Effects of Geometrical Spin Frustration on Triangular Spin Tubes Formed in CsCrF4 and \alpha-KCrF4
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概要
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We conducted X-ray diffraction, magnetic susceptibility, heat capacity, high-field magnetization, and electron spin resonance experiments on high-quality polycrystalline S=3/2 compounds consisting of equilateral and non-equilateral triangular spin tubes in CsCrF4 and \alpha-KCrF4, respectively. In both compounds, geometrical spin frustration in the triangular planes coexists with one-dimensionality along the tubes. In CsCrF4, no magnetic long-range order appeared above 1.5 K, which agrees with a prior report [H. Manaka et al.: J. Phys. Soc. Jpn. 78 (2009) 093701]. In a low temperature (T) regime, T-linear component of heat capacity appeared and magnetization curves showed finite initial slopes. As a result, CsCrF4 consists of a gapless spin-liquid state encompassing resonating spin-singlet pairs not only in each equilateral triangle but also along the tubes. In contrast, for \alpha-KCrF4, successive magnetic phase transitions occurred at T_{\text{N1}} = 2.5(1) K and at T_{\text{N2}} = 4.0(1) K because superexchange interactions through three Cr--F--Cr paths in each non-equilateral triangle lost their equilibrium.
- 2011-08-15
著者
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Kindo Koichi
Institute For Solid State Physics The University Of Tokyo
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Manaka Hirotaka
Graduate School Of Science And Engineering Kagoshima University
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Narumi Yasuo
Institute For Materials Research Tohoku University
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Kondo Akihiro
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Kindo Koichi
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Etoh Toshiya
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Honda Yuta
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Iwashita Naoki
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Ogata Kenichi
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Terada Norio
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Hisamatsu Toru
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Ito Masakazu
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Miura Yoko
Suzuka National College of Technology, Suzuka, Mie 510-0294, Japan
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KONDO Akihiro
Institute for Solid State Physics, The University of Tokyo
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