Tuning Magnetic Coupling inSr2IrO4Thin Films with Epitaxial Strain Academic Article uri icon

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abstract

  • 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.

authors

  • Clancy, Pat
  • Lupascu, A
  • Clancy, JP
  • Gretarsson, H
  • Nie, Zixin
  • Nichols, J
  • Terzic, J
  • Cao, G
  • Seo, SSA
  • Islam, Z
  • Upton, MH
  • Kim, Jungho
  • Casa, D
  • Gog, T
  • Said, AH
  • Katukuri, Vamshi M
  • Stoll, H
  • Hozoi, L
  • van den Brink, J
  • Kim, Young-June

publication date

  • April 11, 2014