89Y NMR study of the effect of Zn substitution on the spin dynamics of YBa2Cu4O8

Williams, GVM; Tallon, JL; Meinhold, R; Janossy, A [Jánossy, András (Szilárdtestfizika), author] Budapest University of Technology

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    • Physical sciences
    Zn-substituted YBa2Cu4O8 high-temperature superconductors have been probed by 89Y nuclear magnetic resonance (NMR), susceptibility, and thermopower measurements. With 89Y NMR we have been able to study the gap in the spin density of states using the real part of the spin susceptibility determined from the Knight shift as Zn is progressively substituted onto the plane copper site. Zn substitution results in a rapid decrease in Tc with a negligible decrease in the spin-gap energy and an inhomogeneous filling in of the gap in spin density of states.
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    2024-02-22 09:21