Indication of high local fields in the YBa2Cu2.9375Fe0.0625Oδ superconductor by Mössbauer spectroscopy

R. Gómez; S. Aburto; M. L. Marquina; M. Jiménez; V. Marquina; C. Quintanar; T. Akachi; R. Escudero; R. A. Barrio; D. Rios-Jara

doi:10.1103/PhysRevB.36.7226

Indication of high local fields in the YBa2Cu2.9375Fe0.0625Oδ superconductor by Mössbauer spectroscopy

R. Gómez, S. Aburto, M. L. Marquina, M. Jiménez, V. Marquina, C. Quintanar, T. Akachi, R. Escudero, R. A. Barrio, D. Rios-Jara

DOI 10.1103/PhysRevB.36.7226 · Physical Review B

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Abstract

Mössbauer spectra of a YBa2Cu2.9375Fe0.0625Oδ superconducting sample were obtained at different temperatures ranging from 50 to 120 K. The results clearly show that Fe substitutes for Cu in this complex. All the spectra showed a pair of superimposed quadrupole doublets with essentially the same splittings but different isomer shifts, corresponding to two different environments of the substituted atoms. The values of the isomer shifts obtained correspond to low-spin Fe atoms, which implies strong local fields, or strong bonding between the atoms.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu2.9375Fe0.0625Oδ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	75	Pressure not reported	onset
YBa2Cu2.9375Fe0.0625Oδ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55	Pressure not reported	zero_resistance
YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown