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23 April 2024

» pubmed » pmid14995397

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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 ;
Date:	30 Jan 2004
Journal:	Phys Rev Lett, 92 (4), 047003
Abstract:	63Cu nuclear magnetic resonance spin-echo decay rate (T-12) measurements are reported for the normal and superconducting states of a single crystal of Pr(1.85)Ce(0.15)CuO(4-y) in a magnetic field B(0)=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 approximately 25 K. This dependence indicates that T-12 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:	PubMed, pmid14995397
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