Abstract
The copper isotope effect on the relaxation rate of crystal-field transitions in the slightly underdoped high-temperature superconductor HoBa 2Cu 4O 8 has been investigated by means of inelastic neutron scattering. The measurements give clear evidence for the opening of a normal state pseudogap at T∗ far above T c, but it is shifted from T∗=160(10) K for the HoBa 2 63Cu 4O 8 compound to T∗=185(5) K for the HoBa 2 65Cu 4O 8 compound, giving rise to an isotope effect of Δ T∗=25(15) K.
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