Jul, 2003
Unconventional superconductivity in ferromagnetic UGe2: a Ge-73 nuclear magnetic resonance/nuclear quadrupole resonance study
JOURNAL OF PHYSICS-CONDENSED MATTER
- Volume
- 15
- Number
- 28
- First page
- S2043
- Last page
- S2046
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1088/0953-8984/15/28/323
- Publisher
- IOP PUBLISHING LTD
We report Ge-73 nuclear 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 rate 1/T-1 of the Ge-73 NMR at P = 0 have revealed a T1T = constant behaviour well below T-Curie = 52 K, evidencing the presence of a non-zero density of states at the Fermi level for the up-and down-spin bands in the ferromagnetic state. At P = 1.3 GPa, where the ferromagnetic transition is reduced to T-Curie = 26 K, the dependence on temperature (T) of NQR 1/T-1 at zero field has demonstrated the onset of the superconducting transition at T, = 0.55 K. The lack of a coherence peak in (1/T-1) just below T,, followed by a T-3-like behaviour, provide compelling evidence for the unconventional nature of the superconducting state that coexists with the ferromagnetic state on a microscopic scale in UGe2.
- Link information
- ID information
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- DOI : 10.1088/0953-8984/15/28/323
- ISSN : 0953-8984
- eISSN : 1361-648X
- Web of Science ID : WOS:000184563300025