2017/09/18 by S.-H. Baek, S. -H. Baek, A. Erb +1 · 9 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Delocalized electron #Doping #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Relaxation (psychology) #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.094519
published in Physical review. B./Physical review. B 96(9) (American Physical Society) · 7 pages, 4 figure, published in PRB
arxiv created 2017/09/18 · openalex publication_date 2017/09/18 · arxiv updated 2017/09/20 · openalex created_date 2017/09/25 · openalex updated_date 2026/08/05
We report a comprehensive 139La and 63Cu nuclear magnetic resonance study on La_2\ensuremath-xSrxCuO4 (0.07\ensuremath≤x\ensuremath≤0.2) single crystals. The 139La spin-lattice relaxation rate 139T1^\ensuremath-1 is drastically influenced by Sr doping x at low temperatures. A detailed field dependence of 139T1^\ensuremath-1 at x=1/8 suggests that charge ordering induces the critical slowing down of spin fluctuations toward glassy spin order and competes with superconductivity. On the other hand, the 63Cu relaxation rate 63T1^\ensuremath-1 is well described by a Curie-Weiss law at high temperatures, yielding the Curie-Weiss temperature \mathrm\ensuremathΘ as a function of doping. \mathrm\ensuremathΘ changes sharply through a critical hole concentration xc\ensuremath∼0.09. xc appears to correspond to the delocalization limit of doped holes, above which the bulk nature of superconductivity is established.