Spin-1/2 Heisenberg Antiferromagnetic Chains in the Frustrated Spinel Lattice of GeCu_2O_4 : Condensed Matter: Electronic Properties, etc.

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概要

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• One-dimensional quantum antiferromagnetism has been found in a tetragonal spinel oxide, GeCu_2O_4. Actually the temperature dependence of magnetic susceptibility exhibiting a broad maximum around 80 K can be well-described as that of S = 1/2 Heisenberg antiferromagnetic chains with J/k_B = 135 K. Cooperation of spin frustration caused by the triangular arrangement of the cupric ions at octahedral sites and the Jahn-Teller elongation of the CuO_6 octahedra along the c axis seems to lead to the formation of magnetically isolated CuO_2 chains made of edge-sharing CuO_4 squares. However, a small drop in susceptibility and also a sharp spike in specific heat suggesting the occurrence of long-range antiferromagnetic ordering are observed at 33K. The effects of Si-for-Ge substitution and Mg-for-Cu substitution are also reported.

• 社団法人日本物理学会の論文
• 2000-05-15

著者

• HIROI Zenji

  Institute for Solid State Physics, University of Tokyo

• TAKANO Mikio

  Institute for Chemical Research, Kyoto University

• YAMADA Takahiro

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Yamada Takefumi

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Hiroi Zenji

  Institute For Chemical Research Kyoto University

• Takano M

  Institute For Chemical Research Kyoto University

• Takano M

  Kyoto Univ. Kyoto

• Takano Mikio

  Department Of Chemistry Faculty Of Science Konan University

• Takano Mikio

  Institute For Chemical Research (icr) Kyoto University

• TAKAGI Hidenori

  institute for Solid State Physics,University of Tokyo

• Nohara Minoru

  Institute for Solid State physics,University of Tokyo

• Nohara M

  Department Of Advanced Materials Science University Of Tokyo

• Nohara Minoru

  Graduate School Of Frontier Sciences University Of Tokyo

• Nohara Minoru

  Institute For Solid State Physics University Of Tokyo

• Mitsui Takaya

  Crest Japan Science And Technology Agency:japan Atomic Energy Agency

• Yamada T

  Japan Synchrotron Radiation Research Institute

• Hiroi Z

  Univ. Tokyo Kashiwa Jpn

• Takagi Hidenori

  Institute For Solid State Physics University Of Tokyo

• Yamada Takahiro

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• Yamada Takefumi

  Japan Synchrotron Radiation Research Institute

• YAMADA Takahiro

  Institute of Multidisciplinary for Advanced Materials, Tohoku University

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