Coupled frustrated quantum spin-1/2 chains with orbital order in volborthite Cu3V2O7(OH)2(H2O)2

O. Janson; J. Richter; P. Sindzingre; H. Rosner

doi:10.1103/PhysRevB.82.104434

Coupled frustrated quantum spin-1/2 chains with orbital order in volborthite Cu3V2O7(OH)2(H2O)2

Strongly Correlated Electrons 2010-10-04 v2 Materials Science

Authors: O. Janson , J. Richter , P. Sindzingre , H. Rosner

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Abstract

We present a microscopic magnetic model for the spin-liquid candidate volborthite Cu3V2O7(OH)2(H2O)2. The essentials of this DFT-based model are (i) the orbital ordering of Cu(1) 3d 3z2-r2 and Cu(2) 3d 3x2-y2, (ii) three relevant couplings J_ic, J_1 and J_2, (iii) the ferromagnetic nature of J_1 and (iv) frustration governed by the next-nearest-neighbor exchange interaction J_2. Our model implies magnetism of frustrated coupled chains in contrast to the previously proposed anisotropic kagome model. Exact diagonalization studies reveal agreement with experiments.

Keywords

volborthite spin liquid orbital ordering frustrated quantum spin chains DFT-based model kagome model

Cite

@article{arxiv.1004.2185,
  title  = {Coupled frustrated quantum spin-1/2 chains with orbital order in volborthite Cu3V2O7(OH)2(H2O)2},
  author = {O. Janson and J. Richter and P. Sindzingre and H. Rosner},
  journal= {arXiv preprint arXiv:1004.2185},
  year   = {2010}
}

Comments

5 pages, 4 figures + supplementary

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