Quadrupole Order in the Frustrated Pyrochlore Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$

H. Takatsu; S. Onoda; S. Kittaka; A. Kasahara; Y. Kono; T. Sakakibara; Y. Kato; B. Fåk; J. Ollivier; J. W. Lynn; T. Taniguchi; M. Wakita; H. Kadowaki

doi:10.1103/PhysRevLett.116.217201

Quadrupole Order in the Frustrated Pyrochlore Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$

Strongly Correlated Electrons 2016-06-22 v2 Other Condensed Matter

Authors: H. Takatsu , S. Onoda , S. Kittaka , A. Kasahara , Y. Kono , T. Sakakibara , Y. Kato , B. Fåk , J. Ollivier , J. W. Lynn , T. Taniguchi , M. Wakita , H. Kadowaki

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Abstract

A hidden order that emerges in the frustrated pyrochlore Tb $_{2+x}$ Ti $_{2-x}$ O $_{7+y}$ with $T_{\text{c}}=0.53$ K is studied using specific heat, magnetization, and neutron scattering experiments on a high-quality single crystal. Semi-quantitative analyses based on a pseudospin-1/2 Hamiltonian for ionic non-Kramers magnetic doublets demonstrate that it is an ordered state of electric quadrupole moments. The elusive spin liquid state of the nominal Tb $_2$ Ti $_2$ O $_7$ is most likely a U(1) quantum spin-liquid state.

Keywords

frustrated pyrochlore quadrupole order hidden order specific heat neutron scattering pseudospin-1/2 hamiltonian non-kramers doublets quantum spin liquid

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@article{arxiv.1506.04545,
  title  = {Quadrupole Order in the Frustrated Pyrochlore Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$},
  author = {H. Takatsu and S. Onoda and S. Kittaka and A. Kasahara and Y. Kono and T. Sakakibara and Y. Kato and B. Fåk and J. Ollivier and J. W. Lynn and T. Taniguchi and M. Wakita and H. Kadowaki},
  journal= {arXiv preprint arXiv:1506.04545},
  year   = {2016}
}

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5 pages, 5 figures, including Supplemental Material

Quadrupole Order in the Frustrated Pyrochlore Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$

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