Noncontact dissipation reveals critical central peak in SrTiO3

M. Kisiel; F. Pellegrini; G. E. Santoro; M. Samadashvili; R. Pawlak; A. Benassi; U. Gysin; R. Buzio; A. Gerbi; E. Meyer; E. Tosatti

doi:10.1103/PhysRevLett.115.046101

Noncontact dissipation reveals critical central peak in SrTiO3

Mesoscale and Nanoscale Physics 2015-09-02 v1

Authors: M. Kisiel , F. Pellegrini , G. E. Santoro , M. Samadashvili , R. Pawlak , A. Benassi , U. Gysin , R. Buzio , A. Gerbi , E. Meyer , E. Tosatti

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Abstract

The critical fluctuations at second order structural transitions in a bulk crystal may affect the dissipation of mechanical probes even if completely external to the crystal surface. Here we show that noncontact force microscope dissipation bears clear evidence of the antiferrodistortive phase transition of SrTiO3, known for a long time to exhibit a unique, extremely narrow neutron scattering "central peak". The noncontact geometry suggests a central peak linear response coupling connected with strain. The detailed temperature dependence reveals for the first time the intrinsic central peak width of order 80 kHz, two orders of magnitude below the established neutron upper bound.

Keywords

SrTiO3 central peak antiferrodistortive phase transition noncontact dissipation force microscopy strain coupling critical fluctuations

Cite

@article{arxiv.1506.01306,
  title  = {Noncontact dissipation reveals critical central peak in SrTiO3},
  author = {M. Kisiel and F. Pellegrini and G. E. Santoro and M. Samadashvili and R. Pawlak and A. Benassi and U. Gysin and R. Buzio and A. Gerbi and E. Meyer and E. Tosatti},
  journal= {arXiv preprint arXiv:1506.01306},
  year   = {2015}
}

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5 pages, 3 figures

Noncontact dissipation reveals critical central peak in SrTiO3

Abstract

Keywords

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