Spin-orbital liquid inBa3CuSb2O9stabilized by oxygen holes,Physical Review Materials

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Spin-orbital liquid inBa3CuSb2O9stabilized by oxygen holes
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-07-19 , DOI: 10.1103/physrevmaterials.5.075002
Kou Takubo _{1,

2} , Huiyuan Man _{1,

3} , Satoru Nakatsuji _{1,

3,

4} , Kohei Yamamoto ₁ , Yujun Zhang ₁ , Yasuyuki Hirata ₁ , Hiroki Wadati _{1,

5} , Akira Yasui ₆ , Takashi Mizokawa ₇ , Daniel I. Khomskii ₈

Affiliation

We report x-ray and optical absorption spectroscopy as well as hard x-ray photoemission spectroscopy on hexagonal

{Ba}_{3} {CuSb}_{2} O_{9}

in which a Cu

3 d

spin-orbital liquid state is suggested from absence of the Jahn-Teller distortion of

{Cu}^{2 +} O_{6}

octahedra and of the magnetic ordering. The experimental results and their cluster model analysis indicate that O

2 p

holes play a crucial role in realizing the spin-orbital liquid state of hexagonal

{Ba}_{3} {CuSb}_{2} O_{9}

. These oxygen holes appear due to the “reaction”

{Sb}^{5 +} \to {Sb}^{3 +} +

two O

2 p

holes, with these holes being able to attach to Cu ions. The present work opens avenues towards spin-charge-orbital entangled liquid state in transition-metal oxides with small or negative charge transfer energy.

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