JOL, JC and REEFMAN, D and BROM, HB and ZETTERER, T and HAHN, D and OTTO, HH and RENK, KF (1991) SINGLE-CRYSTAL TL-205 NMR IN THE NORMAL AND SUPERCONDUCTING STATE OF THE HIGH-TC SUPERCONDUCTOR TL2BA2CACU2O8 - A STUDY OF THE KNIGHT AND CHEMICAL-SHIFT. PHYSICA C, 175 (1-2). pp. 12-16. ISSN 0921-4534,
Full text not available from this repository.Abstract
We have performed Tl-205 NMR in c-axis aligned single crystals of Tl2Ba2CaCu2O8 (T(c) almost-equal-to 101 K) in a field of 4.7 T. There are two Tl-lines with, at room temperature, distinct intensities, chemical and Knight shifts. One line arises from the normal (N) Tl-sites in the Tl-double layers and mimics the Cu-nuclear spin. The other one arises from impurity (I) Tl's replacing part of the Ca-sites within the Cu double layer, i.e. the same locations as for the Y-ions in YBa2Cu3O7. Because it appeared possible to follow the dependence of the shifts of the two lines on temperature (T) down to T/T(c) less-than-or-equal-to 0.1, (for H parallel-to c and H parallel-to a, b) the chemical and the Knight shifts could be determined accurately. The T-dependences of the Knight shift of the N (I)-line in the present sample with about 10% Ca-replacement are analogous to those of Cu(Y) in YBa2Cu3O6.6: the shift starts to decrease already above T(c) without an abrupt change at T(c). Only below T/T(c) almost-equal-to 0.6 do the resonance lines start to broaden.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/55047 |
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