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Magnetic properties of YB2(Cu0.94Zn0.06)3Ox (x = 6.0 to 7.0) studied by Mössbauer spectroscopy on substituted 170Yb3+
- Source :
- Physica C: Superconductivity. 218:272-282
- Publication Year :
- 1993
- Publisher :
- Elsevier BV, 1993.
-
Abstract
- We have used 170Yb Mossbauer spectroscopy on Yb3+ diluted at the Y3+ sites to study YBa2(Cu0.94Zn0.06)3Ox. In the fully oxygenated sample, the presence of Zn2+ introduces a Korringa dependence of the Yb3+ paramagnetic relaxation rate, indicating an increase in the density of states at the Fermi level, which is visible both above and below Tc (32 K). A molecular field coming from the Cu (2) is observed on all the Yb3+ probes in non-superconducting samples with x = 6.0 and 6.5 showing that at these oxygen levels, all the Cu (2)'s are locally magnetically correlated. For x = 6.88 molecular fields suggesting there is phase separation between local magnetic and non-magnetic superconducting regions. For x = 7.0, none of the Cu(2)'s are magnetically correlated. The general features of the oxygen-level dependence of the local magnetic properties are similar in the zinc-substituted and in the zinc-free samples, but magnetic ordering persists to higher oxygen levels when Zn2+ is present.
- Subjects :
- Superconductivity
Materials science
Field (physics)
Mössbauer effect
Fermi level
Analytical chemistry
Energy Engineering and Power Technology
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Paramagnetism
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Nuclear magnetic resonance
Electrical resistivity and conductivity
Mössbauer spectroscopy
Density of states
symbols
Electrical and Electronic Engineering
Subjects
Details
- ISSN :
- 09214534
- Volume :
- 218
- Database :
- OpenAIRE
- Journal :
- Physica C: Superconductivity
- Accession number :
- edsair.doi...........812fe9d7454a3e32a2ff98efd76d8630