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Properties of spin-12triangular-lattice antiferromagnetsCuY2Ge2O8andCuLa2Ge2O8

Authors :
Marie Kratochvilova
Younghun Jo
Kiyoung Choi
Maxim Avdeev
Darren C. Peets
Sanghyun Lee
Choong H. Kim
Hasung Sim
Michael J. Lawler
Je-Geun Park
Hwanbeom Cho
Carley Paulsen
Yukio Noda
Source :
Physical Review B. 95
Publication Year :
2017
Publisher :
American Physical Society (APS), 2017.

Abstract

We found new two-dimensional (2D) quantum (S=1/2) antiferromagnetic systems: CuRE2Ge2O8 (RE=Y and La). According to our analysis of high-resolution X-ray and neutron diffraction experiments, the Cu-network of CuRE2Ge2O8 (RE=Y and La) exhibits a 2D triangular lattice linked via weak bonds along the perpendicular b-axis. Our bulk characterizations from 0.08 to 400 K show that they undergo a long-range order at 0.51(1) and 1.09(4) K for the Y and La systems, respectively. Interestingly, they also exhibit field induced phase transitions. For theoretical understanding, we carried out the density functional theory (DFT) band calculations to find that they are typical charge-transfer-type insulators with a gap of Eg = 2 eV. Taken together, our observations make CuRE2Ge2O8 (RE=Y and La) additional examples of low-dimensional quantum spin triangular antiferromagnets with the low-temperature magnetic ordering.

Details

ISSN :
24699969 and 24699950
Volume :
95
Database :
OpenAIRE
Journal :
Physical Review B
Accession number :
edsair.doi...........cf100fa9e890674db5bfa9c34e60eb90