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Site selection NMR study on electronic state in and near vortex core of YBa2Cu4O8 |
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| Authors: | Kosuke KakuyanagiKen-ichi Kumagai Yuji Matsuda |
| Affiliation: | a Division of Physics, Graduate School of Science, Hokkaido University, Kita-ku, Sapporo 060-0810, Japan b Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8581, Japan |
| Abstract: | We report a site-selective 17O spin-lattice relaxation rate T1−1 in the vortex state of YBa2Cu4O8. We found that T1−1 at the planar sites exhibits an unusual nonmonotonic NMR frequency dependence. Based on T1−1 in the vortex core region, we establish strong evidence that the local density of states within the vortex core is strongly reduced. |
| Keywords: | A. Superconductors D. Magnetic properties D. Nuclear magnetic resonance D. Electronic structure |
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