Abstract
We report 73Genuclear magnetic resonance/nuclear quadrupole resonance (NMR/NQR)measurements on the itinerant ferromagnetic superconductor UGe2 at ambient pressure(P = 0) and P = 1.3 GPa.Measurements of the nuclear spin–lattice relaxation rate1/T1 of the 73Ge NMR atP = 0 have revealed aT1T = constantbehaviour well below TCurie = 52 K,evidencing the presence of a non-zero density of states at the Fermi level for theup- and down-spin bands in the ferromagnetic state. At P = 1.3 GPa,where the ferromagnetic transition is reduced to TCurie = 26 K, the dependenceon temperature (T)of NQR 1/T1 at zerofield has demonstrated the onset of the superconducting transition at Tc = 0.55 K. The lack of acoherence peak in (1/T1)just below Tc,followed by a T3-likebehaviour, provide compelling evidence for the unconventional nature of the superconductingstate that coexists with the ferromagnetic state on a microscopic scale in UGe2.
Published Version
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