TY - JOUR
T1 - Tuning magnetic coupling in Sr2IrO4 thin films with epitaxial strain
AU - Lupascu, A.
AU - Clancy, J. P.
AU - Gretarsson, H.
AU - Nie, Zixin
AU - Nichols, J.
AU - Terzic, J.
AU - Cao, G.
AU - Seo, S. S.A.
AU - Islam, Z.
AU - Upton, M. H.
AU - Kim, Jungho
AU - Casa, D.
AU - Gog, T.
AU - Said, A. H.
AU - Katukuri, Vamshi M.
AU - Stoll, H.
AU - Hozoi, L.
AU - Van Den Brink, J.
AU - Kim, Young June
PY - 2014/4/7
Y1 - 2014/4/7
N2 - We report x-ray resonant magnetic scattering and resonant inelastic x-ray scattering studies of epitaxially strained Sr2IrO4 thin films. The films were grown on SrTiO3 and (LaAlO3)0.3(Sr2AlTaO6)0.7 substrates, under slight tensile and compressive strains, respectively. Although the films develop a magnetic structure reminiscent of bulk Sr2IrO4, the magnetic correlations are extremely anisotropic, with in-plane correlation lengths significantly longer than the out-of-plane correlation lengths. In addition, the compressive (tensile) strain serves to suppress (enhance) the magnetic ordering temperature TN, while raising (lowering) the energy of the zone-boundary magnon. Quantum chemical calculations show that the tuning of magnetic energy scales can be understood in terms of strain-induced changes in bond lengths.
AB - We report x-ray resonant magnetic scattering and resonant inelastic x-ray scattering studies of epitaxially strained Sr2IrO4 thin films. The films were grown on SrTiO3 and (LaAlO3)0.3(Sr2AlTaO6)0.7 substrates, under slight tensile and compressive strains, respectively. Although the films develop a magnetic structure reminiscent of bulk Sr2IrO4, the magnetic correlations are extremely anisotropic, with in-plane correlation lengths significantly longer than the out-of-plane correlation lengths. In addition, the compressive (tensile) strain serves to suppress (enhance) the magnetic ordering temperature TN, while raising (lowering) the energy of the zone-boundary magnon. Quantum chemical calculations show that the tuning of magnetic energy scales can be understood in terms of strain-induced changes in bond lengths.
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U2 - 10.1103/PhysRevLett.112.147201
DO - 10.1103/PhysRevLett.112.147201
M3 - Article
AN - SCOPUS:84898467333
SN - 0031-9007
VL - 112
JO - Physical Review Letters
JF - Physical Review Letters
IS - 14
M1 - 147201
ER -