Abstract
Spin gap effects, consisting of a declining uniform susceptibility and spin paramagnetic NMR shift at low temperaturesin the normal state and associatedT 1 behavior, are discussed and documented in several cuprate superconductors. Dynamic spin magnetism in these systems is further reviewed in the light of mean-field models, where we note that detailed results from the model by Millis, Monien, and Pines are not borne out in recent neutron data on YBa2Cu3O6.92.T 1 data on17O in La1.85Sr0.15CuO4 are presented, showing consistency with neutron dynamic susceptibility data forT≧80 K, but exhibiting a strong spin gap character below 80 K which is not present in the neutron data. Data for Zn-doped YBCO withT c≈60 K are also presented, showing strong RKKY broadening from localized moments in the planes, but no spin gap effect such as that found in theT c=60 K oxygen-deficient phase.
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Walstedt, R.E., Warren, W.W. Spin gaps and spin dynamics in superconducting cuprates. Appl. Magn. Reson. 3, 469–481 (1992). https://doi.org/10.1007/BF03166278
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DOI: https://doi.org/10.1007/BF03166278