Interconnection between zero resistance and magnetic irreversibility temperatures in the hole doped Y0.9Ca0.1Ba2Cu3O7-δ single crystal

• Published in: Journal of physics. Conference series Vol. 568; no. 2
• Main Authors: Macedo, D G, Vieira, V N, Dias, F T, da Silva, D L, Jaeckel, S, Pureur, P, Schaf, J
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.01.2014
• Subjects: Magnetometers; Magnetoresistance; Magnetoresistivity; Physics; Single crystals; Superconducting quantum interference devices; Superconductivity
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/568/2/022016

We report on ac magnetoresistance, R(T,H) and ZFC [MZFC(T)] and FCC [MFCC(T)] dc magnetizations measurements of the a hole doped Y0.9Ca0.1Ba2Cu3O7-δ single crystal with the propose of to disclose the correlation between the zero resistance, TR0(H) and the magnetic irreversibility, Tirr(H) temperatures. The R(T,H) measurements were performed with a PPMS with the measurement current density applied parallel to the sample ab plane. The MZFC(T) and MFCC(T) measurements were performed with a commercial SQUID magnetometer. For the both measurements H ≤ 50kOe were applied parallel to the c axis of the sample. The contrasting of the Tirr(H) and TR0(H) data profile at H-T diagram shows that for H ≤ 5kOe the TR0(H) data falls systematically underneath of the Tirr(H) data and for H > 5kOe the TR0(H) data matches to the Tirr(H) data. We attributed to the establishment of a superconducting granular scenario provided for Ca doping as responsible for the observation of these features. At this scenario, Tirr(H) and TR0(H) do not depend of the same parts of the sample. While the Tirr(H) depends on well coupled grain clusters the TR0(H) depends on grain arrays traversing the whole sample. The granular aspect of this result is discussed at the light of the superconducting glass theories.