High temperature superconducting FeSe films on SrTiO(3) substrates

Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting properties of ultra-thin FeSe films with the thickness of one unit cell (1-UC) grown on conductive and insulating SrTiO...

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Detalles Bibliográficos
Autores principales: Sun, Yi, Zhang, Wenhao, Xing, Ying, Li, Fangsen, Zhao, Yanfei, Xia, Zhengcai, Wang, Lili, Ma, Xucun, Xue, Qi-Kun, Wang, Jian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4129414/
https://www.ncbi.nlm.nih.gov/pubmed/25113391
http://dx.doi.org/10.1038/srep06040
Descripción
Sumario:Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting properties of ultra-thin FeSe films with the thickness of one unit cell (1-UC) grown on conductive and insulating SrTiO(3) (STO) substrates. For the 1-UC FeSe on conductive STO substrate (Nb-STO), the magnetization versus temperature (M-T) measurement shows a drop crossover around 85 K. For the FeSe films on insulating STO substrate, systematic transport measurements were carried out and the sheet resistance of FeSe films exhibits Arrhenius TAFF behavior with a crossover from a single-vortex pinning region to a collective creep region. More intriguing, sign reversal of Hall resistance with temperature is observed, demonstrating a crossover from hole conduction to electron conduction above T(C) in 1-UC FeSe films.

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