K. Kakurai et al., NEUTRON-SCATTERING STUDY OF MAGNETIC FLUCTUATIONS IN ZN-SUBSTITUTED YBA2CU3O6.6, Physical review. B, Condensed matter, 48(5), 1993, pp. 3485-3490
Inelastic-neutron-scattering measurements of magnetic fluctuations in
YBa2Cu2.9Zn0.1O6.6 as a function of temperature are presented. In this
nonsuperconducting sample magnetic fluctuations at (pi, pi) are obser
ved at all temperatures (10 < T < 200 K) and energies (2 < E < 12 meV)
studied in the experiment. This finding should be contrasted to the s
ituation in pure, superconducting YBa2Cu3O6.6, where the low-energy (E
< 5 meV) spin fluctuations are suppressed at low temperature leading
to gaplike behavior.