Mössbauer spectroscopy of CuO and its relevance to high-temperature superconductors

1990 ◽  
Vol 42 (4) ◽  
pp. 2188-2192 ◽  
Author(s):  
M. G. Smith ◽  
R. D. Taylor ◽  
M. P. Pasternak ◽  
H. Oesterreicher
Keyword(s):  
Mössbauer Spectroscopy ◽  
High Temperature ◽  
Mossbauer Spectroscopy ◽  
High Temperature Superconductors ◽  
Mößbauer Spectroscopy

scholarly journals High-Temperature Superconductors and Related Compounds Studied by Mössbauer Spectroscopy

1993 ◽  
Vol 15 (3-4) ◽  
pp. 211-224 ◽  
Author(s):  
E. Kuzmann ◽  
Z. Homonnay ◽  
S. Nagy ◽  
M. Gál ◽  
A. Vértes
Keyword(s):  
Phase Transformation ◽  
Mössbauer Spectroscopy ◽  
High Temperature ◽  
Low Temperature ◽  
Mossbauer Spectroscopy ◽  
High Temperature Superconductors ◽  
Temperature Phase ◽  
Mößbauer Spectroscopy ◽  
Related Compounds ◽  
Low Temperature Phase

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.

POSSIBLE RESONATING VALENCE BOND TRAPPING BY IMPURITIES IN HIGH TEMPERATURE SUPERCONDUCTORS, OBSERVED BY MÖSSBAUER SPECTROSCOPY

1987 ◽  
Vol 01 (03n04) ◽  
pp. 1109-1116 ◽  
Author(s):  
J. Tihov ◽  
P. Vasilev ◽  
I. Kostadinov ◽  
M. Mateev ◽  
V. Rusanov ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
Mossbauer Spectroscopy ◽  
High Temperature Superconductors ◽  
Valence Bond ◽  
Mossbauer Spectra ◽  
Mößbauer Spectroscopy ◽  
Resonating Valence Bond ◽  
Bond Trapping

Ytrium-based high temperature superconductor (HTS) YBa2Cu3O7−y was studied electrically, by Mössbauer spectroscopy and also structurally. The anomaly in the 90 K region of the Mössbauer spectra and resistivity suggests strongly trapping of the resonating valence bond (RVB) of oxigen vacancies on the base of the orthorombic cell.

In situ— High Temperature Mössbauer Spectroscopy of Iron Nitrides and Nitridoferrates

2003 ◽  
Vol 629 (10) ◽  
pp. 1787-1794 ◽  
Author(s):  
V. Ksenofontov ◽  
S. Reiman ◽  
M. Waldeck ◽  
R. Niewa ◽  
R. Kniep ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
High Temperature ◽  
Mossbauer Spectroscopy ◽  
Iron Nitrides ◽  
Mößbauer Spectroscopy

High temperature Mössbauer spectroscopy of titanomagnetite and maghemite in basalts

1994 ◽  
Vol 91 (1) ◽  
pp. 595-599 ◽  
Author(s):  
ö. Helgason ◽  
H. P. Gunnlaugsson ◽  
K. Jónsson ◽  
S. Steinthórsson
Keyword(s):  
Mössbauer Spectroscopy ◽  
High Temperature ◽  
Mossbauer Spectroscopy ◽  
Mößbauer Spectroscopy
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