TY - JOUR
T1 - Decoupling of the magnetic state in RuSr2Eu1.5Ce 0.5Cu2O10-δ
AU - Felner, I.
AU - Galstyan, E.
PY - 2003/8/10
Y1 - 2003/8/10
N2 - We have studied the effect of Zn substitution for Cu, on the superconducting (SC) and magnetic properties of RuSr2Eu 2-xCex(Cu1-xZnx)2O 10 (Ru-1222) for x = 0, 0.01 and 0.025. Similar to all other Zn doped HTSC materials, Zn reduces TC, from TC = 38 to 26 K for x = 0 and 0.01 respectively. The system with x = 0.025 is not SC down to 4. 2 K. On the other hand, the magnetic state of the Ru sublattice is not significantly affected by the presence or absence the SC State. Thus, the two states are practically decoupled. The wide ferromagnetic hysteresis loops which open at 5 K close themselves at elevated temperatures and the remanent magnetizations (Mrem) and the coercive fields (HC) become zero around Tirr = 80 K. Surprisingly, at Tirr < T < TM a reappearance of the Mrem and HC (with a peak at 120 K) is observed for all three samples studied. We argue that the Ru-1222 system becomes (i) Anti-ferromagnetically (AFM) ordered at T M. (ii) At Tirr < TM, weak-ferromagnetism (W-FM) is induced by the canting of the Ru moments. (iii) At TC (TM/TC ∼ 4), the system becomes SC and both SC and W-FM states coexist.
AB - We have studied the effect of Zn substitution for Cu, on the superconducting (SC) and magnetic properties of RuSr2Eu 2-xCex(Cu1-xZnx)2O 10 (Ru-1222) for x = 0, 0.01 and 0.025. Similar to all other Zn doped HTSC materials, Zn reduces TC, from TC = 38 to 26 K for x = 0 and 0.01 respectively. The system with x = 0.025 is not SC down to 4. 2 K. On the other hand, the magnetic state of the Ru sublattice is not significantly affected by the presence or absence the SC State. Thus, the two states are practically decoupled. The wide ferromagnetic hysteresis loops which open at 5 K close themselves at elevated temperatures and the remanent magnetizations (Mrem) and the coercive fields (HC) become zero around Tirr = 80 K. Surprisingly, at Tirr < T < TM a reappearance of the Mrem and HC (with a peak at 120 K) is observed for all three samples studied. We argue that the Ru-1222 system becomes (i) Anti-ferromagnetically (AFM) ordered at T M. (ii) At Tirr < TM, weak-ferromagnetism (W-FM) is induced by the canting of the Ru moments. (iii) At TC (TM/TC ∼ 4), the system becomes SC and both SC and W-FM states coexist.
UR - http://www.scopus.com/inward/record.url?scp=0141456303&partnerID=8YFLogxK
U2 - 10.1142/s0217979203021502
DO - 10.1142/s0217979203021502
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AN - SCOPUS:0141456303
SN - 0217-9792
VL - 17
SP - 3617
EP - 3621
JO - International Journal of Modern Physics B
JF - International Journal of Modern Physics B
IS - 18-20 II
ER -