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

A. Kasahara; B. F{\aa}k; H. Kadowaki; H. Takatsu; J. Ollivier; J. W. Lynn; M. Wakita; S. Kittaka; S. Onoda; T. Sakakibara

arxiv: 1506.04545 · v2 · pith:OVMRGBSAnew · submitted 2015-06-15 · ❄️ cond-mat.str-el · cond-mat.other

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. F{\aa}k

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J. Ollivier J. W. Lynn T. Taniguchi M. Wakita H. Kadowaki

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classification ❄️ cond-mat.str-el cond-mat.other

keywords statefrustratedorderpyrochlorequadrupoleanalysescrystaldemonstrate

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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.

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Quadrupole Order in the Frustrated Pyrochlore Tb_(2+x)Ti_(2-x)O_(7+y)

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