Fluctuation conductivity in NdBa/sub 2/Cu/sub 3/O/sub y/ superconductors with the different amounts of 422 phase

Sato, Toshiharu; Nakane, Hiroshi; Môri, N.; Yoshizawa, Shuji

doi:10.1109/tasc.2003.812121

Cited by 2 publications

(1 citation statement)

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“…22,23 Despite of the primary reports about RE-123 systems, behavior of 1D conduction for Nd-123 and Y-123 samples was also observed at high temperature. 23,24 Furthermore an intermediate region between 2D and 3D has also been reported for Y-123 superconductor. 22 The appearance of the 1D fluctuation in superconductivity of cuprates would have a significant effect on our understanding of the superconducting process in these materials.…”

Section: Results and Analysesmentioning

confidence: 61%

EXCESS FLUCTUATION CONDUCTIVITY AND SUPERCONDUCTING PARAMETERS OF CaLa-DOPED Nd-123

Ghorbani

Homaei

2011

Mod. Phys. Lett. B

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Polycrystalline samples of Nd 1-x Ca x Ba 2-x La x Cu 3 O 7-δ (with 0.0 ≤ x ≤ 0.15) were prepared by the standard solid state method. The co-doping effect was studied on the resistivity as a function of temperature and doping concentration x. The fluctuation conductivity was analyzed using the Aslamazov and Larkin model (AL). For all samples, three fluctuation regions; i.e. one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D), were clearly observed with decreasing temperature. A critical region was also observed for high doping concentration (x ≥ 0.1). Superconductivity parameters such as the effective coherence length ξ p , the coherence length along the c-axis ξ c and ab plane ξ ab , the effective interlayer separation d, anisotropy parameter γ a , and the upper critical magnetic field B c2 along the c-axis and ab plane were obtained. It was also found that CuO x chains contribute to conducting.

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