Stability of the spin-12 kagome ground state with breathing anisotropy

Cécile Repellin, Yin-Chen He, and Frank Pollmann
Phys. Rev. B 96, 205124 – Published 14 November 2017

Abstract

We numerically study the spin-12 breathing kagome lattice. In this variation of the kagome Heisenberg antiferromagnet, the spins belonging to upward and downward facing triangles have different coupling strengths. Using the density matrix renormalization group (DMRG) method and exact diagonalization, we show that the kagome antiferromagnet spin liquid is extremely robust to this anisotropy. Materials featuring this anisotropy—and especially the recently studied vanadium compound [NH4]2[C7H14N][V7O6F18] (DQVOF)—may thus be very good candidates to realize the much studied kagome spin liquid. Further, we closely examine the limit of strong breathing anisotropy and find indications of a transition to a nematic phase.

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  • Received 21 July 2017
  • Revised 6 November 2017

DOI:https://doi.org/10.1103/PhysRevB.96.205124

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Cécile Repellin1, Yin-Chen He2, and Frank Pollmann3

  • 1Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany
  • 2Department of Physics, Harvard University, Cambridge, Massachusetts, 02138, USA
  • 3Technische Universität München, Physics Department T42, 85747 Garching, Germany

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Issue

Vol. 96, Iss. 20 — 15 November 2017

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