The Magnetic Property of a Uniaxial Spin-Ladder Material Na_2Fe_2(C_2O_4)_3(H_2O)_2(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• Magnetic susceptibility, magnetization and heat capacity measurements are made on a single crystal sample of a spin-ladder material, Na_2Fe_2(C_2O_4)_3(H_2O)_2. The susceptibilities show a broad maximum at a temperature of about 25K and 20K parallel (X_‖) and perpendicular (X_⊥) to the ladder direction, respectively. The maximum value of X_‖ is about three times larger than that of X_⊥. Both X_‖ and X_⊥ decrease steeply at low temperatures down to about 5K, at which X_‖ shows an upturn. We find a broad peak in the temperature dependence of the heat capacity. Susceptibility, magnetization and heat capacity data are used to construct the magnetic field versus temperature phase diagram of this compound. Quantum fluctuations are not strong enough to form a singlet ground-state, probably due to the presence of Ising anisotropy. The actual ground state is expected to be close to the quantum critical-point between the spin-gapped and a Neel ordered phases with the help of the inter-ladder interaction.

• 社団法人日本物理学会の論文
• 2005-10-15

著者

• KATSUMATA Koichi

  RIKEN SPring-8 Center, Harima Institute

• KIKKAWA Akiko

  RIKEN SPring-8 Center

• Katsumata Koichi

  Riken Spring-8 Center Harima Institute

• HONDA Zentaro

  Faculty of Engineering, Saitama University

• YAMADA Koji

  Faculty of Engineering, Saitama University

• Honda Zentaro

  Faculty Of Engineering Saitama University

• Kikkawa Akiko

  Riken Harima Institute

• Yamada Koji

  Faculty Of Engineering Saitama University

• KATSUMATA Koichi

  RIKEN

• KATSUMATA Koichi

  RIKEN Harima Institute

• KIKKAWA Akiko

  RIKEN

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