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

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

1999-07-28

arxiv.org/abs/cond-mat/9907435v2

Phys. Rev. B 61, 4326 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.61.4326

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 $a\rm_{ortho}$ axis is much longer than that along the $b\rm_{ortho}$ 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 ($\xi'_a\sim160$ \AA, $\xi'_b\sim25$ \AA, and $\xi'_c\sim4.7$ \AA at 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.

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