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Gap anisotropy, spin fluctuations, and normal-state properties of the electron-doped superconductor Sr0.9La0.1CuO2
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UNSPECIFIED. (2002) Gap anisotropy, spin fluctuations, and normal-state properties of the electron-doped superconductor Sr0.9La0.1CuO2. PHYSICAL REVIEW B, 65 (22). -. ISSN 1098-0121
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Official URL: http://dx.doi.org/10.1103/PhysRevB.65.224520
Abstract
We report the results from a thermopower and a Cu nuclear magnetic resonance (NMR) study of the infinite-CuO2-layer electron-doped high-temperature superconducting cuprate (HTSC) Sr0.9La0.1CuO2. We find that the temperature dependence of the thermopower, S(T), is different from that observed in the hole-doped HTSC. In particular, we find that dS(T)/dT is positive above similar to120 K. However, we show that S(T) can still be described by the same model developed for the hole-doped HTSC and hence S(T) is not anomalous and does not imply phonon-mediated pairing as has previously been suggested. The Cu NMR data reveal a Knight shift and spin lattice relaxation rate below T-c that are inconsistent with isotropic s-wave pairing. The Cu spin lattice relaxation rate in the normal state, however, is Curie-Weiss like and is comparable to that of the optimally and overdoped hole-doped HTSC La2-xSrxCuO4. The magnitude of the Knight shift indicates that the density of states at the Fermi level is anomalously small when compared with the hole-doped HTSC with the same T-c, indicating that the size of N(E-f) is of little importance in the HTSC. We find no evidence of the normal state pseudogap that is observed in the hole-doped HTSC and which was recently reported to exist in the electron-doped HTSC Nd1.85Ce0.15CuO4 from infrared reflectance measurements.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Journal or Publication Title: | PHYSICAL REVIEW B | ||||
| Publisher: | AMERICAN PHYSICAL SOC | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 1 June 2002 | ||||
| Dates: |
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| Volume: | 65 | ||||
| Number: | 22 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | - | ||||
| Identification Number: | 10.1103/PhysRevB.65.224520 | ||||
| Publication Status: | Published | ||||
| URI: | http://wrap.warwick.ac.uk/id/eprint/10740 |
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