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Journal Articles

Anisotropic magnetic fluctuations in ferromagnetic superconductor UGe$$_2$$; $$^{73}$$Ge-NQR study at ambient pressure

Noma, Yuichiro*; Kotegawa, Hisashi*; Kubo, Tetsuro*; To, Hideki*; Harima, Hisatomo*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*; Ito, Kohei*; Haller, E. E.*; et al.

Journal of the Physical Society of Japan, 87(3), p.033704_1 - 033704_5, 2018/03

 Times Cited Count:4 Percentile:36.2(Physics, Multidisciplinary)

Journal Articles

Experimental evidence for ferromagnetic spin-pairing superconductivity emerging in UGe$$_2$$; A $$^{73}$$Ge-nuclear-quadrupole-resonance study under pressure

Harada, Atsushi*; Kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Physical Review B, 75(14), p.140502_1 - 140502_4, 2007/04

 Times Cited Count:28 Percentile:72.28(Materials Science, Multidisciplinary)

This paper reports that a different type of superconducting order parameter has been realized in the ferromagnetic states in UGe$$_2$$ via $$^{73}$$Ge-nuclear-quadrupole-resonance experiments performed under pressure. Measurements of the nuclear spin-lattice relaxation rate (1/$$T$$$rm$_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 light on the possible origin of ferromagnetic superconductivity, which is mediated by ferromagnetic spin-density fluctuations relevant to the first-order transition inside the ferromagnetic states.

Journal Articles

Unconventional supercondnuctivity in the itinerant ferromagnet UGe$$_2$$; $$^{73}$$Ge-NQR study under pressure

Harada, Atsushi*; Kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Physica B; Condensed Matter, 378-380, p.963 - 964, 2006/05

 Times Cited Count:1 Percentile:6.65(Physics, Condensed Matter)

The superconducting characteristics on the itinerant ferromagnetic superconductor UGe$$_2$$ have been investigated via the $$^{73}$$Ge-NQR measurements under pressure ($$P$$) near the critical pressure $$P_x$$ where the first-order transition takes place from the low-temperature ($$T$$) and low-$$P$$ ferromagnetic phase (FM2) to high-$$T$$ and high-$$P$$ one (FM1). The measurements of nuclear spin-lattice relaxation rate $$T_1$$ have revealed a power-law like behavior as $$T^n$$ without the coherence peak, whereas at low temperatures, it deviates from the $$T^n$$ dependence to a $$T$$-linear like behavior. These results that depend on the pressure are well understood in terms of non-unitary spin-triplet pairing state where the ferromagnetic up-spin band is gapped, but the down-spin band remains gapless at the Fermi level. We will argue an intimate relationship of the onset of SC with FM1 and FM2.

Journal Articles

Cooperative phenomenon of ferromagnetism and unconventional superconductivity in UGe$$_2$$; A $$^{73}$$Ge-NQR study under pressure

Harada, Atsuyuki*; Kawasaki, Shinji*; Kotegawa, Hisashi*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Journal of the Physical Society of Japan, 74(10), p.2675 - 2678, 2005/10

 Times Cited Count:20 Percentile:68.7(Physics, Multidisciplinary)

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