https://doi.org/10.1140/epjb/e2007-00077-7
Effect of the substrate ferroelastic transition on epitaxial La0.7Sr0.3MnO3 films grown on LaAlO3
1
Dipartimento di Fisica, Università di Cagliari and CNISM, S.P. Monserrato-Sestu km 0.700, 09042 Monserrato (CA), Italy
2
INFM “Coherentia” and INFM-UdR di Salerno, Dipartimento di Fisica, Università di Salerno, via S. Allende, 84081 Baronissi (SA), Italy
3
Coherentia CNR-INFM and Dipartimento di Ingegneria Meccanica, Università di Roma “TorVergata”, via del Politecnico 1, 00133 Roma, Italy
Corresponding author: a maritato@sa.infn.it
Received:
19
June
2006
Revised:
20
November
2006
Published online:
22
March
2007
Thin films of La0.7Sr0.3MnO3 were grown by
molecular beam epitaxy on (001)LaAlO3 crystals. High resolution X-ray
diffraction analysis proves the presence of twins in the films at room
temperature, showing that the twin structure of the substrate which forms at
the ferroelastic transition at TF = 813 K
served as a template for the film microstructure. Magnetic measurements
indicate a thermomagnetic irreversibility which is ascribed to the quenched
disorder related to twinning and discussed in terms of coexisting
ferromagnetic and spin disordered regions connected with the undeformed
domain cores and strained domain walls respectively.
PACS: 75.47.Gk – Colossal magnetoresistance / 73.50.-h – Electronic transport phenomena in thin films
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007