Observation of Magnetic Moments in the Superconducting State of YBa${}_2$Cu${}_3$O${}_{6.6}$

Abstract

Neutron Scattering measurements for YBa${}_2$Cu${}_3$O${}_{6.6}$ have identified small magnetic moments that increase in strength as the temperature is reduced below $T^{\ast }$ and further increase below $T_c$. An analysis of the data shows the moments are antiferromagnetic between the Cu-O planes with a correlation length of longer than 195 Åin the $a$-$b$ plane and about 35 Åalong the c-axis. The origin of the moments is unknown, and their properties are discusssed both in terms of Cu spin magnetism and orbital bond currents.

9 pages, and 4 figures

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