Superconductivity in La1−xCex OBiSSe: Carrier doping by mixed valence of Ce ions

Ryota Sogabe; Yosuke Goto; Atsuhiro Nishida; Takayoshi Katase; Yoshikazu Mizuguchi

doi:10.1209/0295-5075/122/17004

All issues

Volume 122 / No 1 (April 2018)

EPL, 122 1 (2018) 17004

Abstract

Issue		EPL Volume 122, Number 1, April 2018


Article Number		17004
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/122/17004
Published online		05 June 2018

EPL, 122 (2018) 17004

Superconductivity in La_1−xCe_x OBiSSe: Carrier doping by mixed valence of Ce ions

Ryota Sogabe¹, Yosuke Goto¹^(a), Atsuhiro Nishida¹, Takayoshi Katase²^,3 and Yoshikazu Mizuguchi¹

¹ Department of Physics, Tokyo Metropolitan University - Hachioji 192-0397, Japan
² Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan
³ PRESTO, Japan Science and Technology Agency - 7 Gobancho, Chiyoda, Tokyo, 102-0076, Japan

^(a) y_goto@tmu.ac.jp

Received: 20 March 2018
Accepted: 11 May 2018

Abstract

We report the effects of Ce substitution on the structural, electronic, and magnetic properties of the layered bismuth-chalcogenide La_1−xCe_xOBiSSe $(x = 0\text{--}0.9)$ , which are newly obtained in this study. Metallic conductivity was observed for $x \ge 0.1$ because of electron carriers induced by mixed valence of Ce ions, as revealed by the bond valence sum calculation and magnetization measurements. Zero resistivity and clear diamagnetic susceptibility were obtained for $x=0.2\text{--}0.6$ , indicating the emergence of bulk superconductivity in these compounds. Dome-shaped superconductivity phase diagram with the highest transition temperature $(T_{\mathrm{c}})$ of 3.1 K, which is slightly lower than that of F-doped LaOBiSSe $(T_{\mathrm{c}}=3.7\ \text{K})$ , was established. The present study clearly shows that the mixed valence of Ce ions can be utilized as an alternative approach for electron-doping in layered bismuth-chalcogenides to induce superconductivity.

PACS: 74.25.F- – Transport properties / 74.25.Dw – Superconductivity phase diagrams / 72.15.-v – Electronic conduction in metals and alloys

© EPLA, 2018

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