Single-Crystal Growth and Thermal Conductivity of the Four-Leg Spin-Ladder System La2Cu2O5

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  • Kudo Kazutaka
    Department of Applied Physics, Graduate School of Engineering, Tohoku University
  • Noji Takashi
    Department of Applied Physics, Graduate School of Engineering, Tohoku University
  • Koike Yoji
    Department of Applied Physics, Graduate School of Engineering, Tohoku University
  • Nishizaki Terukazu
    Institute for Materials Research (IMR), Tohoku University
  • Kobayashi Norio
    Institute for Materials Research (IMR), Tohoku University

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  • Single-Crystal Growth and Thermal Conductivity of the Four-Leg Spin–Ladder System La<sub>2</sub>Cu<sub>2</sub>O<sub>5</sub>

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We have succeeded in growing large-size single-crystals of the four-leg spin–ladder system La2Cu2O5 by the traveling-solvent floating-zone method, and also investigated the thermal conductivity. The thermal conductivity along the leg of the ladder, κb, has been found to be much larger than that perpendicular to the ladder plane, κa. The temperature dependence of κb exhibits a peak at 22 K and a shoulder at 12 K. The peak is a little enhanced by the application of a magnetic field of 14 T. The large value of κb is explained as being due to the large contribution of magnons to the thermal conductivity.

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