Spin Texture and Spin Dynamics in Superconducting Cuprates Near the Phase Transition Revealed by the Electron Paramagnetic Resonance
| Autor: | Boris I Kochelaev |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Superconductivity
Phase transition Materials science Condensed matter physics Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas law.invention law Condensed Matter::Superconductivity 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons General Materials Science Cuprate Texture (crystalline) 010306 general physics Anisotropy Spin (physics) Electron paramagnetic resonance |
| Zdroj: | Journal of Low Temperature Physics. 185:417-430 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/s10909-016-1602-0 |
| Popis: | A short review of experimental results and theoretical models of the spin texture and spin dynamics in superconducting cuprates near the phase transition developed on the basis of the EPR measurements is given. Distortions of the long-range antiferromagnetic order in the YBa $$_2$$ Cu $$_3$$ O $$_{6+y}$$ were investigated for $$y=0.1-0.4$$ using Yb $$^{3+}$$ ions as the EPR probe. In weakly doped samples with $$y=0.1$$ , a strong anisotropy of the EPR linewidth is revealed which was related to the indirect spin–spin interaction between the ytterbium ions via antiferromagnetic spin-waves. In the case of the doping level $$y=0.2-0.3$$ , the EPR signal consists of narrow and broad lines, which were attributed to formation of charged domain walls. A theoretical analysis is well consistent with experimental results for the case of coplanar elliptical domain walls. A discussion of possible reasons for the observed unusual planar oxygen isotope effect on a critical temperature T $$_\mathrm {c}$$ related to charge heterogeneity in underdoped cuprates is given. |
| Databáze: | OpenAIRE |
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