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@ARTICLE{Kamba:22142,
      author       = {Kamba, S. and Goian, V. and Orlita, M. and Nuzhnyy, D. and
                      Lee, J. H. and Schlom, D. G. and Rushchanskii, K. Z. and
                      Lezaic, M. and Birol, T. and Fennie, C. J. and Gemeiner, P.
                      and Dkhil, B. and Bovtun, V. and Kempa, M. and Hlinka, J.
                      and Petzelt, J.},
      title        = {{M}agnetodielectric effect and phonon properties of
                      compressively strained {E}u{T}i{O}3 thin films deposited on
                      (001)({L}a{A}l{O}3)0.29-({S}r{A}l1/2{T}a1/2{O}3)0.71},
      journal      = {Physical review / B},
      volume       = {85},
      number       = {9},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-22142},
      pages        = {094435},
      year         = {2012},
      note         = {This work was supported by the Czech Science Foundation
                      (Projects No. 202/09/0682 and No. P204/12/1163). J.H. Lee
                      and D.G. Schlom were supported by the National Science
                      Foundation through the MRSEC program (Grant No.
                      DMR-1120296). T. Birol and C.J. Fennie were supported by the
                      DOE-BES under Grant No. DE-SCOO02334. Part of this work was
                      supported by the Young Investigators Group Programme of the
                      Helmholtz Association, Germany, Contract No. VH-NG-409.
                      K.Z.R. and M.L. gratefully acknowledge the support of Julich
                      Supercomputing Centre. We are grateful to E. Santava for
                      help with the magnetic measurements.},
      abstract     = {Compressively strained epitaxial (001) EuTiO3 thin films of
                      tetragonal symmetry have been deposited on (001)
                      (LaAlO3)(0.29)-(SrAl1/2Ta1/2O3)(0.71) (LSAT) substrates by
                      reactive molecular-beam epitaxy. Enhancement of the Neel
                      temperature by 1 K with $0.9\%$ compressive strain was
                      revealed. The polar phonons of the films have been
                      investigated as a function of temperature and magnetic field
                      by means of infrared reflectance spectroscopy. All three
                      in-plane polarized infrared active phonons show strongly
                      stiffened frequencies compared to bulk EuTiO3 in accordance
                      with first-principles calculations. The phonon frequencies
                      exhibit gradual softening on cooling, leading to an increase
                      in static permittivity. Additional polar phonon with
                      frequency near the TO1 soft mode was detected below 150 K.
                      This mode coupled with the TO1 mode was assigned as the
                      optical phonon from the Brillouin zone edge, which is
                      activated in infrared spectra due to an antiferrodistortive
                      phase transition and due to simultaneous presence of polar
                      and/or magnetic nanoclusters. In the antiferromagnetic
                      phase, we have observed a remarkable softening of the
                      lowest-frequency polar phonon under an applied magnetic
                      field, which qualitatively agrees with first-principles
                      calculations. This demonstrates the strong spin-phonon
                      coupling in EuTiO3, which is responsible for the pronounced
                      dependence of its static permittivity on magnetic field in
                      the antiferromagnetic phase.},
      keywords     = {J (WoSType)},
      cin          = {IAS-1 / PGI-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000302170000003},
      doi          = {10.1103/PhysRevB.85.094435},
      url          = {https://juser.fz-juelich.de/record/22142},
}