Inhomogeneous Electronic Structure Probed by Spin-Echo Experiments in the Electron Doped High-Tc Superconductor Pr1.85Ce0.15CuO4−y
F. Zamborszky, G. Wu, J. Shinagawa, W. Yu, H. Balci, R. L. Greene, W. G. Clark, S. E. Brown
DOI 10.1103/PhysRevLett.92.047003 · Physical Review Letters
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Abstract
Cu63 nuclear magnetic resonance spin-echo decay rate (T2−1) measurements are reported for the normal and superconducting states of a single crystal of Pr1.85Ce0.15CuO4−y in a magnetic field B0=9 T over the temperature range 2<T<200 K. The spin-echo decay rate is temperature dependent for T<55 K and has a substantial dependence on the radio frequency (rf) pulse parameters below T≈25 K. This dependence indicates that T2−1 is strongly effected by a local magnetic field distribution that can be modified by the rf pulses, including ones that are not at the nuclear Larmor frequency. The low-temperature results are consistent with the formation of a static inhomogeneous electronic structure that couples to the rf fields of the pulses.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | onset |
| Pr1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
| Pr2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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