A new monoclinic phase of superconducting Tl₂Ba₂CuO_6+δ

Abstract

High-resolution time-of-flight neutron and synchrotron X-ray powder diffraction studies of the ‘orthorhombic’ form of the high-T_c superconductor Tl₂Ba₂CuO_6+δ evidence both the orthorhombic (Fmmm) phase and a new monoclinic (F112/m) form at high excess oxygen contents δ.

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