Cooperative Phenomenon of Ferromagnetism and Unconventional Superconductivity in UGe2: A 73Ge-NQR Study under Pressure
Atsushi Harada, Shinji Kawasaki, Hisashi Kotegawa, Yoshio Kitaoka, Yoshinori Haga, Etsuji Yamamoto, Yoshichika Onuki, Kouhei Itoh, Eugene Haller, Hisatomo Harima
Abstract
We report on a cooperative phenomenon of ferromagnetism and unconventional superconductivity (SC) in UGe2 through the measurements of 73Ge nuclear-quadrupole-resonance (NQR) under pressure (P). The NQR spectra evidenced phase separation into ferromagnetic and paramagnetic phases in the vicinity of Pc 1.5 GPa, pointing to a first-order transition. The measurements of nuclear-spin-lattice-relaxation-rate 1/T1 revealed that SC emerges under the background of ferromagnetism, but not of the paramagnetic phase.
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