Comparative ARPES studies of LaOxF1?xBiS2 (x = 0.23 and 0.46)

TMU International Symposium on "New Quantum Phases Emerging from Novel Crystal Structure"

Terashima, K.^1,2 ; Wakita, T.^1,2 ; Sunagawa, M.^1 ; Fujiwara, H.^1 ; Nagayama, T.^1 ; Ono, K.^3 ; Kumigashira, H.^3 ; Nagao, M.^4 ; Watauchi, S.^4 ; Tanaka, I.^4 ; Okazaki, H.^5 ; Takano, Y.^5 ; Mizuguchi, Y.^6 ; Usui, H.^7 ; Kuroki, K.^7 ; Muraoka, Y.^1,2 ; Yokoya, T.^1,2

Research Laboratory for Surface Science, Graduate School of Natural Science and T Echnology, Okayama University, Okayama

700-8530, Japan^1

Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama

700-8530, Japan^2

High Energy Accelerator Research Organization (KEK), Photon Factory, Ibaraki, Tsukuba

305-0801, Japan^3

Center for Crystal Science and Technology, Yamanashi University, Kofu

400-8510, Japan^4

National Institute for Materials Science, 1-2-1 Sengen, Tsukuba

305-0047, Japan^5

Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji

192-0397, Japan^6

Department of Physics, Osaka University, 1-1 Machikaneyama Toyonaka, Osaka

560-0043, Japan^7

关键词: Angle resolved photoemission spectroscopy;    Band structure calculation;    Fermi surface topology;    Lattice distortions;    Layered crystal structure;    Layered superconductor;    New superconductor;    Spectroscopic features;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/683/1/012002/pdf
DOI  :  10.1088/1742-6596/683/1/012002

来源: IOP

【 摘 要 】

BiS2-based layered superconductors are new superconductors, having been paid special attention due to the layered crystal structure and the characteristic electronic structure that can lead to exotic mechanism of superconductivity as well as cooperation of superconductivity and ordered phases. In this article, we report valence band dispersions and Fermi surface topology of LaO1-xFxBiS2(x = 0.23, Tc1-xFxBiS2(x = 0.46, Tc= 3.1 K). We discuss experimental x dependent electronic structures and its relation to Tc. We also point to anomalous spectroscopic features in LaO1-xFxBiS2(x = 0.46) that can be explained by band structure calculations considering distorted lattice, suggesting role of dynamical or static lattice distortion to the physical properties.