Metamagnetic phase transition induced large magnetocaloric effect in a Dy0.5Ho0.5MnO3 single crystal

被引：1

作者：

Yang, Wanting ^{[1
]}

Chen, Haiyang ^{[2
]}

Peng, Haohuan ^{[1
]}

Lin, Zhaodi ^{[1
]}

Zheng, Yubing ^{[1
]}

Ma, Xiaoxuan ^{[1
]}

Jia, Rongrong ^{[1
]}

Kang, Baojuan ^{[1
]}

Feng, Zhenjie ^{[1
]}

Cao, Shixun ^{[1
,3
]}

机构：

[1] Shanghai Univ, Mat Genome Inst, Inst Quantum Sci & Technol, Dept Phys, Shanghai 200444, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Artificial Struct & Quantum Control, Minist Educ, Shanghai 200240, Peoples R China

[3] Shanghai Univ, Shanghai Key Lab High Temp Supercond, Shanghai 200444, Peoples R China

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2024年 / 26卷 / 31期

基金：

中国国家自然科学基金;

关键词：

MAGNETIC-STRUCTURES; HOMNO3; FERROELECTRICITY; MANGANITES;

D O I：

10.1039/d4cp02000f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Magnetic refrigeration based on the magnetocaloric effect is gaining interest in orthogonal or hexagonal rare-earth manganite. However, a more comprehensive understanding of the underlying mechanism is still required. We grew a high-quality single crystal of Dy0.5Ho0.5MnO3 using the optical floating zone method, since the parent crystals DyMnO3 and HoMnO3 have orthogonal and hexagonal structures, respectively. The magnetic and magnetocaloric properties and refrigeration mechanisms are thoroughly investigated. Doping modifies the magnetism according to the results obtained from the investigation of magnetic and dielectric properties and heat capacity. The spin reorientation transition shifts towards low temperature in comparison to HoMnO3. Near the N & eacute;el temperature of rare-earth sublattices (5 K), the highest changes in negative magnetic entropy under 0-70 kOe are 18 J kg(-1) K-1 and 13 J kg(-1) K-1 along the a- and c-axes, respectively. The low-temperature metamagnetic phase transition caused by the alterations in the magnetic symmetry of Ho3+ contributes to an increased magnetocaloric effect in comparison to the parent crystals, rendering it a promising choice for magnetic refrigeration applications. Dy0.5Ho0.5MnO3 exhibits a clear magnetocrystalline anisotropy with enhanced refrigeration capacity and negative magnetic entropy change along the a-axis. The adiabatic temperature change of Dy0.5Ho0.5MnO3 is 8.5 K, larger than that of HoMnO3, rendering it a promising choice for low-temperature magnetic refrigeration applications.

引用

页码：20820 / 20827

页数：8

共 43 条

[41] Dielectric and magnetocaloric study of TmCrO3 [J].