IMF2017

Quantum phase transitions occur in the halide salts of tris­sarcosine. Substitution of bromine or iodine for chlorine in (CH₃NHCH₂COOH)₃CaCl₂, (TSCC), suppresses the Curie temperature, T _C, from 130 K to 0 K at which point a zero tem­perature phase transition occurs between a ferroelectric and a paraelectric state as the doping level is varied.The ferroelec­tric transition in TSCC is observed to be second order in all experiments carried out so far, an uncommon feature among ferroelectrics, which implies that the zero temperature tran­sition is likely to be a quantum critical point (QCP) with quantum fluctuations persisting over a range of temperatures and doping levels.