Novel Dynamic Scaling Regime in Hole-DopedLa2CuO4

2003/07/24 by Wei Bao, Y. Chen, Yiming Qiu +2
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.91.127005

published as published as Physical Review Letters, vol. 91, 127005 (2003) · 4 pages, 4 figures

arxiv created 2003/07/24 · openalex publication_date 2003/09/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Only 3% hole doping by Li is sufficient to suppress the long-range three-dimensional (3D) antiferromagnetic order in La₂CuO₄. The spin dynamics of such a 2D spin liquid state at T\ensuremath≪J was investigated with measurements of the dynamic magnetic structure factor S(\ensuremathω,q), using cold neutron spectroscopy, for single crystalline La₂Cu_0.94Li_0.06O₄. S(\ensuremathω,q) peaks sharply at (\ensuremathπ,\ensuremathπ) and crosses over around 50 K from \ensuremathω/T scaling to a novel low temperature regime characterized by a constant-energy scale. The possible connection to a crossover from the quantum critical to the quantum disordered regime of the 2D antiferromagnetic spin liquid is discussed.

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