Untwinned YBa2Cu3O7−δ thin films on MgO substrates: A platform to study strain effects on the local orders in cuprates

 thin films on MgO substrates: A platform to study strain effects on the local orders in cuprates},
  author={Riccardo Arpaia and Eric Andersson and Alexei Kalaboukhov and Elsebeth Schr{\"o}der and Edoardo Trabaldo and Regina Ciancio and Goran Dra{\vz}i{\'c} and Pasquale Orgiani and Thilo Bauch and Floriana Lombardi},
  journal={Physical Review Materials},
We have grown untwinned YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) films on (110) MgO substrates that were pre-annealed at high temperature in oxygen atmosphere. The annealing results in surface reconstruction with shallow facets, which induce the suppression of the YBCO twinning domains, and the preferential alignment of the CuO chains along one of the in-plane directions of the sample. Because of the large mismatch between the in-plane lattice parameters of film and substrate, the strain induced by… 

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