Title :
The origin of resistance peak effect in high-temperature superconductors-apparent Tc anisotropy due to Jc anisotropy
Author :
Buzea, Cristina ; Tachiki, Takashi ; Nakajima, Kensuke ; Yamashita, Tsutomu
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
We analysed the resistance peak effect exhibited by La1.85 Sr0.15CuO4(100) thin films, consisting of a peak just above Tc in the resistance versus temperature curves, similar peaks have been observed in intrinsic or artificially layered high- and low-Tc superconductors in a four-point contact configuration. Though several explanations have been proposed, the physical origin of this anomaly is still not understood. In this paper we show that the apparent Tc anisotropy which generates the peak may be accounted by different electrical transport mechanisms along a- and c-axis, i.e. critical current anisotropy
Keywords :
critical current density (superconductivity); electrical resistivity; high-temperature superconductors; lanthanum compounds; strontium compounds; superconducting thin films; superconducting transition temperature; La1.85Sr0.15CuO4; La1.85Sr0.15CuO4(100) thin films; critical current density anisotropy; electrical transport mechanisms; four-point contact configuration; high-temperature superconductors; resistance peak effect; transition temperature anisotropy; Anisotropic magnetoresistance; Communication industry; Contacts; Electric resistance; Electrical resistance measurement; High temperature superconductors; Materials science and technology; Superconducting materials; Superconducting transition temperature; Superconductivity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
