Physics – Condensed Matter – Superconductivity
Scientific paper
2007-05-21
Phys. Rev. B 75, 140502 (2007).
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.75.140502
We report that a novel type of superconducting order parameter has been realized in the ferromagnetic states in UGe$_2$ via $^{73}$Ge nuclear-quadrupole-resonance (NQR) experiments performed under pressure ($P$). Measurements of the nuclear spin-lattice relaxation rate $(1/T_1)$ have revealed an unconventional nature of superconductivity such that the up-spin band is gapped with line nodes, but the down-spin band remains gapless at the Fermi level. This result is consistent with that of a ferromagnetic spin-pairing model in which Cooper pairs are formed among ferromagnetically polarized electrons. The present experiment has shed new light on a possible origin of ferromagnetic superconductivity, which is mediated by ferromagnetic spin-density fluctuations relevant to the first-order transition inside the ferromagnetic states.
Haga Yoshinori
Haller Elmar
Harada Atsushi
Harima Hisatomo
Itoh Kohei M.
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