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High-temperature ferromagnetism in Cr1+xPt5xP

Tyler J. Slade, Nao Furukawa, Tanner R. Smith, Juan Schmidt, Ranuri S. Dissanayaka Mudiyanselage, Lin-Lin Wang, Weiwei Xie, Sergey L. Bud'ko, and Paul C. Canfield
Phys. Rev. Materials 7, 024410 – Published 21 February 2023
Physics logo See synopsis: A New Route to Room-Temperature Ferromagnets

Abstract

We present the growth and basic magnetic and transport properties of Cr1+xPt5xP. 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, Cr1+xPt5xP adopts a tetragonal P4/mmm structure composed face-sharing CrPt3 like slabs that are broken up along the c axis by sheets of P atoms. EDS and x-ray diffraction measurements both suggest Cr1+xPt5xP has mixed occupancy between Cr and Pt atoms, similar to what is found in the closely related compound CrPt3, giving real compositions of Cr1.5Pt4.5P (x=0.5). We report that Cr1.5Pt4.5P orders ferromagnetically at TC=464.5 K with a saturated moment of 2.1μB/Cr at 1.8 K. Likely owing to the strong spin-orbit coupling associated with the large quantity of high Z, Pt atoms, Cr1.5Pt4.5P 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 Cr1.5Pt4.5P has a metallic temperature dependence with relatively weak magnetoresistance. Electronic band structure calculations show that CrPt5P 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 Cr3d and Pt5d states near the Fermi level, in agreement with the experimentally measured anisotropy.

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  • 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)

Condensed Matter, Materials & Applied Physics

synopsis

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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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Authors & Affiliations

Tyler J. Slade1,2,*, Nao Furukawa1,2, Tanner R. Smith1,2, Juan Schmidt1,2, Ranuri S. Dissanayaka Mudiyanselage3, Lin-Lin Wang1, Weiwei Xie3,4, Sergey L. Bud'ko1,2, and Paul C. Canfield1,2,†

  • 1Ames National Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Department of Chemistry and Chemical Biology, The State University of New Jersey Rutgers, Piscataway, New Jersey 08854, USA
  • 4Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA

  • *Corresponding author: slade@ameslab.gov
  • canfield@ameslab.gov

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Vol. 7, Iss. 2 — February 2023

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