Paramagnetic resonance studies in ferroelectric tris-sarcosine calcium chloride

Abstract

Dielectric, structural and nuclear magnetic resonance (nmr) properties of TSCC point at a ferroelectric transition of the order-disorder type, which may be triggered by the dynamics of the protons in the hydrogen bonds. From electron paramagnetic resonance (epr) experiments on TSCC: Mn2+ a relation between fine structure and the time average of the quasi spin variables has been found. Electron spin-echo (ese) measurements of the transverse relaxation time and epr line width investigations near transition temperature are consistent with an anisotropic Ising model of the relaxation type. The static rotation angle of the fine structure tensor correlates with the macroscopic order parameter. Its temperature dependence yields an effective critical exponent whose variation may be interpreted as the influence of order parameter fluctuations on the order of the phase transition.