Phys. Rev. B 57, R14080–R14083 (1998)

Local voltage-current characteristics in high-T_c superconductors

Abstract

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D. Giller, Y. Abulafia, R. Prozorov, Y. Wolfus, A. Shaulov, and Y. Yeshurun
Institute of Superconductivity, Department of Physics, Bar Ilan University, Ramat Gan, 52900 Israel

Received 7 January 1998; revised 3 March 1998; published in the issue dated 1 June 1998

Local electric field versus current density (E-j) curves were measured in YBa₂Cu₃O_7-δ and Nd_1.85Ce_0.15CuO_4-δ single crystals using a miniature Hall-sensors array. Measurements in the field range corresponding to the anomalous magnetization peak in these crystals reveal remarkably different E-j characteristics below and above the peak, indicating a crossover in the flux-creep mechanism. Similar E-j behavior, as observed here in YBa₂Cu₃O_7-δ and Nd_1.85Ce_0.15CuO_4-δ, is expected universally in every superconductor exhibiting the anomalous peak.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.57.R14080

DOI:

10.1103/PhysRevB.57.R14080

PACS:

74.60.-w, 74.72.-h, 74.25.Ha, 74.60.Ge

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Phys. Rev. B 57, R14080–R14083 (1998)

Local voltage-current characteristics in high-Tc superconductors

Local voltage-current characteristics in high-T_c superconductors