Abstract
We present the growth and basic magnetic and transport properties of . We show that single crystals can readily be grown from a high-temperature solution created by adding dilute quantities of Cr to Pt-P based melts. Like other 1–5–1 compounds, adopts a tetragonal P4/mmm structure composed face-sharing like slabs that are broken up along the axis by sheets of P atoms. EDS and x-ray diffraction measurements both suggest has mixed occupancy between Cr and Pt atoms, similar to what is found in the closely related compound , giving real compositions of . We report that orders ferromagnetically at K with a saturated moment of at 1.8 K. Likely owing to the strong spin-orbit coupling associated with the large quantity of high Z, Pt atoms, has exceptionally strong planar anisotropy with estimated anisotropy fields of 345 kOe and 220 kOe at 1.8 K and 300 K, respectively. The resistance of has a metallic temperature dependence with relatively weak magnetoresistance. Electronic band structure calculations show that has a large peak in the density of states near the Fermi level, which is split into spin majority and minority bands in the ferromagnetic state. Furthermore, the calculations suggest substantial hybridization between and states near the Fermi level, in agreement with the experimentally measured anisotropy.
- Received 26 October 2022
- Accepted 20 December 2022
DOI:https://doi.org/10.1103/PhysRevMaterials.7.024410
©2023 American Physical Society
Physics Subject Headings (PhySH)
synopsis
A New Route to Room-Temperature Ferromagnets
Published 21 February 2023
A novel crystalline material is readily grown from low-melting-temperature mixtures—a result that points toward a new route to above-room-temperature ferromagnets.
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