Static and Dynamic Properties of the Vortices in Single Crystalline CeRu<sub><b>2</b></sub>

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  • Yoshizawa Masahito
    Department of Materials Science and Technology, Iwate University, Morioka 020
  • Tamura Manabu
    Department of Materials Science and Technology, Iwate University, Morioka 020
  • Ozawa Michihide
    Department of Materials Science and Technology, Iwate University, Morioka 020
  • Yoon Dae–Ho
    Department of Materials Science and Technology, Iwate University, Morioka 020
  • Sugawara Hitoshi
    Department of Physics, Tokyo Metropolitan University, Hachioji 192–03
  • Sato Hideyuki
    Department of Physics, Tokyo Metropolitan University, Hachioji 192–03
  • Onuki Yoshichika
    Graduate School of Science, Osaka University, Toyonaka 560 Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319–11

書誌事項

タイトル別名
  • Static and Dynamic Properties of the Vortices in Single Crystalline CeRu2.
  • Static and Dynamic Properties of the Vo

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説明

Elastic constants of CeRu2 have been measured as functions of temperature and magnetic field. The tilt elastic strain couples strongly with the vortices. The elastic anomaly Δ c due to the vortices is well described by the formula Δ c=(B2/4π)cos2θ/(1+λ2k2), where θ is the angle between the propagation of the transverse sound with the wave number k and the magnetic flux density B. By using this formula, we got the number of the pinned vortices and the coefficient λ as functions of temperature and magnetic field. The vortex state can be classified into three regions with respect of the fraction of the pinned vortices; flux-flow, strong pinning and weak pinning. The strong vortex pinning is associated with the tetragonal deformation of the lattice in the magnetic field caused by the soft (c11-c12)/2 of CeRu2, which is due to high density of states in the Brillouin zone.

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