Tailoring the electronic properties of Ca$_2$RuO$_4$ via epitaxial strain

Authors :: Dietl, C.
Sinha, S. K.
Christiani, G.
Khaydukov, Y.
Keller, T.
Putzky, D.
Ibrahimkutty, S.
Wochner, P.
Logvenov, G.
van Aken, P. A.
Kim, B. J.
Keimer, B.
Source :: Appl. Phys. Lett. 112, 031902 (2018)
Publication Year :: 2017
Abstract: We report the synthesis of Ca$_2$RuO$_4$ thin films on NdCaAlO$_{4}$ (110), LaAlO$_3$ (100) and LaSrAlO$_4$ (001) substrates and show that epitaxial strain induces a transition from the Mott-insulating phase of bulk Ca$_2$RuO$_4$ into a metallic phase. Magnetometry and spin-polarized neutron reflectometry reveal a low-temperature, small-moment ferromagnetic state in metallic Ca$_2$RuO$_4$ films.