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A spin-glass compound, La$_{1.98}$Sr$_{0.02}$CuO$_4$, showsquasi-three-dimensional magnetic ordering below $\sim$40 K. A remarkablefeature is that the magnetic correlation length along the orthorhombic$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 stripestructure. The spin-glass state can be expressed as a random freezing ofquasi-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 thethree-dimensional antiferromagnetic ordered phase in La$_2$CuO$_4$ and theincommensurate phase in La$_{1.95}$Sr$_{0.05}$CuO$_4$ in which the positions ofthe incommensurate peaks are rotated by 45$^\circ$ in reciprocal space about($\pi$,$\pi$) from those observed in the superconducting La$_2$CuO$_4$compounds.Comment: 7 pages, RevTex, 8 PS figures, submitted to Phys. Rev.

physical review. b, condensed matter

Freezing of anisotropic spin clusters in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.98</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.02</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><…

Freezing of anisotropic spin clusters inLa1.98Sr0.02CuO<…