Structural and magnetic instabilities of La2-xSrxCaCu2O6
- Ulrich, C.
- Kondo, S.
- Reehuis, M.
- He, H.
- Bernhard, C.
- Niedermayer, C.
- Bouree, F.
- Bourges, P.
- Ohl, M.
- Ronnow, H. M.
- Takagi, H.
- Keimer, B.
DOIAbstract
A neutron-scattering study of nonsuperconducting La2-xSrxCaCu2O6 (x=0 and 0.2), a bilayer copper oxide without CuO chains, has revealed an unexpected tetragonal-to-orthorhombic transition with a doping dependent transition temperature. The predominant structural modification below the transition is an in-plane shift of the apical oxygen. In the doped sample, the orthorhombic superstructure is strongly disordered, and a glassy state involving both magnetic and structural degrees of freedom develops at low temperature. The spin correlations are commensurate
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