Noncontact dissipation reveals critical central peak in SrTiO3

Autor:	Kisiel, M., Pellegrini, F., Santoro, G. E., Samadashvili, M., Pawlak, R., Benassi, A., Gysin, U., Buzio, R., Gerbi, A., Meyer, E., Tosatti, E.
Rok vydání:	2015
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Physical Review Letters 115 046101 (2015)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.115.046101
Popis:	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. Comment: 5 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1506.01306 Zobrazit plný text záznamu View this record from Arxiv