Drastic anion substitution effect in deformed pyrochlore lattice Co2(OH)3Cl1-xBrx

Masato Hagihala, X. G. Zheng, Tatsuya Kawae

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Abstract

As a part of an extensive study of the new geometric frustration series M2(OH)3X (M: 3d magnetic ion; X: halogen ion) on deformed pyrochlore lattice we have investigated in detail the magnetism of Co2(OH)3Cl1-xBrx, in which the magnetic state was found to be very sensitive to the anion substitution. Co2(OH)3Br was found to undergo antiferromagnetic transitions at TN1=6.2 K and TN2=4.8 K, respectively, which are contrasting as compared to the partial ferromagnetic state in Co2(OH)3Cl. Muon spin precession was observed with additional fast relaxation below TN1, implying coexisting spin-fluctuation. Meanwhile, the partially substituted Co2(OH)3Cl1-xBrx transforms from ferromagnetic to antiferromagnetic by increasing the x ratio. The present work presents a unique system to investigate the critical role of the tetrahedral distortion in geometric frustration.

Original languageEnglish
Pages (from-to)671-673
Number of pages3
JournalPhysica B: Condensed Matter
Volume404
Issue number5-7
DOIs
Publication statusPublished - Apr 15 2009

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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