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：8

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.

引用

页数：6

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