Antiferromagnetic magnetic transition and spin fluctuations in the deformed pyrochlore compound β -Fe2 (OH)3 Cl

M. Fujihala, M. Hagihala, X. G. Zheng, Tatsuya Kawae

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Magnetism of the rhombohedral structure Fe2 (OH)3 Cl [β -Fe2(OH)3 Cl], a member of the geometric frustration series M2(OH)3 X where the magnetic ions form a deformed pyrochlore lattice, was studied using dc and ac susceptibilities, heat-capacity, neutron powder-diffraction, and muon spin relaxation (μSR) measurements. Antiferromagnetic transition was observed at TN =9.0 K with a much larger Curie-Weiss temperature θw of approximately -64 K, suggesting that Fe2 (OH)3 Cl is a geometrically frustrated magnet. Neutron-diffraction studies revealed the transition into a long-range antiferromagnetic order below TN =9.0 K with the Fe2 + spins on the triangular lattice planes disordered, and the other ones on the kagome lattice planes having frozen moments of less than 70% of the full Fe2+ moment. Spin fluctuations below TN were verified further using μSR studies. The magnetically phase-separated feature and the spin fluctuation coexisting with a long-range magnetic order are considered to be of great interest for studying geometric frustration and the behavior of S=2 spin systems on prochlore and kagome lattices.

Original languageEnglish
Article number024425
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number2
DOIs
Publication statusPublished - Jul 26 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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