Spin Glass State in Strained LaCaMnO Thin Films.

Epitaxial strain modifies the physical properties of thin films deposited on single-crystal substrates. In a previous work, we demonstrated that in the case of LaCaMnO thin films the strain induced by the substrate can produce the segregation of a non-ferromagnetic layer (NFL) at the top surface of ferromagnetic epitaxial LaCaMnO for a critical value of the tetragonality τ, defined as = | - |, of τ ≈ 0.024.