Specific heat overcritical behaviour in (CH3NH3)5Bi2Cl11 (MAPCB) crystals

B. A. Strukov Department of Physics, Moscow State University, Moscow, Russia

R. Poprawski Institute of Physics, Technical University of Wroclaw, Wroclaw, Poland

S. A. Taraskin Department of Physics, Moscow State University, Moscow, Russia

S. V. Pavlov Department of Physics, Moscow State University, Moscow, Russia

J. Mroz Institute of Physics, Technical University of Wroclaw, Wroclaw, Poland

The results of the study of thermal properties of MAPCB crystals in the temperature interval 90-330 K are presented. Specific heat anomalies at 160 K and 307 K are revealed and discussed. It is shown that both anomalies can be described quantitatively in the phenomenological model considering the low-temperature anomaly as an overcritical “trace” of the first order isomorphic phase transition.

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Specific heat overcritical behaviour in (CH3NH3)5Bi2Cl11 (MAPCB) crystals

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