1999/10/31 by S. Wakimoto, Shuichi Wakimoto, S. Ueki +3 · 2 citations
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.supr-con
paper · pdf · doi:10.1103/physrevb.62.3547
7 pages, 6 figures
arxiv created 2000/05/10 · openalex publication_date 2000/08/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Systematic measurements of the magnetic susceptibility were performed on single crystals of lightly doped La_2\ensuremath-xSrxCuO4 (x=0.03, 0.04, and 0.05). For all samples the temperature dependence of the in-plane magnetic susceptibility shows typical spin-glass features with spin-glass transition temperatures Tg of 6.3, 5.5, and 5.0 K for x=0.03, 0.04, and 0.05, respectively. The canonical spin-glass order parameter extracted from the in-plane susceptibility of all the samples follows a universal scaling curve. On the other hand, the out-of-plane magnetic susceptibility deviates from Curie law below a temperature Tdv, higher than Tg. Comparing with previous neutron-scattering results with an instrumental energy resolution of \ensuremathΔ\ensuremathω\ensuremath∼0.25 meV from Wakimoto et al., the x dependence of Tdv is qualitatively the same as that of Tel (\ensuremathΔ\ensuremathω=0.25 meV), the temperature below which the elastic magnetic scattering develops around (\ensuremathπ,\ensuremathπ). Thus a revised magnetic phase diagram in the lightly doped region of La_2\ensuremath-xSrxCuO4 is proposed. The Curie constants calculated from the in-plane susceptibility are independent of the Sr concentration. On the basis of the cluster spin-glass model, this fact might reflect an inhomogeneous distribution of doped holes in the CuO2 plane, such as in a stripe structure.