The influence of the in-plane lattice constant on the superconducting transition temperature of FeSe0.7Te0.3 thin films

Feifei Yuan; Kazumasa Iida; Vadim Grinenko; Paul Chekhonin; Aurimas Pukenas; Werner Skrotzki; Masahito Sakoda; Michio Naito; Alberto Sala; Marina Putti; Aichi Yamashita; Yoshihiko Takano; Zhixiang Shi; Kornelius Nielsch; Ruben Hühne

doi:10.1063/1.4989566

AIP Advances (Jun 2017)

The influence of the in-plane lattice constant on the superconducting transition temperature of FeSe0.7Te0.3 thin films

Feifei Yuan,
Kazumasa Iida,
Vadim Grinenko,
Paul Chekhonin,
Aurimas Pukenas,
Werner Skrotzki,
Masahito Sakoda,
Michio Naito,
Alberto Sala,
Marina Putti,
Aichi Yamashita,
Yoshihiko Takano,
Zhixiang Shi,
Kornelius Nielsch,
Ruben Hühne

Affiliations

Feifei Yuan: Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, People’s Republic of China
Kazumasa Iida: Department of Materials Physics, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
Vadim Grinenko: Institute for Metallic Materials, IFW Dresden, D-01069 Dresden, Germany
Paul Chekhonin: Institute for Metallic Materials, IFW Dresden, D-01069 Dresden, Germany
Aurimas Pukenas: Institute of Structural Physics, Dresden University of Technology, 01062 Dresden, Germany
Werner Skrotzki: Institute of Structural Physics, Dresden University of Technology, 01062 Dresden, Germany
Masahito Sakoda: Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
Michio Naito: Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
Alberto Sala: Dipartimento di Fisica, Università di Genova and CNR-SPIN, Via Dodecaneso 33, I-16146 Genova, Italy
Marina Putti: Dipartimento di Fisica, Università di Genova and CNR-SPIN, Via Dodecaneso 33, I-16146 Genova, Italy
Aichi Yamashita: National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
Yoshihiko Takano: National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
Zhixiang Shi: Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, People’s Republic of China
Kornelius Nielsch: Institute for Metallic Materials, IFW Dresden, D-01069 Dresden, Germany
Ruben Hühne: Institute for Metallic Materials, IFW Dresden, D-01069 Dresden, Germany

DOI: https://doi.org/10.1063/1.4989566
Journal volume & issue: Vol. 7, no. 6
pp. 065015 – 065015-6

Abstract

Read online

Epitaxial Fe(Se,Te) thin films were prepared by pulsed laser deposition on (La0.18Sr0.82)(Al0.59Ta0.41)O3 (LSAT), CaF2-buffered LSAT and bare CaF2 substrates, which exhibit an almost identical in-plane lattice parameter. The composition of all Fe(Se,Te) films were determined to be FeSe0.7Te0.3 by energy dispersive X-ray spectroscopy, irrespective of the substrate. Albeit the lattice parameters of all templates have comparable values, the in-plane lattice parameter of the FeSe0.7Te0.3 films varies significantly. We found that the superconducting transition temperature (Tc) of FeSe0.7Te0.3 thin films is strongly correlated with their a-axis lattice parameter. The highest Tc of over 19 K was observed for the film on bare CaF2 substrate, which is related to unexpectedly large in-plane compressive strain originating mostly from the thermal expansion mismatch between the FeSe0.7Te0.3 film and the substrate.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

About the journal