Critical behavior of quasi-2D organic-inorganic halide perovskite (C6H5CH2CH2NH3)2CuCl4 single crystals

Garam Park; Jaehun Cho; June Seo Kim; Yonghwan Kim; Jong Hoon Jung; Namjung Hur; In Hwan Oh; Ki Yeon Kim

doi:10.1016/j.cap.2021.11.003

Critical behavior of quasi-2D organic-inorganic halide perovskite (C₆H₅CH₂CH₂NH₃)₂CuCl₄ single crystals

Garam Park, Jaehun Cho, June Seo Kim, Yonghwan Kim, Jong Hoon Jung, Namjung Hur, In Hwan Oh, Ki Yeon Kim

Research output: Contribution to journal › Article › peer-review

Abstract

Critical behavior of quasi two-dimensional organic-inorganic halide perovskites (C₆H₅CH₂CH₂NH₃)₂CuCl₄ is investigated using magneto-thermal and isothermal magnetic properties along the easy axis. Banerjee's criterion indicates that phase transition from paramagnetic to ferromagnetic phases below T_C = 9.4 K is of second-order. Scaling analysis reveals that critical exponent β from spontaneous magnetization in the critical region below T_C and δ from critical isotherm at T_C are found to be 0.22(3) and 9.28–9.4, close to 2D finite XY model. Meanwhile, γ from magnetic susceptibility in the critical region above T_C is gradually decreased from 2.4 at high-temperature region. Critical exponents from magneto-thermal properties are found to be consistent with those determined from magnetization isotherms. The reliability of critical values is verified using the scaling hypothesis. Our results evidence that (C₆H₅CH₂CH₂NH₃)₂CuCl₄ crossovers from isotropic 2D Heisenberg to anisotropic 3D models towards T_C and can be promising candidates for magnetocaloric materials for hydrogen reliquefaction.

Original language	English
Pages (from-to)	24-31
Number of pages	8
Journal	Current Applied Physics
Volume	35
DOIs	https://doi.org/10.1016/j.cap.2021.11.003
State	Published - Mar 2022

Bibliographical note

Publisher Copyright:
© 2021 The Authors

Keywords

2D organic-inorganic hybrids
Critical analysis
Magnetocaloric effect
Quasi-2D Heisenberg magnets
Spin crossover

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10.1016/j.cap.2021.11.003

Cite this

@article{dc02ac0cd72e411095caf7c87c804bea,

title = "Critical behavior of quasi-2D organic-inorganic halide perovskite (C6H5CH2CH2NH3)2CuCl4 single crystals",

abstract = "Critical behavior of quasi two-dimensional organic-inorganic halide perovskites (C6H5CH2CH2NH3)2CuCl4 is investigated using magneto-thermal and isothermal magnetic properties along the easy axis. Banerjee's criterion indicates that phase transition from paramagnetic to ferromagnetic phases below TC = 9.4 K is of second-order. Scaling analysis reveals that critical exponent β from spontaneous magnetization in the critical region below TC and δ from critical isotherm at TC are found to be 0.22(3) and 9.28–9.4, close to 2D finite XY model. Meanwhile, γ from magnetic susceptibility in the critical region above TC is gradually decreased from 2.4 at high-temperature region. Critical exponents from magneto-thermal properties are found to be consistent with those determined from magnetization isotherms. The reliability of critical values is verified using the scaling hypothesis. Our results evidence that (C6H5CH2CH2NH3)2CuCl4 crossovers from isotropic 2D Heisenberg to anisotropic 3D models towards TC and can be promising candidates for magnetocaloric materials for hydrogen reliquefaction.",

keywords = "2D organic-inorganic hybrids, Critical analysis, Magnetocaloric effect, Quasi-2D Heisenberg magnets, Spin crossover",

author = "Garam Park and Jaehun Cho and Kim, {June Seo} and Yonghwan Kim and Jung, {Jong Hoon} and Namjung Hur and Oh, {In Hwan} and Kim, {Ki Yeon}",

note = "Publisher Copyright: {\textcopyright} 2021 The Authors",

year = "2022",

month = mar,

doi = "10.1016/j.cap.2021.11.003",

language = "English",

volume = "35",

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journal = "Current Applied Physics",

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T1 - Critical behavior of quasi-2D organic-inorganic halide perovskite (C6H5CH2CH2NH3)2CuCl4 single crystals

AU - Park, Garam

AU - Cho, Jaehun

AU - Kim, June Seo

AU - Kim, Yonghwan

AU - Jung, Jong Hoon

AU - Hur, Namjung

AU - Oh, In Hwan

AU - Kim, Ki Yeon

PY - 2022/3

Y1 - 2022/3

N2 - Critical behavior of quasi two-dimensional organic-inorganic halide perovskites (C6H5CH2CH2NH3)2CuCl4 is investigated using magneto-thermal and isothermal magnetic properties along the easy axis. Banerjee's criterion indicates that phase transition from paramagnetic to ferromagnetic phases below TC = 9.4 K is of second-order. Scaling analysis reveals that critical exponent β from spontaneous magnetization in the critical region below TC and δ from critical isotherm at TC are found to be 0.22(3) and 9.28–9.4, close to 2D finite XY model. Meanwhile, γ from magnetic susceptibility in the critical region above TC is gradually decreased from 2.4 at high-temperature region. Critical exponents from magneto-thermal properties are found to be consistent with those determined from magnetization isotherms. The reliability of critical values is verified using the scaling hypothesis. Our results evidence that (C6H5CH2CH2NH3)2CuCl4 crossovers from isotropic 2D Heisenberg to anisotropic 3D models towards TC and can be promising candidates for magnetocaloric materials for hydrogen reliquefaction.

AB - Critical behavior of quasi two-dimensional organic-inorganic halide perovskites (C6H5CH2CH2NH3)2CuCl4 is investigated using magneto-thermal and isothermal magnetic properties along the easy axis. Banerjee's criterion indicates that phase transition from paramagnetic to ferromagnetic phases below TC = 9.4 K is of second-order. Scaling analysis reveals that critical exponent β from spontaneous magnetization in the critical region below TC and δ from critical isotherm at TC are found to be 0.22(3) and 9.28–9.4, close to 2D finite XY model. Meanwhile, γ from magnetic susceptibility in the critical region above TC is gradually decreased from 2.4 at high-temperature region. Critical exponents from magneto-thermal properties are found to be consistent with those determined from magnetization isotherms. The reliability of critical values is verified using the scaling hypothesis. Our results evidence that (C6H5CH2CH2NH3)2CuCl4 crossovers from isotropic 2D Heisenberg to anisotropic 3D models towards TC and can be promising candidates for magnetocaloric materials for hydrogen reliquefaction.

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