二维反铁磁量子临界点附近的核自旋-晶格弛豫率
Nuclear spin-lattice relaxation rate near a two-dimensional antiferromagnetic quantum critical point
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中文总结 AI 辅助
本文在自洽重整化理论中研究二维反铁磁量子临界点附近零自旋涨落对核自旋-晶格弛豫率的影响，发现强耦合时1/T1出现局部最大值，并与欠掺杂La2-xSrxCuO4的实验观测相关联。
中文摘要 AI 辅助
我们在自洽重整化理论中研究了零自旋涨落对二维反铁磁量子临界点附近核自旋-晶格弛豫率1/$T_1$的影响。对于弱的模-模耦合常数$y_1 < $ 0.1，1/$T_1$在量子临界点附近的有限温度行为类似于仅考虑热自旋涨落的情况。对于强的模-模耦合常数$y_1 > $ 0.1，在近反铁磁态中，1/$T_1$作为温度的函数取其局部最大值。在轻度掺杂超导体La$_{2-x}$Sr$_x$CuO$_4$（$x$ = 0.06-0.10）中实验观测到的$^{63}$Cu核自旋-晶格弛豫率1/$T_1$的局部最大值与零自旋涨落效应相关。在欠掺杂超导体La$_{2-x}$Sr$_x$CuO$_4$的电子自旋动力学中，讨论了二维磁量子临界点和零自旋涨落的作用。
英文摘要
We study the effects of zero-point spin fluctuations on the nuclear spin-lattice relaxation rate 1/$T_1$ around a two-dimensional antiferromagnetic quantum critical point in the self-consistent renormalization theory. For a weak mode-mode coupling constant $y_1 < $ 0.1, the finite temperature behavior of 1/$T_1$ across the quantum critical point resembles that for only the thermal spin fluctuations. For a strong mode-mode coupling constant $y_1 > $ 0.1, 1/$T_1$ takes its local maximum as a function of temperature in the nearly antiferromagnetic state. Experimental observation of the local maximum in the $^{63}$Cu nuclear spin-lattice relaxation rate 1/$T_1$ of lightly-doped superconductors La$_{2-x}$Sr$_x$CuO$_4$ with $x$ = 0.06-0.10 is associated with the effects of the zero-point spin fluctuations. The two-dimensional magnetic quantum critical point and the role of the zero-point spin fluctuations are discussed in the electron spin dynamics of underdoped superconductors La$_{2-x}$Sr$_x$CuO$_4$.
发表机构
- Kyoto Sangyo University（京都产业大学）
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