TY - JOUR
T1 - 6-GHz lattice response in a quantum spin-orbital liquid probed by time-resolved resonant x-ray scattering
AU - Takubo, Kou
AU - Mizokawa, Takashi
AU - Man, Huiyuan
AU - Yamamoto, Kohei
AU - Zhang, Yujun
AU - Hirata, Yasuyuki
AU - Wadati, Hiroki
AU - Khomskii, Daniel I.
AU - Nakatsuji, Satoru
N1 - Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/11/15
Y1 - 2021/11/15
N2 - Long-sought quantum spin liquids usually emerge in geometrically frustrated magnets. Less commonly, unfrustrated magnets can harbor a variety of quantum spin liquids if charge and/or orbital degrees of freedom are involved. Jahn-Teller distortion of Cu2+O6 octahedra is absent in hexagonal Ba3CuSb2O9 suggesting a Cu 3d spin-orbital liquid state. Here, by means of time-resolved resonant x-ray scattering, we show that hexagonal Ba3CuSb2O9 exhibits a charge-orbital dynamics which is absent in the orthorhombic phase of Ba3CuSb2O9 with Jahn-Teller distortion and Cu 3d orbital order. The time scale of charge-orbital dynamics manifests in the coherent phonons at 6 GHz. The present work reveals a role of electron-lattice entanglement in the quantum spin-orbital liquid state.
AB - Long-sought quantum spin liquids usually emerge in geometrically frustrated magnets. Less commonly, unfrustrated magnets can harbor a variety of quantum spin liquids if charge and/or orbital degrees of freedom are involved. Jahn-Teller distortion of Cu2+O6 octahedra is absent in hexagonal Ba3CuSb2O9 suggesting a Cu 3d spin-orbital liquid state. Here, by means of time-resolved resonant x-ray scattering, we show that hexagonal Ba3CuSb2O9 exhibits a charge-orbital dynamics which is absent in the orthorhombic phase of Ba3CuSb2O9 with Jahn-Teller distortion and Cu 3d orbital order. The time scale of charge-orbital dynamics manifests in the coherent phonons at 6 GHz. The present work reveals a role of electron-lattice entanglement in the quantum spin-orbital liquid state.
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U2 - 10.1103/PhysRevB.104.205110
DO - 10.1103/PhysRevB.104.205110
M3 - Article
AN - SCOPUS:85119182866
VL - 104
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 20
M1 - 205110
ER -