Spin Texture and Spin Dynamics in Superconducting Cuprates Near the Phase Transition Revealed by the Electron Paramagnetic Resonance

详细信息    查看全文

• 作者：B. I. Kochelaev
• 关键词：Superconductivity ; Antiferromagnetism ; Cuprates ; Phase separation ; EPR
• 刊名：Journal of Low Temperature Physics
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：185
• 期：5-6
• 页码：417-430
• 全文大小：666 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Characterization and Evaluation Materials
  Magnetism and Magnetic Materials
  
• 出版者：Springer Netherlands
• ISSN：1573-7357
• 卷排序：185

文摘

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.