Neutron scattering measurements for YBa2Cu3O6.6 have identified small magnetic moments that increase in strength as the temperature is reduced below T* and further increase below Tc. An analysis of the data shows the moments are antiferromagnetic between the Cu-O planes with a correlation length of longer than 195 Å in the a-b plane and about 35 Å along 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.
H. A. Mook et al., "Observation of Magnetic Moments in the Superconducting State of YBa2Cu3O6.6," Physical Review B - Condensed Matter and Materials Physics, vol. 64, no. 1, pp. 012502-1-012502-4, American Physical Society (APS), May 2001.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevB.64.012502
Materials Science and Engineering
Keywords and Phrases
barium derivative; copper derivative; yttrium; chemical bond; conductance; conductor; magnetism; neutron scattering; temperature dependence
International Standard Serial Number (ISSN)
Article - Journal
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