Enhancement of Superconductivity and Structural Instability by Sn Substitution in LaO0.5F0.5BiS2

Kobayashi, Sora; Hara, Takeshi; Noguchi, Kanako; Takeda, Tomoko; Kurihara, Ryosuke; Nomura, Atsushi; Demura, Satoshi; Yaguchi, Hiroshi; Sawa, Hiroshi; Sakata, Hideaki

doi:10.7566/jpsj.93.024707

J. Phys. Soc. Jpn.

2024

DOI: 10.7566/jpsj.93.024707

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Enhancement of Superconductivity and Structural Instability by Sn Substitution in LaO_0.5F_0.5BiS₂

Sora Kobayashi,

Takeshi Hara,

Kanako Noguchi

et al.

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Local-structure insight into the improved superconducting properties of Pb-substituted La(O,F)BiS2: A photoelectron holography study

Li,

Hashimoto,

Kataoka

et al. 2024

Preprint

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Pb-substituted La(O,F)BiS2 (Pb-LaOFBiS2) exhibits improved superconducting properties and a resistivity anomaly around 100 K that is attributed to a structural transition. We have performed temperature(T)-dependent photoelectron holography (PEH) to study dopant incorporation sites and the local structure change across the anomaly. PEH study of Pb-LaOFBiS2 provided evidence for the dominant incorporation sites of Pb and F: Pb atoms are incorporated into the Bi sites and F atoms are incorporated into the O site. No remarkable difference in the local structures around Pb and Bi atoms were observed. Across the temperature of the resistivity anomaly (T*), photoelectron holograms of Bi 4f changed. Comparison of holograms with those of non-substituted LaOFBiS2 sample, as well as simulated holograms, suggested that (1), above T*, the tetragonal structure of Pb-LaOFBiS2 are different from the tetragonal structure of LaOFBiS2 and (2), below T*, the tetragonal structure still remains in Pb-LaOFBiS2. We discuss possible origin of the difference in the structure above T* and implication of the result below T*, which are necessary ingredients to understand the physical properties of Pb-LaOFBiS2.

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Local-structure insight into the improved superconducting properties of Pb-substituted La(O,F)BiS2: A photoelectron holography study

Li,

Hashimoto,

Kataoka

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

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Enhancement of Superconductivity and Structural Instability by Sn Substitution in LaO_0.5F_0.5BiS₂

Cited by 1 publication

References 28 publications

Local-structure insight into the improved superconducting properties of Pb-substituted La(O,F)BiS2: A photoelectron holography study

Local-structure insight into the improved superconducting properties of Pb-substituted La(O,F)BiS2: A photoelectron holography study

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