Freezing of anisotropic spin clusters in La1.98Sr0.02CuO4

Abstract

A spin-glass compound, La${}_{1.98}$Sr${}_{0.02}$CuO${}_4$, shows quasi-three-dimensional magnetic ordering below $\sim$40 K. A remarkable feature is that the magnetic correlation length along the orthorhombic $a{}_{\mathrm{ortho}}$ axis is much longer than that along the $b{}_{\mathrm{ortho}}$ axis, suggesting that the spin structure is closely related to the diagonal stripe structure. The spin-glass state can be expressed as a random freezing of quasi-three-dimensional spin clusters with anisotropic spin correlations (${\xi }_a^{\prime }\sim 160$ Å, ${\xi }_b^{\prime }\sim 25$ Å, and ${\xi }_c^{\prime }\sim 4.7$ Åat 1.6 K). The new magnetic state is important as an intermediate phase between the three-dimensional antiferromagnetic ordered phase in La${}_2$CuO${}_4$ and the incommensurate phase in La${}_{1.95}$Sr${}_{0.05}$CuO${}_4$ in which the positions of the incommensurate peaks are rotated by 45${}^{\circ }$ in reciprocal space about ($\pi$,$\pi$) from those observed in the superconducting La${}_2$CuO${}_4$ compounds.

arXiv comment7 pages, RevTex, 8 PS figures, submitted to Phys. Rev. B

References in corpus (3)

• Neutron Scattering Study of Spin Density Wave Order in the Superconducting State of Excess-Oxygen-Doped La2CuO4+y
• Observation of New Incommensurate Magnetic Correlations at the Lower Critical Concentration for Superconductivity (x=0.05) in La(2-x)Sr(x)CuO4
• Instantaneous Spin Correlations in La2CuO4

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