Single ferroelectric phase transition in tris-sarcosine calcium chloride

0579315 - FZÚ 2024 RIV US eng J - Journal Article
Goian, Veronica - Borodavka, Fedir - Repček, Dalibor - Savinov, Maxim - Míšek, Martin - Kaštil, Jiří - Skoromets, Volodymyr - Ondrejkovič, Petr - Petzelt, Jan - Hlinka, Jiří - Kužel, Petr - Kamba, Stanislav
Single ferroelectric phase transition in tris-sarcosine calcium chloride.
Physical Review B. Roč. 108, č. 22 (2023), č. článku 224101. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA ČR(CZ) GA21-06802S; GA MŠMT LM2023065
Institutional support: RVO:68378271
Keywords : ferroelectric * phase transition * phonons * calorimetery * spectroscopy
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.108.224101

o solve the long-standing controversy over the number of ferroelectric phase transitions in (CH3NHCH2COOH)3CaCl2, we performed a comprehensive series of new dielectric, second-harmonic generation(SHG), calorimetric, IR, and Raman measurements down to 10 K. Detailed analysis of the data excludes other ferroelectric transitions than the one at TC = 130 K from the Pnma to Pn21a orthorhombic space groups. We found a weak and strongly frequency-dependent dielectric anomaly in the radiofrequency permittivity close to 65 K, where the second phase transition was previously suggested. This behavior is assigned to the domain wall dynamics. Temperature dependences of the spontaneous polarization, heat capacity, and SHG signal show no indication of any further phase transition below TC.
Permanent Link: https://hdl.handle.net/11104/0348158