Ceramics-Silikáty 48, (4) 197 - 205 (2004) |
|
Characterization of transition metal-containing oxide systems by Mössbauer Spectroscopy
|
Homonnay Zoltán 1, Kuzmann Ernõ 2, Németh Zoltán 1,
Klencsár Zoltán 2,
Nagy Sándor I. 1,
Vértes Attila 1
|
1 Department of Nuclear Chemistry, Eötvös Loránd University, Budapest 1518 P.O.Box 32, Hungary
2 Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences,
Budapest 1518 P.O.Box 32, Hungary
|
Keywords: Mössbauer spectroscopy, High temperature superconductors, Colossal magnetoresistance,
Isomer shift, Metallicity
|
High-temperature (high-Tc) superconductors and colossal magnetoresistant (CMR) materials belong to the most promising
materials of the past 2-3 decades for technical applications. Most of them are oxides and the crucial element which determines
their useful physical properties is often a transition metal (Cu, Co, Fe, Mn). ⁵⁷Fe Mössbauer Spectroscopy can be used
to characterize the electronic and structural properties of transition metal-containing oxides by providing information on the
local electronic structure of the lattice site where the Mössbauer probe is accommodated. By reviewing several Mössbauer
studies, it is demonstrated how the layered (2D) electronic structure of high-Tc superconductors can be deduced from the
analysis of the Mössbauer isomer shift and quadrupole splitting. We also show how the Mössbauer isomer shift indicates
metallicity of the ferromagnetic phase in the CMR material LaxSr1-xCoO₃. |
 PDF (0.2 MB) |
|
