Mn(Pt1-xPdx)5 P: Isovalent tuning of Mn-sublattice magnetic order

Tyler J. Slade, Ranuri S.Dissanayaka Mudiyanselage, Nao Furukawa, Tanner R. Smith, Juan Schmidt, Lin Lin Wang, Chang Jong Kang, Kaya Wei, Zhixue Shu, Tai Kong, Ryan Baumbach, Gabriel Kotliar, Sergey L. Bud'Ko, Weiwei Xie, Paul C. Canfield

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1 Scopus citations

Abstract

We report the growth and characterization of MnPd5P, a rare-earth-free ferromagnet, with TC≈295K and planar anisotropy, and conduct a substitutional study with its antiferromagnetic analog MnPt5P. All compounds in the family adopt the layered anti-CeCoIn5-type structure with the space group P4/mmm, and EDS and x-ray diffraction results indicate that MnPt5P and MnPd5P form a complete solid solution. Based on measurements of the temperature- and field-dependent magnetization and resistance, we construct a temperature-composition (T-x) phase diagram for Mn(Pt1-xPdx)5P and demonstrate that the essentially antiferromagnetic order found in MnPt5P is extraordinarily sensitive to Pd substitution. At low Pd fractions (x<0.010), the single antiferromagnetic-like transition in pure MnPt5P splits into a higher-temperature ferromagnetic transition followed first, upon cooling, by a lower temperature ferromagnetic to antiferromagnetic transition and then by a re-entrant antiferromagnetic to ferromagnetic transition at even lower temperatures. The antiferromagnetic region makes up a bubble phase that persists up to x≈0.008-0.009 for T≈150K, with all samples 0≤x<0.008 recovering their initial ferromagnetic state upon further cooling to base temperature. Once x>0.010, Mn(Pt1-xPdx)5P undergoes a only single transition into the ferromagnetic phase. The Curie temperature initially increases rapidly with x, rising from TC≈197K at x = 0.013 to a maximum of TC≈312K for x≈0.62, and then falling back to TC≈295K for pure MnPd5P (x=1.00). Given that Pt and Pd are isoelectronic, this work raises questions as to the origin of the extreme sensitivity of the magnetic ground state and the nature of the re-entrant ferromagnetism at dilute Pd levels.

Original languageEnglish (US)
Article number134429
JournalPhysical Review B
Volume107
Issue number13
DOIs
StatePublished - Apr 1 2023

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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