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Carrier concentration independent antiferromagnetic spin fluctuations in the electron-doped high-temperature superconducting cuprate Pr2-xCexCuO4
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UNSPECIFIED (2004) Carrier concentration independent antiferromagnetic spin fluctuations in the electron-doped high-temperature superconducting cuprate Pr2-xCexCuO4. PHYSICAL REVIEW B, 69 (13). -. doi:10.1103/PhysRevB.69.134504 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.69.134504
Abstract
We have performed Cu-63 NMR measurements on the electron-doped high-temperature superconducting cuprate (HTSC) Pr2-xCexCuO4 (x=0.10, 0.15, and 0.20), at 9 T, which is sufficient to suppress T-c to zero. The Cu spin-lattice relaxation rate and the Cu spin-lattice relaxation rate anisotropy can be consistently interpreted in terms of coupling to antiferromagnetic spin fluctuations for temperatures as low as 6 K. We find that the spin-fluctuation spectrum probed by the Cu spin-lattice relaxation rate does not change with increasing electronic concentration, contrary to a recent theoretical predication. There is no evidence in the Cu spin-lattice relaxation rate data for a temperature-independent spin gap that is as large as theoretically predicted or as large as the normal-state pseudogap energy reported from infrared reflectance measurements on the electron-doped HTSC Nd2-xCexCuO4. The Cu nuclear quadrupole resonance frequency is significantly smaller than that observed in the hole doped HTSC, which implies a nearly complete cancellation of the Cu 3d, O 2p, and nuclei contributions to the electric-field gradient at the Cu nucleus. The orbital shift anisotropy is similar to that observed in the hole doped HTSC, implying a similar relative splitting of the Cu 3d orbitals.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW B | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 1098-0121 | ||||
Official Date: | April 2004 | ||||
Dates: |
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Volume: | 69 | ||||
Number: | 13 | ||||
Number of Pages: | 8 | ||||
Page Range: | - | ||||
DOI: | 10.1103/PhysRevB.69.134504 | ||||
Publication Status: | Published |
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