Untwinned YBa2Cu3O7-delta thin films on MgO substrates: A platform to study strain effects on the local orders in cuprates
Artikel i vetenskaplig tidskrift, 2019

We have grown untwinned YBa2Cu3O7-delta (YBCO) films on (110) MgO substrates that were preannealed 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 substrate. Because of the large mismatch between the in-plane lattice parameters of film and substrate, the strain induced by the MgO into the YBCO layer is strong and very peculiar. The YBCO film is compressed, with respect to the bulk, and presents a unidirectional buckling of the atomic planes, along the chains' direction, due to a deformation of the copper-oxygen octahedra. The YBCO films, which can be grown with thicknesses down to few unit cells and oxygen doping levels spanning most of the superconducting dome, are patterned into nanowires with dimensions down to 50 nm. The anisotropies due to the untwinning state are preserved in these structures; moreover, additional anisotropies appear in ultrathin structures where strain effects become more pronounced. Such untwinned and compressively strained films can therefore be used as a platform to study the interplay between strain and the various local orders in the normal state of YBCO.

Författare

Riccardo Arpaia

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Politecnico di Milano

Eric Andersson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Alexei Kalaboukhov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Elsebeth Schröder

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Edoardo Trabaldo

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Regina Ciancio

CNR IOM TASC Lab

Goran Drazic

Natl Inst Chem

Pasquale Orgiani

Universita degli Studi di Salerno

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physical Review Materials

2475-9953 (eISSN)

Vol. 3 11 114804

Ämneskategorier

Oorganisk kemi

Annan materialteknik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevMaterials.3.114804

Mer information

Senast uppdaterat

2020-01-08