound shows pressure-induced magnetic order suppression and an unusual intermediate phase of ferromagnetic islands.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- The magnetic phase diagram of Sr[Formula: see text]Ca[Formula: see text]Co[Formula: see text]P[Formula: see text] (SCCOP) is complex and varies with composition (x).
- Understanding the influence of external stimuli like pressure is crucial for characterizing magnetic materials.
Purpose of the Study:
- To investigate the magnetic phase diagram of SCCOP under hydrostatic pressure and temperature.
- To elucidate the role of pressure in tuning the magnetic properties of SCCOP.
Main Methods:
- High pressure muon spin rotation, relaxation, and resonance ([mu]SR) spectroscopy was employed.
- Measurements were conducted as a function of hydrostatic pressure and temperature.
Main Results:
- The Sr[Formula: see text] compounds exhibit weak pressure dependence, suggesting ambient pressure phase complexity is not solely due to chemical pressure.
- The Sr[Formula: see text] compound shows significant pressure dependence, with long-range magnetic order suppressed above [Formula: see text] kbar, indicating a first-order transition.
- An intermediate phase with coexisting magnetic domains (ferromagnetic islands, FMI) and a disordered state emerges above [Formula: see text] kbar.
- These ferromagnetic islands (FMI-[Formula: see text] and FMI-[Formula: see text]) are separated by a phase boundary at [Formula: see text] K, indicating unusual co-existence driven by lattice-magnetic coupling.
Conclusions:
- Hydrostatic pressure significantly alters the magnetic phase diagram of SCCOP, particularly for the Sr[Formula: see text] composition.
- The observed intermediate phase with coexisting ferromagnetic islands and a disordered state is a novel phenomenon in this system.
- The interplay between lattice and magnetic degrees of freedom is key to understanding the unusual magnetic behavior under pressure.
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