A pyroxene-based quantum magnet with multiple magnetization plateaus

被引：0

作者：

Jin, Lun ^{[1
]}

Peng, Shiyu ^{[2
]}

Rutherford, Aya Nakano ^{[3
]}

Xu, Xianghan ^{[1
]}

Ni, Danrui ^{[1
]}

Yang, Chen ^{[1
]}

Byeon, Yen Ji ^{[1
]}

Xie, Weiwei ^{[4
]}

Zhou, Haidong ^{[3
]}

Dai, Xi ^{[2
]}

Cava, Robert J. ^{[1
]}

机构：

[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[2] Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China

[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[4] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

来源：

SCIENCE ADVANCES | 2024年 / 10卷 / 41期

关键词：

CRYSTAL-STRUCTURE; SPIN STRUCTURE; CACOSI2O6; TEMPERATURE;

D O I：

10.1126/sciadv.adp4685

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Pyroxenes (AMX(2)O(2)) consisting of infinite one-dimensional edge-sharing MO(6 )chains and bridging XO4 tetrahedra are fertile ground for finding quantum materials. Thus, here, we have studied calcium cobalt germanate (CaCoGe2O6 ) and calcium cobalt silicate (CaCoSi(2)O6) crystals in depth. Heat capacity data show that the spins in both compounds are dominantly Ising-like, even after being manipulated by high magnetic fields. On cooling below the N & eacute;el temperatures, a sharp field-induced transition in magnetization is observed for CaCoGe2O6 , while multiple magnetization plateaus beneath the full saturation moment are spotted for CaCoSi2O6 . Our analysis shows that these contrasting behaviors potentially arise from the different electron configurations of germanium and silicon, in which the 3d orbitals are filled in the former but empty in the latter, enabling electron hopping. Thus, silicate tetrahedra can aid the interchain superexchange pathway between cobalt(II) ion centers, while germanate ones tend to block it during magnetization.

引用

页数：9