Low-energy spin dynamics and critical hole concentrations in La2-xSrxCuO4 (0.07 ≤ x ≤ 0.2) revealed by 139La and 63Cu nuclear magnetic resonance

被引：7
|
作者：
Baek, S. -H. [1 ]
Erb, A. [2 ]
Buechner, B. [1 ,3 ]
机构：
[1] IIFW Dresden, Inst Solid State Res, Helmholtz Str 20, D-01069 Dresden, Germany
[2] Bayer Akad Wissensch, Walther Meissner Inst, Walther Meissner Str 8, D-85748 Garching, Germany
[3] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany
来源：
PHYSICAL REVIEW B | 2017年 / 96卷 / 09期
关键词：
TC SUPERCONDUCTOR LA2-XSRXCUO4; TRANSITION-TEMPERATURE; PHASE-BOUNDARY; NQR RELAXATION; SR; LA2-XSR(X)CUO4; DISAPPEARANCE; DIAGRAM; SYSTEM; FIELD;
D O I：
10.1103/PhysRevB.96.094519
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report a comprehensive La-139 and Cu-63 nuclear magnetic resonance study on La2-xSrxCuO4 (0.07 <= x <= 0.2) single crystals. The La-139 spin-lattice relaxation rate T-139(1)-1 is drastically influenced by Sr doping x at low temperatures. A detailed field dependence of T-139(1)-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 T-63(1)-1 is well described by a Curie-Weiss law at high temperatures, yielding the Curie-Weiss temperature Theta as a function of doping. Theta changes sharply through a critical hole concentration x(c) similar to 0.09. x(c) appears to correspond to the delocalization limit of doped holes, above which the bulk nature of superconductivity is established.
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页数：6
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