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Spin correlations of quantum spin liquid and quadrupole-ordered states of Tb<sub>2+<i>x</i></sub> Ti<sub>2-<i>x</i></sub> O<sub>7+<i>y</i></sub>.

ABSTRACT: Spin correlations of the frustrated pyrochlore oxide Tb2+x Ti2-x O7+y have been investigated by using inelastic neutron scattering on single-crystalline samples (x = -0.007, 0.000, and 0.003), which have the putative quantum-spin-liquid (QSL) or electric-quadrupolar ground states. Spin correlations, which are notably observed in nominally elastic scattering, show short-range correlations around L points [q=(12,12,12)], tiny antiferromagnetic Bragg scattering at L and Γ points, and pinch-point-type structures around Γ points. The short-range spin correlations were analyzed using a random-phase approximation (RPA) assuming the paramagnetic state and two-spin interactions among Ising spins. These analyses have shown that the RPA scattering intensity well reproduces the experimental data using temperature- and x-dependent coupling constants of up to tenth-neighbor site pairs. This suggests that no symmetry breaking occurs in the QSL sample and that a quantum treatment beyond the semiclassical RPA approach is required. Implications of the experimental data and the RPA analyses are discussed.

SUBMITTER: Kadowaki H 

PROVIDER: S-EPMC7592423 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Spin correlations of quantum spin liquid and quadrupole-ordered states of Tb&lt;sub&gt;2+&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; Ti&lt;sub&gt;2-&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; O&lt;sub&gt;7+&lt;i&gt;y&lt;/i&gt;&lt;/sub&gt;.

Kadowaki Hiroaki H   Wakita Mika M   Fåk Björn B   Ollivier Jacques J   Ohira-Kawamura Seiko S   Nakajima Kenji K   Lynn Jeffrey W JW  

Physical review. B 20190101

Spin correlations of the frustrated pyrochlore oxide Tb<sub>2+<i>x</i></sub> Ti<sub>2-<i>x</i></sub> O<sub>7+<i>y</i></sub> have been investigated by using inelastic neutron scattering on single-crystalline samples (<i>x</i> = -0.007, 0.000, and 0.003), which have the putative quantum-spin-liquid (QSL) or electric-quadrupolar ground states. Spin correlations, which are notably observed in nominally elastic scattering, show short-range correlations around <i>L</i> points [q=(12,12,12)], tiny anti  ...[more]

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