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Journal Articles

Paramagnetic state of the kagome Kondo lattice compound YbV$$_6$$Sn$$_6$$; A $$^{51}$$V nuclear magnetic resonance study

Park, S.*; Sakai, Hironori; Hosoi, Suguru*; Thomas, S. M.*; Kambe, Shinsaku*; Tokunaga, Yo; Dioguardi, A. P.*; Thompson, J. D.*; Ronning, F.*; Kimata, Motoi; et al.

Physical Review B, 113(15), p.155107_1 - 155107_9, 2026/04

https://doi.org/10.1103/6789-mw95

YbV$$_6$$Sn$$_6$$ is a Kondo lattice compound with a layered structure composed of a triangular lattice of Yb$$^{3+}$$ ions and a vanadium-based kagome network, and it orders antiferromagnetically at $$T_{rm N}approx 0.4$$ K. We performed a $$^{51}$$V-NMR study of its paramagnetic state. The field-angular dependence of single-crystal NMR spectra allowed us to determine the principal axes of the electric field gradient tensor, the quadrupole frequency $$nu_{rm Q}$$, and the asymmetry parameter $$eta$$ at the $$^{51}$$V sites. Knight-shift and susceptibility analyses revealed anisotropic hyperfine couplings, while the spin-lattice relaxation rate $$1/T_1$$ showed enhanced low-energy spin fluctuations below $$sim20$$~K with strong in-plane anisotropy. A further field-tunable enhancement below $$sim10$$~K suggests proximity to the very-low-temperature antiferromagnetic instability.

Oral presentation

Magnetic fluctuations in strongly correlated $$f$$ electrons system URu$$_2$$Si$$_2$$ under high fields

Sakai, Hironori; Higa, Nonoka; Hattori, Taisuke; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Goto, Takayuki*; Hirata, Michihiro*; Awaji, Satoshi*; Sasaki, Takahiko*

no journal, , 

We have performed $$^{29}$$Si nuclear magnetic resonance (NMR) experiments using single crystal of strongly correlated $$5f$$ electrons system URu$$_2$$Si$$_2$$ under high external field of about 24 T. The temperature dependence of NMR shift in the paramagnetic state varies with external fields. The temperature and field dependences of NMR shifts resembles those of magnetic susceptibility.

Oral presentation

$$^{51}$$V nuclear magnetic resonance study of the triangular Kondo lattice system YbV$$_6$$Sn$$_6$$

Sakai, Hironori; Park, S.*; Dioguardi, A. P.*; Furukawa, Tetsuya*; Sasaki, Takahiko*; Kimata, Motoi; Kambe, Shinsaku; Tokunaga, Yo; Thomas, S. M.*; Thompson, J. D.*; et al.

no journal, , 

YbV$$_6$$Sn$$_6$$ has a HfFe$$_6$$Ge$$_6$$-type structure, in which V atoms form a Kagome lattice and Yb atoms form a triangular lattice. This rare Yb-based Kondo triangular lattice system has attracted much attention as an essential model to explore the relationship between quantum magnetism and topological properties. To microscopically clarify the quantum criticality of this system, we have performed $$^{51}$$V nuclear magnetic resonance (NMR) studies using a single crystal of YbV$$_6$$Sn$$_6$$. In this talk, I will report on the spectral assignments of $$^{51}$$V nuclei revealed from $$^{51}$$V NMR measurements in the paramagnetic state.

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