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A neutron scattering study of nonsuperconductingLa$_{2-x}$Sr$_x$CaCu$_2$O$_6$ (x=0 and 0.2), a bilayer copper oxide without CuOchains, has revealed an unexpected tetragonal-to-orthorhombic transition with adoping dependent transition temperature. The predominant structuralmodification below the transition is an in-plane shift of the apical oxygen. Inthe doped sample, the orthorhombic superstructure is strongly disordered, and aglassy state involving both magnetic and structural degrees of freedom developsat low temperature. The spin correlations are commensurate.Comment: published versio

physical review. b, condensed matter

Structural and magnetic instabilities of<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>2</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</…

Structural and magnetic instabilities ofLa2−xSrxCaCu