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

2000/10/31 by J. Bobroff, Julien Bobroff, H. Alloul +6 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Cuprate #Doping #Impurity #Kondo effect #Materials science #Moment (physics) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.86.4116

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

arxiv created 2001/04/13 · openalex publication_date 2001/04/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Using ⁷Li NMR shift data, the anomalous local moment induced by spinless Li impurities persists below T_c in YBa₂Cu₃O_6+y. In the underdoped regime, the moments retain their Curie law below T_c. In contrast, near optimal doping, the large Kondo screening observed above T_c (T_K\phantom\rule0ex0ex=\phantom\rule0ex0ex135\phantom\rule0ex0exK) is strongly reduced below T_c as expected theoretically when the superconducting gap develops. The limited spatial extent of the induced moment (on first near neighbor Cu) is not drastically modified below T_c, which allows a comparison with STM determination of the local density of states. Our results constrain theoretical models of the impurity electronic properties.

Citations

• Imaging the effects of individual zinc impurity atoms on superconductivity in Bi2Sr2CaCu2O8+δ

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