Continuum excitation and pseudospin wave in quantum spin-liquid and quadrupole ordered states of Tb $_{2+x}$ Ti $_{2-x}$ O $_{7+y}$

Kadowaki, Hiroaki*; Wakita, Mika*; Fk, B.*; Ollivier, J.*; Kawamura, Seiko ; Nakajima, Kenji ; Takatsu, Hiroshi*; Tamai, Mototake*

The ground states of the frustrated pyrochlore oxide Tb $_{2+x}$ Ti $_{2-x}$ O $_{7+y}$ have been studied by inelastic neutron scattering experiments. Three single-crystal samples are investigated; one shows no phase transition ( $x = -0.007 < x_{c} < sim -0.0025$ ), being a putative quantum spin-liquid (QSL), and the other two () show electric quadrupole ordering (QO) below $T_{c} sim 0.5$ K. The QSL sample shows continuum excitation spectra with an energy scale 0.1 meV as well as energy-resolution-limited (nominally) elastic scattering. As is increased, pseudospin wave of the QO state emerges from this continuum excitation, which agrees with that of powder samples and consequently verifies good control for the present single crystal samples.

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	87
Number	:	6
Pages	:	p.064704_1 - 064704_6
Publication Year/Month	:	2018/06
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Paper URL	:	https://doi.org/10.7566/JPSJ.87.064704
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	J-PARC; 中性子非弾性散乱; AMATERAS
Research Facility	:	J-PARC物質・生命科学実験施設
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Registration No. : AA20180071
JAEA Abstracts No. : 46000960
Paper Submission No. : 20528

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Continuum excitation and pseudospin wave in quantum spin-liquid and quadrupole ordered states of TbTiO

Continuum excitation and pseudospin wave in quantum spin-liquid and quadrupole ordered states of Tb $_{2+x}$ Ti $_{2-x}$ O $_{7+y}$