Comparison of superconducting properties between FeSe0.5Te0.5/CeO2/SrTiO3 and FeSe0.5Te0.5/SrTiO3 thin films

Comparison of superconducting properties between FeSe0.5Te0.5/CeO2/SrTiO3 and FeSe0.5Te0.5/SrTiO3 thin films

The electrical resistance behaviors under angle-dependent magnetic fields up to 16 T are investigated in superconducting FeSe0.5Te0.5 (FST) thin films grown on SrTiO3 (STO) substrates without or with a CeO2 buffer layer. It is found that the FST/CeO2/STO films have an enhanced superconducting transi...

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Veröffentlicht in:Applied physics letters 2016-09, Vol.109 (12)
Hauptverfasser: Chen, S. H., Han, Y. Y., Liu, J. Z., Wang, T., Tian, M. L., Wen, H. H., Xing, Z. W.
Format: Artikel
Sprache:eng
Schlagworte:
Anisotropy
Applied physics
Buffer layers
Cerium oxides
Lattice parameters
Strontium titanates
Substrates
Superconductivity
Tellurium
Thin films
Transition temperature
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Zusammenfassung:The electrical resistance behaviors under angle-dependent magnetic fields up to 16 T are investigated in superconducting FeSe0.5Te0.5 (FST) thin films grown on SrTiO3 (STO) substrates without or with a CeO2 buffer layer. It is found that the FST/CeO2/STO films have an enhanced superconducting transition temperature T c and slightly increased superconducting anisotropy in comparison with the FST/STO films. The enhancement of T c in the presence of the CeO2 buffer is closely related to the changes in both the out-of-plane lattice constant and Se-Fe-Se (Te-Fe-Te) bond angle.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4963182