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Anisotropy of the flux pinning in La1.85Sr0.15CuO4 observed by ultrasound

โœ Scribed by Tetsuo Hanaguri; Tetsuo Fukase; Isao Tanaka; Hironao Kojima

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
165 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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โœฆ Synopsis

An increase of the sound velocity reflecting the elastic constant of the flux line lattice and its pinning are observed in the mixed states of a La1.ssSro.15Cu04 single crystal. Each anisotropic activation energy which is necessary to depin the flux line lattice is evaluated independently from measurements under various settings of the wave vector k, the polarization vector u and magnetic fields H using the analysis based on the thermally assisted flux flow model. It is found that the activation energy in the case of H_Lc-axis and ullc-axis is extremely higher than others. This result suggests the importance of the intrinsic pinning mechanism due to the layer structure.

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