Tsuchiya Naoto, Ishinuki Tatsuya, Nakayama Yuki, Deng Xianda, Cosquer Goulven, Onimaru Takahiro, Nishihara Sadafumi, Inoue Katsuya
Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
Quantum Matter Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan.
ACS Omega. 2024 Nov 25;9(49):48748-48754. doi: 10.1021/acsomega.4c08297. eCollection 2024 Dec 10.
Two-dimensional organic-inorganic perovskites have been attracted as candidates for multiferroic materials that exhibit two or more ferroic orders such as ferromagnetism, ferroelectricity, ferroelasticity, and ferrotoroidicity. Here, we introduce the structure, ferroelastic domains and magnetic properties of the two-dimensional organic-inorganic perovskite [CH(CH)NH]FeCl (CHEA-Fe) composed of 2-(1-cyclohexenyl)ethylammonium and FeCl . CHEA-Fe underwent two ferroelastic phase transitions from tetragonal to orthorhombic at 332 K and to monoclinic at 232 K with decreasing temperature and exhibited ferroelastic domains under polarized light as a consequence of these ferroelastic phase transitions. Magnetization measurements exhibited two magnetization jumps at the transition temperature, which agrees with ferroelastic phase transitions. Furthermore, CHEA-Fe acted as canted antiferromagnetism below = 85.7 K. The isothermal magnetization revealed a magnetic hysteresis when the magnetic field was applied along the stacking axis of the layers.
二维有机-无机钙钛矿作为多铁性材料的候选者受到关注，这类材料表现出两种或更多种铁性序，如铁磁性、铁电性、铁弹性和铁环电性。在此，我们介绍由2-(1-环己烯基)乙铵和FeCl组成的二维有机-无机钙钛矿[CH(CH)NH]FeCl（CHEA-Fe）的结构、铁弹畴和磁性。随着温度降低，CHEA-Fe在332 K时经历了从四方相到正交相以及在232 K时从正交相到单斜相的两次铁弹相变，并且由于这些铁弹相变，在偏振光下呈现出铁弹畴。磁化测量在转变温度处显示出两次磁化跃变，这与铁弹相变相符。此外，在T = 85.7 K以下，CHEA-Fe表现为倾斜反铁磁性。等温磁化在磁场沿层的堆叠轴施加时显示出磁滞现象。
