High-Tc superconductors studied by57Co,57Fe,119Sn, and151Eu m�ssbauer spectroscopy

Кузманн, Э.; Nagy, S.; Homonnay, Z.; Vértes, A.; Halász, I.; Gál, M.; Csákvári, B.; Torkos, K.; Bánkuti, J.; Kirschner, I.; Wei, Yen; Nath, Amar

doi:10.1007/bf00672222

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“…Isomer shift values are given relative to alpha-iron, EuF3, and CaSnO3. Providing the gamma rays 3.109Bq 57C0, 10 Bq 15tEuF3 and 3.10 Bq CallgSnO3 sources were used. The evaluation of the spectra was performed by conventional least-square fitting of lines using MOSFUN and SIRIUS programs.…”

Section: Methodsmentioning

confidence: 99%

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High‐Temperature Superconductors and Related Compounds Studied byMössbauer Spectroscopy

Кузманн

Homonnay

Nagy

et al. 1993

Active and Passive Electronic Components

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57Fe,119Sn, and151Eu Mössbauer spectroscopy was used to study the chemical structure, phonon mode changes, and low-temperature phase transformation around the Tcas well as suppression of superconductivity in high-temperature superconductors and related compounds. Anomalous temperature-dependent changes in the total57Fe spectral area fraction and in the Mössbauer line shift were simultaneously found around the Tcin a EuBa2(Cu0.9957Fe0.01)3O7-dsuperconductor. These anomalous changes were attributed to phonon softening and low-temperature phase transformation occurring around the superconducting transition. Significant differences were observed between the57Fe Mössbauer spectra of superconducting EuBa2(Cu0.9957Fe0.01)3O7-dand the isostructural non-superconducting PrBa2(Cu0.9957Fe0.01)3O7-d. The differences were interpreted in connection with the suppression of superconductivity (by hole filling or hybridization of Pr, Cu and O states) in the Pr-containing compound. The unusually high isomer shift value observed in the Pr-containing material can give evidence for the charge transfer mechanism between the Cu(1) chains and the Cu(2) planes and for its role in the suppression of superconductivity.

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Section: Methodsmentioning

confidence: 99%

“…1 shows the structure of 1-2-3 type (e.g., EuBa2Cu307_d) and 1-2-4 type (e.g., EuBazCu4Os) superconductors. By introducing 15Eu, 19Sn, or 57Fe into the lattice of these orthorhombic perovskites, the location and distribution of these probing nuclides can be determined by M6ssbauer spectroscopy [10,11,30].…”

Section: Methodsmentioning

confidence: 99%