Structural and magnetic instabilities of La2-xSrxCaCu2O6
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.
Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany. Univ Tokyo, Sch Frontier Sci, Dept Adv Mat Sci, Bunkyo Ku, Tokyo 1138656, Japan. Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany. Univ Konstanz, Dept Phys, D-78434 Constance, Germany. Ctr Etud Saclay, CNRS, CEA, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France. Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France. CEA, MDN, SPSMS, DRFMC, F-38054 Grenoble, France. Ulrich, C, Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany.
Record created on 2007-01-24, modified on 2016-08-08