Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2

Y. Mizuguchi; K. Deguchi; S. Tsuda; T. Yamaguchi; Y. Takano

doi:10.1209/0295-5075/90/57002

All issues

Volume 90 / No 5 (June 2010)

EPL, 90 5 (2010) 57002

Abstract

Issue		EPL Volume 90, Number 5, June 2010


Article Number		57002
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/90/57002
Published online		30 June 2010

EPL, 90 (2010) 57002

Evolution of superconductivity by oxygen annealing in FeTe_0.8S_0.2

Y. Mizuguchi¹^,2^,3, K. Deguchi¹^,2^,3, S. Tsuda¹^,2, T. Yamaguchi¹^,2 and Y. Takano¹^,2^,3

¹ National Institute for Materials Science - 1-2-1 Sengen, Tsukuba 305-0047, Japan
² JST, TRIP - 1-2-1 Sengen, Tsukuba 305-0047, Japan
³ University of Tsukuba - 1-1-1 Tennodai, Tsukuba 305-0001, Japan

Corresponding author: MIZUGUCHI.Yoshikazu@nims.go.jp

Received: 13 March 2010
Accepted: 1 June 2010

Abstract

Oxygen annealing dramatically improved the superconducting properties of solid-state–reacted FeTe_0.8S_0.2, which showed only a broad onset of superconducting transition just after the synthesis. The zero resistivity appeared and the transition temperature T_c^zero reached 8.5 K by the oxygen annealing at 200 °C. The shielding volume fraction was also enhanced from 0 to almost 100%. The lattice constants were compressed by the oxygen annealing, indicating that the evolution of bulk superconductivity in FeTe_0.8S_0.2 was correlated to the shrinkage of the lattice.

PACS: 74.70.-b – Superconducting materials other than cuprates / 74.62.Dh – Effects of crystal defects doping and substitution / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition

© EPLA, 2010

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