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Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O,F) thin film

Published online by Cambridge University Press:  02 October 2018

J. Hänisch Open the ORCID record for J. Hänisch [Opens in a new window] ,
K. Iida ,
T. Ohmura ,
T. Matsumoto ,
T. Hatano ,
M. Langer ,
S. Kauffmann-Weiss ,
H. Ikuta  and
B. Holzapfel
J. Hänisch*
Affiliation:
Institute for Technical Physics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
K. Iida
Affiliation:
Department of Materials Physics & Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
T. Ohmura
Affiliation:
Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
T. Matsumoto
Affiliation:
Department of Materials Physics & Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
T. Hatano
Affiliation:
Department of Materials Physics & Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
M. Langer
Affiliation:
Institute for Technical Physics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
S. Kauffmann-Weiss
Affiliation:
Institute for Technical Physics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
H. Ikuta
Affiliation:
Department of Materials Physics & Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
B. Holzapfel
Affiliation:
Institute for Technical Physics, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
*
Address all correspondence to J. Hänisch at [email protected]
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Abstract

An epitaxial NdFeAs(O,F) thin film of 90 nm thickness grown by molecular beam epitaxy on MgO single crystal with Tc = 44.2 K has been investigated regarding a possible vortex glass–liquid transition. The voltage–current characteristics show excellent scalability according to the vortex-glass model with a static critical exponent ν of around 1.35 and a temperature-dependent dynamic exponent z increasing from 7.8 to 9.0 for the investigated temperature range. The large and non-constant z values are discussed in the frame of 3D vortex glass, thermally activated flux motion, and inhomogeneity broadening.

Type
Research Letters
Information
MRS Communications , Volume 8 , Issue 4 , December 2018 , pp. 1433 - 1438
Copyright
Copyright © Materials Research Society 2018 

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