Structure and Magnetic Properties of Melilite-Type Compounds RE2Be2GeO7 (RE = Pr, Nd, Gd-Yb) with Rare-Earth Ions on Shastry-Sutherland Lattice

被引：21

作者：

Ashtar, Malik ^{[1
,2
]}

Bai, Yuming ^{[1
,2
]}

Xu, Longmeng ^{[1
,2
]}

Wan, Zongtang ^{[1
,2
]}

Wei, Zijun ^{[1
,2
]}

Liu, Yong ^{[3
]}

Marwat, Mohsin Ali ^{[4
]}

Tian, Zhaoming ^{[1
,2
]}

机构：

[1] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

[3] Wuhan Univ, Sch Phys, Wuhan 430072, Peoples R China

[4] Huazhong Univ Sci & Technol, Coll Mat Sci & Engn, Wuhan 430074, Peoples R China

来源：

INORGANIC CHEMISTRY | 2021年 / 60卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Energy transfer - Lutetium compounds - Magnetic properties - Metal ions - Quantum theory - Antiferromagnetism - Holmium compounds - Orbits - Binary alloys - Dysprosium compounds - Germanium compounds - Superfluid helium - Isotherms - Ground state - Ytterbium compounds;

D O I：

10.1021/acs.inorgchem.0c03131

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Rare-earth (RE)-based frustrated magnets, such as typical systems of combining strong spin-orbit coupling (SOC), geometric frustration, and anisotropic exchange interaction, can give rise to diverse exotic magnetic ground states such as quantum spin liquid. The discovery of new RE-based frustrated materials is crucial for exploring the exotic magnetic phases. Herein, we report the synthesis, structure, and magnetic properties of a family of melilite-type RE2Be2GeO7 (RE = Pr, Nd, and Gd-Yb) compounds crystallized in a tetragonal P (4) over bar2(1)m structure, where magnetic RE3+ ions lay out on the Shastry-Sutherland lattice (SSL) within the ab plane and are well separated by nonmagnetic [GeBe2O7](6-) polyhedrons along the c-axis. Temperature (T)-dependent susceptibilities chi(T) and isothermal magnetization M(H) measurements reveal that most RE2Be2GeO7 compounds except RE = Tb show no magnetic ordering down to 2 K despite the dominant antiferromagnetic (AFM) interactions, where Tb2Be2GeO7 undergoes AFM transition with Neel temperature T-N similar to 2.5 K and field-induced spin flop behaviors (T < T-N). In addition, the calculated magnetic entropy change Delta S-m from the isothermal M(H) curves reveals viable magnetocaloric effect for RE2Be2GeO7 (RE = Gd and Dy) in liquid helium temperature regimes; Gd2Be2GeO7 shows the maximum Delta S-m up to 54.8 J K-1 kg(-1) at Delta H = 7 T and Dy2Be2GeO7 has the largest value Delta S-m = 16.1 J K-1 kg(-1) at Delta H = 2 T in this family. More excitingly, the rich diversity of RE ions in this family enables an archetype for exploring exotic quantum magnetic phenomena with large variability of spin located on the SSL lattice.

引用

页码：3626 / 3634

页数：9