Properties of spin-1/2 triangular-lattice antiferromagnets CuY2Ge2O8 and CuLa2Ge2O8

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Title
Properties of spin-1/2 triangular-lattice antiferromagnets CuY2Ge2O8 and CuLa2Ge2O8
Author(s)
Hwanbeom Cho; Marie Kratochvílová; Hasung Sim; Ki-Young Choi; Choong Hyun Kim; Carley Paulsen; Maxim Avdeev; Darren C. Peets; Younghun Jo; Sanghyun Lee; Yukio Noda; Michael J. Lawler; Je-Geun Park
Publication Date
2017-04
Journal
PHYSICAL REVIEW B, v.95, no.14, pp.144404 -
Publisher
AMER PHYSICAL SOC
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. © 2017 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/3541
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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Properties of spin-12 triangular-lattice antiferromagnets CuY2Ge2O8 and CuLa2Ge2O8_박제근.pdfDownload

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