Structural and Magnetic Instabilities of La$_{2-x}$Sr$_x$CaCu$_2$O$_6$

C. Ulrich; S. Kondo; M. Reehuis; H. He; C. Bernhard; C. Niedermayer; F. Bouree; P. Bourges; M. Ohl; H. M. Ronnow; H. Takagi; B. Keimer

doi:10.1103/PhysRevB.65.220507

Structural and Magnetic Instabilities of La$_{2-x}$Sr$_x$CaCu$_2$O$_6$

Superconductivity 2009-11-07 v2 Strongly Correlated Electrons

Authors: C. Ulrich , S. Kondo , M. Reehuis , H. He , C. Bernhard , C. Niedermayer , F. Bouree , P. Bourges , M. Ohl , H. M. Ronnow , H. Takagi , B. Keimer

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Abstract

A neutron scattering study of nonsuperconducting La $_{2-x}$ Sr $_x$ CaCu $_2$ O $_6$ (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.

Keywords

structural instability magnetic instability La$_{2-x}$Sr$_x$CaCu$_2$O$_6$ neutron scattering tetragonal-to-orthorhombic transition

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@article{arxiv.cond-mat/0201253,
  title  = {Structural and Magnetic Instabilities of La$_{2-x}$Sr$_x$CaCu$_2$O$_6$},
  author = {C. Ulrich and S. Kondo and M. Reehuis and H. He and C. Bernhard and C. Niedermayer and F. Bouree and P. Bourges and M. Ohl and H. M. Ronnow and H. Takagi and B. Keimer},
  journal= {arXiv preprint arXiv:cond-mat/0201253},
  year   = {2009}
}

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Structural and Magnetic Instabilities of La$_{2-x}$Sr$_x$CaCu$_2$O$_6$

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