Single ferroelectric phase transition in tris-sarcosine calcium chloride

0579315 - FZÚ 2024 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR(CZ) GA21-06802S; GA MŠMT LM2023065
Institucionální podpora: RVO:68378271
Klíčová slova: ferroelectric * phase transition * phonons * calorimetery * spectroscopy
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.7, rok: 2022
Způsob publikování: Omezený přístup
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.
Trvalý link: https://hdl.handle.net/11104/0348158