Anisotropy of the Flux Pinning and Elastic Anomalies under High Magnetic Fields in La_<2-x>Sr_xCuO_4(High Field Superconductors)
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概要
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Temperature dependence of the sound velocity of La_<1.85>Sr_<0.15>CuO_4 single crystals has been measured in high magnetic fields up to 23 T. The anisotropy of the activation energy of the flux pinning is evaluated from the analysis of the excess elastic modulus due to the flux line lattice. The large activation energy of U(0 K, 14 T)=972 K and the small field dependence ∝H^<-0.3> are obtained for H//c-plane where the intrinsic pinning mechanism due to the layered structure is effective. The value of U rapidly decreases with increasing the tilt angle θ between H and the c-plane. The angular dependence of U is explained on the basis of the three-dimensional stepwise-flux-line structure. Moreover, elastic anomalies have been observed at T_c and near irreversibility line. The upper critical field is evaluated from the anomaly at T_c and origin of the elastic anomaly near irreversibility line is discussed.flux pinningflux line lattice elasticityultrasonic measurementLa_<2-x>Sr_xCuO_4high-T_c oxide
- 東北大学の論文
- 1996-07-15
著者
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Goto T.
Institute for Solid State Physics, University of Tokyo
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Sasaki T.
Institute for Materials Research, Tohoku University
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SUZUKI T.
Institute for Laser Science, University of Electro-Communications
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Fukase T.
Institute For Materials Research Tohoku University
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Hanaguri T.
Depertment of Pure and Applied Sciences, The University of Tokyo
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Kamata M.
Institute for Materials Research, Tohoku University
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Ishizuka K.
Institute for Materials Research, Tohoku University
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Hanaguri T.
Depertment Of Pure And Applied Sciences The University Of Tokyo
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