Microscopic Coexistence of Ferromagnetism and Superconductivity in Single-Crystal UCoGe - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: Unambiguous evidence for the microscopic coexistence of ferromagnetism andsuperconductivity in UCoGe $T { m Curie} \sim 2.5$ K and $T { m SC}$ $\sim$0.6 K is reported from $^{59}$Co nuclear quadrupole resonance NQR. The$^{59}$Co-NQR signal below 1 K indicates ferromagnetism throughout the samplevolume, while nuclear spin-lattice relaxation rate $1-T 1$ in the ferromagneticFM phase decreases below $T { m SC}$ due to the opening of thesuperconductingSC gap. The SC state was found to be inhomogeneous, suggestiveof a self-induced vortex state, potentially realizable in a FM superconductor.In addition, the $^{59}$Co-NQR spectrum around $T { m Curie}$ show that the FMtransition in UCoGe possesses a first-order character, which is consistent withthe theoretical prediction that the low-temperature FM transition in itinerantmagnets is generically of first-order.



Autor: Tetsuya Ohta, Taisuke Hattori, Kenji Ishida, Yusuke Nakai, Eisuke Osaki, Kazuhiko Deguchi, Noriaki K. Sato, Isamu Satoh

Fuente: https://arxiv.org/







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