We report a muSR study of four EuBa2Cu3O6+x samples prepared with different oxygen stoichiometry (x = 0.25-0.5) and annealing temperatures. In all the samples except the least-doped one, the high-T-N anti ferromagnetic phase was found to coexist with a sizable non-magnetic fraction which, in the x greater than or equal to 0.38 samples annealed at a higher temperature, develops superconductivity with a surprisingly high T-c = 93 K. Complementary Cu-NQR investigation rules out trivial chemical inhomogeneities as the origin of the phase-separated state, and rather points to intrinsic phase separation mechanisms, such as stripe-phase instabilities.
Phase separation in superconducting EuBa2Cu3O6+x / Annese, E.; Allodi, Giuseppe; DE RENZI, Roberto; Malavasi, L.; Ghigna, P.. - In: PHYSICA. B, CONDENSED MATTER. - ISSN 0921-4526. - 326:(2003), pp. 321-324. [10.1016/S0921-4526(02)01647-2]
Phase separation in superconducting EuBa2Cu3O6+x
ALLODI, Giuseppe;DE RENZI, Roberto;
2003-01-01
Abstract
We report a muSR study of four EuBa2Cu3O6+x samples prepared with different oxygen stoichiometry (x = 0.25-0.5) and annealing temperatures. In all the samples except the least-doped one, the high-T-N anti ferromagnetic phase was found to coexist with a sizable non-magnetic fraction which, in the x greater than or equal to 0.38 samples annealed at a higher temperature, develops superconductivity with a surprisingly high T-c = 93 K. Complementary Cu-NQR investigation rules out trivial chemical inhomogeneities as the origin of the phase-separated state, and rather points to intrinsic phase separation mechanisms, such as stripe-phase instabilities.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
