Magnetic properties of stoichiometric Gd monopnictides

D. X. Li, Y. Haga, H. Shida, T. Suzuki, Y. S. Kwon, G. Kido

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Abstract

We report on the systematic magnetization measurements performed on the stoichiometric Gd monopnictides, GdXp (Xp = N, P, As, Sb, and Bi), at temperatures between 1.6 and 350 K in magnetic fields up to 42 T. GdN shows the ferromagnetic behaviour with a Curie temperature Tc = 58 K. The other GdXp samples order antiferromagnetically at the Néel temperatures TN = 15.9, 18.7, 23.4, and 25.8 K for Xp = P, As, Sb, and Bi, respectively. A spin-flop transition is observed at low temperature for GdXp except GdN. Based on molecular field approximation, the nearest-neighbour and next-nearest-neighbour exchange constants J1 and J2 of GdXp are calculated using the experimental data. Comparing with Eu monochalcogenides, the other group of S-state rare-earth compounds, the absolute values of J1 and J2 in GdXp are anomalously large, and the ferromagnetic RKKY interactions due to semimetallic carriers are very weak. These anomalous properties are discussed with a new theoretical model developed very recently by Kasuya.

Original languageEnglish
Pages (from-to)10777-10788
Number of pages12
JournalJournal of Physics Condensed Matter
Volume9
Issue number48
DOIs
Publication statusPublished - 1997 Dec 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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