Unveiling a Family of Dimerized Quantum Magnets, Conventional Antiferromagnets, and Nonmagnets in Ternary Metal Borides

被引：2

作者：

Zhang, Zhen ^{[1
]}

Porter, Andrew P. ^{[2
,3
]}

Sun, Yang ^{[4
]}

Belashchenko, Kirill D. ^{[5
,6
]}

Viswanathan, Gayatri ^{[2
,3
]}

Sarkar, Arka ^{[2
,3
]}

Gamage, Eranga H. ^{[2
,3
]}

Kovnir, Kirill ^{[2
,3
]}

Ho, Kai-Ming ^{[1
]}

Antropov, Vladimir ^{[1
,3
]}

机构：

[1] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Chem, Ames, IA 50011 USA

[3] Ames Natl Lab, US Dept Energy, Ames, IA 50011 USA

[4] Xiamen Univ, Dept Phys, Xiamen 361005, Peoples R China

[5] Univ Nebraska Lincoln, Dept Phys & Astron, Lincoln, NE 68588 USA

[6] Univ Nebraska Lincoln, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2024年 / 146卷 / 24期

基金：

中国国家自然科学基金;

关键词：

BOSE-EINSTEIN CONDENSATION; SINGLET GROUND-STATE; X-RAY-DIFFRACTION; SPIN GAP; RARE FERRIMAGNETISM; YCRB4; LADDERS; SUPERCONDUCTIVITY; PRESSURE; EXCHANGE;

D O I：

10.1021/jacs.4c05478

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Dimerized quantum magnets are exotic crystalline materials where Bose-Einstein condensation of magnetic excitations can happen. However, known dimerized quantum magnets are limited to only a few oxides and halides. Here, we unveil 9 dimerized quantum magnets and 11 conventional antiferromagnets in ternary metal borides MTB4 (M = Sc, Y, La, Ce, Lu, Mg, Ca, and Al; T = V, Cr, Mn, Fe, Co, and Ni), where T atoms are arranged in structural dimers. Quantum magnetism in these compounds is dominated by strong antiferromagnetic (AFM) interactions between Cr (Cr and Mn for M = Mg and Ca) atoms within the dimers, with much weaker interactions between the dimers. These systems are proposed to be close to a quantum critical point between a disordered singlet spin-dimer phase, with a spin gap, and the ordered conventional Neel AFM phase. They greatly enrich the materials inventory that allows investigations of the spin-gap phase. Conventional antiferromagnetism in these compounds is dominated by ferromagnetic Mn (Fe for M = Mg and Ca) interactions within the dimers. The predicted stable and nonmagnetic (NM) YFeB4 phase is synthesized and characterized, providing a scarce candidate to study Fe dimers and Fe ladders in borides. The identified quantum, conventional, and NM systems provide a platform with abundant possibilities to tune the magnetic exchange coupling by doping and study the unconventional quantum phase transition and conventional magnetic transitions. This work opens new avenues for studying novel magnetism in borides arising from spin dimers and establishes a theoretical workflow for future searches for dimerized quantum magnets in other families of materials.

引用

页码：16878 / 16891

页数：14