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Tuning Magnetic Coupling in Sr$_2$IrO$_4$ Thin Films with Epitaxial Strain

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arxiv 1312.4005 v2 pith:3RDAIGXJ submitted 2013-12-14 cond-mat.str-el

A. Lupascu , J. P. Clancy , H. Gretarsson , Zixin Nie , J. Nichols , J. Terzic , G. Cao , S. S. A. Seo
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Z. Islam M. H. Upton Jungho Kim A. H. Said D. Casa T. Gog Vamshi M. Katukuri H. Stoll L. Hozoi J. van den Brink Young-June Kim
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classification cond-mat.str-el
keywords magneticmathrmfilmslengthscompressivecorrelationenergyresonant
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abstract

We report x-ray resonant magnetic scattering (XRMS) and resonant inelastic x-ray scattering (RIXS) studies of epitaxially-strained $\mathrm{Sr_2IrO_4}$ thin films. The films were grown on $\mathrm{SrTiO_3}$ and $\mathrm{(LaAlO_3)_{0.3}(Sr_2AlTaO_6)_{0.7}}$ substrates, under slight tensile and compressive strains, respectively. Although the films develop a magnetic structure reminiscent of bulk $\mathrm{Sr_2IrO_4}$, 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 $\mathrm{T_N}$, 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 change in bond lengths.

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