Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.046101
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Funding
- Swiss National Science Foundation (SNSF)
- SINERGIA Project [CRSII2 136287/1]
- Swiss National Center of Competence in Research on Nanoscale Science (NCCR-NANO)
- MIUR [PRIN-2010LLKJBX_001]
- SNSF [CRSII2 136287/1]
- European Research Council (ERC) [320796 MODPHYSFRICT]
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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, 2 orders of magnitude below the established neutron upper bound.
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