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Xiao, Qian ; Zhang, Wenliang ; Asmara, Teguh Citra ; Li, Dong ; Li, Qizhi ; Zhang, Shilong ; Tseng, Yi ; Dong, Xiaoli ; Wang, Yao ; Chen, Cheng-Chien ; et al ( , npj Quantum Materials)Abstract The superconducting critical temperature T c of intercalated iron-selenide superconductor (Li,Fe)OHFeSe (FeSe11111) can be increased to 42 from 8 K of bulk FeSe. It shows remarkably similar electronic properties as the high- T c monolayer FeSe and provides a bulk counterpart to investigate the origin of enhanced superconductivity. Unraveling the nature of excitations is crucial for understanding the pairing mechanism in high- T c iron selenides. Here we use resonant inelastic x-ray scattering (RIXS) to investigate the excitations in FeSe11111. Our high-quality data exhibit several Raman-like excitations, which are dispersionless and isotropic in momentum transfer in both superconducting 28 K and 42 K samples. Using atomic multiplet calculations, we assign the low-energy ~0.3 and 0.7 eV Raman peaks as local e g − e g and e g − t 2 g orbital excitations. The intensity of these two features decreases with increasing temperature, suggesting a dominating contribution of the orbital fluctuations. Our results highlight the importance of the orbital degree of freedom for high- T c iron selenides.more » « less
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Wei, Kun ; Wang, Jing ; Sang, Mengmeng ; Zhang, Shilong ; Zhou, Houchao ; Jiang, Libo ; Clavijo Michelangeli, Jose A. ; Vallejos, C. Eduardo ; Wu, Rongling ( , The Plant Journal)