Persistence of Li Induced Kondo Moments in the Superconducting State of Cuprates

Details Persistence of Li Induced Kondo Moments in the Superconducting State of Cuprates Persistence of Li Induced Kondo Moments in the Superconducting State of Cuprates

2000-10-17

arxiv.org/abs/cond-mat/0010234v2

Phys. Rev. Lett. 30 april 2001

Physics

Condensed Matter

Superconductivity

accepted for publication in Phys. Rev. Lett. (issue of 30 april 2001) Revised version : 8 pages including 4 pages of text and

Scientific paper

10.1103/PhysRevLett.86.4116

We measure the magnetic susceptibility nearby Li spinless impurities in the superconducting phase of the high Tc cuprate YBaCuO. The induced moment which was found to exist above Tc persists below Tc. In the underdoped regime, it retains its Curie law below Tc. In contrast, near optimal doping, the large Kondo screening observed above Tc (T_K=135 K) is strongly reduced below Tc as expected theoretically when the superconducting gap develops. This moment still extends essentially on its 4 near neighbour Cu, showing the persistence of AF correlations in the superconducting state. A direct comparison with recent STM results of Pan et al. is proposed.

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