Local magnetic order in superconducting YBa2(Cu1−xMx)3O7 (M=Co,Fe)

C. Vaast; J. A. Hodges; P. Bonville; A. Forget

doi:10.1103/PhysRevB.56.7886

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Local magnetic order in superconducting YBa2(Cu1−xMx)3O7 (M=Co,Fe)

C. Vaast, J. A. Hodges, P. Bonville, A. Forget

DOI 10.1103/PhysRevB.56.7886 · Physical Review B

T1

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Abstract

We have examined the local magnetic order which is introduced into YBa2Cu3O7 by substituting low levels (1–4 %) of Co or Fe. The order is evidenced through the appearance of an internal field on the spin of 170Yb3+ Mössbauer probes diluted at the Y3+ sites. Low substitution levels only marginally influence the superconducting properties, yet introduce local magnetic order over the whole sample volume. The local order concerns the Cu sublattices and fluctuates with rates that depend on the substituted ion, its concentration, and the temperature.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2(Cu0.98Co0.02)3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	84	Pressure unresolved	unknown
YBa2(Cu0.96Co0.04)3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	68	Pressure unresolved	unknown
YBa2(Cu0.96Fe0.04)3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	70	Pressure unresolved	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown