Tuesday, July 16, 2013

1307.3737 (Sergey Prosandeev et al.)

Condensation of the atomic relaxation vibrations in
lead-magnesium-niobate at $T=T^*$

Sergey Prosandeev, Igor P. Raevski, Maria A. Malitskaya, Svetlana I. Raevskaya, Haydn Chen, Chen-Chia Chou, Brahim Dkhil
We present neutron diffraction, dielectric permittivity and photoconductivity measurements, evidencing that lead-magnesium niobate experiences a diffuse phase transformation between the spherical glass and quadrupole glass phases, in the temperature interval between 400 K and 500 K, with the quadrupole phase possessing extremely high magnitudes of dielectric permittivity. Our analysis shows that the integral diffuse scattering intensity may serve as an order parameter for this transformation. Our experimental dielectric permittivity data support this choice. These data are important for the aplications desiring giant dielectric responses, in a wide temperature intervals and not related to electron's excitations.
View original: http://arxiv.org/abs/1307.3737

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