The magnetic state of Cu in the CuO2-bilayers of PrBa2Cu3O6+x: An NMR-investigation

Autor: K. Nehrke, M. W. Pieper, T. Wolf, F. Wiekhorst
Rok vydání: 1996
Předmět:
Zdroj: Journal of Low Temperature Physics. 105:431-436
ISSN: 1573-7357
0022-2291
DOI: 10.1007/bf00768424
Popis: The antiferromagnetic state in the CuO2-bilayers of PrBa2 Cu3O6+x is usually assumed to be similar to the one in YBa2Cu3O6. One evidence for this is the similarity of the NMR-spectra of the Cu(2)-sites (planes) in both materials. We reinvestigated the NMR-spectra in PrBa2Cu3O6+x-crystals and observed below 2 K two additional, broad peaks centered roughly at 110 and 250 MHz. The signal is only present after applying a field larger than 5 T below 2.0 K. The frequency and temperature dependence of the relaxation rates allows us to ascribe the signal to the Cu(2)-sites. The signal vanishes irreversibly above 2.0 K and reversibly in fields above 0.5 T. Its intensity versus field shows at all frequencies a narrow peak near −0.2 T, for the field antiparallel to the one inducing the state, which shows the presence of a net polarisation of the spin system.
Databáze: OpenAIRE
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