English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Co nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR)studies were performed in the recently discovered UCoGe, in which theferromagnetic and superconducting (SC) transitions were reported to occur at$T_{\rm Curie} \sim 3$ K and $T_S \sim 0.8$ K (N. T. Huy {\it et al.}, Phys.Rev. Lett. {\bf 99} (2007) 067006), in order to investigate the coexistence offerromagnetism and superconductivity as well as the normal-state and SCproperties from a microscopic point of view. From the nuclear spin-latticerelaxation rate $1/T_1$ and Knight-shift measurements, we confirmed thatferromagnetic fluctuations which possess a quantum critical character arepresent above $T_{\rm Curie}$ and the occurrence of ferromagnetic transition at2.5 K in our polycrystalline sample. The magnetic fluctuations in the normalstate show that UCoGe is an itinerant ferromagnet similar to ZrZn$_2$ andYCo$_2$. The onset SC transition was identified at $T_S \sim 0.7$ K, belowwhich $1/T_1$ of 30 % of the volume fraction starts to decrease due to theopening of the SC gap. This component of $1/T_1$, which follows a $T^3$dependence in the temperature range of $0.3 - 0.1$ K, coexists with themagnetic components of $1/T_1$ showing a $\sqrt{T}$ dependence below $T_S$.  From the NQR measurements in the SC state, we suggest that the self-inducedvortex state is realized in UCoGe.

journal of the physical society of japan

Ferromagnetic Quantum Critical Fluctuations and Anomalous Coexistence of  Ferromagnetism and Superconductivity in UCoGe Revealed by Co-NMR and NQR  Studies