6-GHz lattice response in a quantum spin-orbital liquid probed by time-resolved resonant x-ray scattering

被引：1
|
作者：
Takubo, Kou [1 ,2 ]
Mizokawa, Takashi [3 ]
Man, Huiyuan [1 ,4 ,5 ]
Yamamoto, Kohei [1 ]
Zhang, Yujun [1 ]
Hirata, Yasuyuki [1 ]
Wadati, Hiroki [1 ,6 ]
Khomskii, Daniel, I [7 ]
Nakatsuji, Satoru [1 ,4 ,5 ,8 ]
机构：
[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
[2] Tokyo Inst Technol, Dept Chem, Meguro Ku, Tokyo 1528551, Japan
[3] Waseda Univ, Dept Appl Phys, Okubo, Tokyo 2778581, Japan
[4] Johns Hopkins Univ, Inst Quantum Matter, Baltimore, MD 21218 USA
[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[6] Univ Hyogo, Grad Sch Mat Sci, Koto, Hyogo 6781297, Japan
[7] Univ Cologne, Phys Inst 2, Zulpicher Str, D-50937 Cologne, Germany
[8] Univ Tokyo, Dept Phys, Hongo, Tokyo 1130033, Japan
来源：
PHYSICAL REVIEW B | 2021年 / 104卷 / 20期
关键词：
ORDER;
D O I：
10.1103/PhysRevB.104.205110
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：5
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