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

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.

published version

References in corpus (2)

• Antiferromagnetic ordering in superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.5}$
• Observation of Magnetic Moments in the Superconducting State of YBa${}_2$Cu${}_3$O${}_{6.6}$

Cited by in corpus (8)

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• Theory of High-Tc Superconductivity: Transition Temperature
• Neutron scattering study on La1.9Ca1.1Cu2O6+delta and La1.85Sr0.15CaCu2O6+delta
• A Magnetic Model of the Tetragonal-Orthorhombic Transition in the Cuprates
• Gapless spin excitations in superconducting La${}_{2-x}$Ca${}_{1+x}$Cu${}_2$O${}_6$ with $T_c$ up to 55 K
• Growth and structural characterization of large superconducting crystals of La${}_{2-x}$Ca${}_{1+x}$Cu${}_2$O${}_6$