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PreprintCC BY 4.0arXiv

Nuclear spin-lattice relaxation rate near a two-dimensional antiferromagnetic quantum critical point

  • Yutaka Itoh
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Abstract

We study the effects of zero-point spin fluctuations on the nuclear spin-lattice relaxation rate 1/T1 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/T1 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/T1 takes its local maximum as a function of temperature in the nearly antiferromagnetic state. Experimental observation of the local maximum in the 63Cu nuclear spin-lattice relaxation rate 1/T1 of lightly-doped superconductors La2−xSrxCuO4 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 La2−xSrxCuO4.

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Cite

BibTeXRIS
BibTeX
@misc{itoh2026nuclear,
  title = {{Nuclear spin-lattice relaxation rate near a two-dimensional antiferromagnetic quantum critical point}},
  author = {Yutaka Itoh},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.30518},
  eprint = {2609.30518},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.30518},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Nuclear spin-lattice relaxation rate near a two-dimensional antiferromagnetic quantum critical point
AU  - Yutaka Itoh
PY  - 2026
DA  - 2026/09/24
PB  - arXiv
DO  - 10.48550/arxiv.2609.30518
UR  - https://arxiv.org/abs/2609.30518
AB  - 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 ^63Cu nuclear spin-lattice relaxation rate 1/T_1 of lightly-doped superconductors La_2−xSr_xCuO_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−xSr_xCuO_4.
ER  -