Anomalous enhancement of upper critical field in Sr2RuO4 thin films

  title={Anomalous enhancement of upper critical field in 
 thin films},
  author={Masaki Uchida and Motoharu Ide and Minoru Kawamura and K. S. Takahashi and Yusuke Kozuka and Yoshinori Tokura and Masashi Kawasaki},
  journal={Physical Review B},
We report large enhancement of upper critical field Hc2 observed in superconducting Sr2RuO4 thin films. Through dimensional crossover approaching two dimensions, Hc2 except the in-plane field direction is dramatically enhanced compared to bulks, following a definite relation distinct from bulk one between Hc2 and the transition temperature. The anomalous enhancement of Hc2 is highly suggestive of important changes of the superconducting properties, possibly accompanied with rotation of the… 
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