Two-step antiferromagnetic transition and moderate triangular frustration in Li2Co(WO4)2

I. Panneer Muthuselvam, R. Sankar, A. V. Ushakov, G. Narsinga Rao, Sergey V. Streltsov, and F. C. Chou
Phys. Rev. B 90, 174430 – Published 21 November 2014

Abstract

We present a detailed investigation of the magnetic properties of the spin-32 system Li2Co(WO4)2 by means of magnetic susceptibility and specific heat. Our experimental results show that in Li2Co(WO4)2 short-range antiferromagnetic (AFM) correlations appear near χmax11K and two successive long-range AFM phase transitions are observed at TN19 and TN27K. The frustration factor |Θ|/TN13 indicates that the system is moderately frustrated, which is identifiable by the broken triangular symmetry within both ab and bc planes for the triclinic crystal structure. The magnetic isotherm at temperatures below TN2 shows a field-induced spin-flop transition, and a complete HT phase diagram for the two-step AFM system is mapped. Ab initio band-structure calculations suggest that the strongest exchange coupling does not correspond to the shortest Co-Co distance along the a axis but rather along the diagonal direction through a Co-O-W-O-Co supersuperexchange path within the bc plane.

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  • Received 19 October 2014
  • Revised 9 November 2014

DOI:https://doi.org/10.1103/PhysRevB.90.174430

©2014 American Physical Society

Authors & Affiliations

I. Panneer Muthuselvam1, R. Sankar1, A. V. Ushakov2, G. Narsinga Rao1, Sergey V. Streltsov2,3, and F. C. Chou1,4,5,*

  • 1Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
  • 2Institute of Metal Physics, Russian Academy of Science, S. Kovalevskaya Street 18, 620041 Ekaterinburg, Russia
  • 3Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia
  • 4National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • 5Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10622, Taiwan

  • *Corresponding author: fcchou@ntu.edu.tw

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Vol. 90, Iss. 17 — 1 November 2014

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