TY - JOUR
T1 - Granular superconductivity and phase separation in Ru1212Eu
AU - Xue, Y. Y.
AU - Lorenz, B.
AU - Baikalov, A.
AU - Cmaidaka, J.
AU - Chen, F.
AU - Meng, R. L.
AU - Chu, C. W.
N1 - Funding Information:
This work is supported in part by the National Science Foundation, the T.L.L. Temple Foundation, the John and Rebecca Moores Endowment and the State of Texas through TCSUH, and at LBNL by the US Department of Energy.
PY - 2004/8
Y1 - 2004/8
N2 - The magnetic and superconducting properties of RuSr2EuCu 2O10+δ (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and antiferromagnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phase-separation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H2 and the demagnetizing field Hdm. The data show that the FM component is along the a, b direction with a maximum Hdm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above Tc.
AB - The magnetic and superconducting properties of RuSr2EuCu 2O10+δ (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and antiferromagnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phase-separation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H2 and the demagnetizing field Hdm. The data show that the FM component is along the a, b direction with a maximum Hdm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above Tc.
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U2 - 10.1016/j.physc.2004.03.090
DO - 10.1016/j.physc.2004.03.090
M3 - Conference article
AN - SCOPUS:4344633673
SN - 0921-4534
VL - 408-410
SP - 638
EP - 640
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-4
T2 - Proceedings of the International Conference on Materials
Y2 - 25 May 2003 through 30 May 2003
ER -