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Sn; A 
V nuclear magnetic resonance studyPark, 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
Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)YbVSn is a Kondo lattice compound with a layered structure composed of a triangular lattice of Yb
ions and a vanadium-based kagome network, and it orders antiferromagnetically at 
K. We performed a 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 
, and the asymmetry parameter 
at the V sites. Knight-shift and susceptibility analyses revealed anisotropic hyperfine couplings, while the spin-lattice relaxation rate 
showed enhanced low-energy spin fluctuations below 
~K with strong in-plane anisotropy. A further field-tunable enhancement below 
~K suggests proximity to the very-low-temperature antiferromagnetic instability.
Doda, Norihiro; Hiyama, Tomoyuki; Tanaka, Masaaki; Ohshima, Hiroyuki; Thomas, J.*; Vilim, R. B.*
Proceedings of International Conference on Fast Reactors and Related Fuel Cycles; Next Generation Nuclear Systems for Sustainable Development (FR-17) (USB Flash Drive), 10 Pages, 2017/06
In sodium-cooled fast reactors, a natural circulation is expected to remove the core decay heat when the plant gets into a station blackout. From a perspective of reactor safety, the core hot spot temperature arising in the natural circulation should be evaluated accurately. To this end, Japan Atomic Energy Agency is trying to couple a 1-D plant dynamics analysis code Super-COPD and a 3-D CFD code AQUA to solve the thermal-hydraulic field in the whole plant under natural circulation condition. As a validation study, the coupled code was applied to an analysis of EBR-II shutdown heat removal test. The obtained numerical results reasonably agreed with the measured data, which demonstrated the validity of the coupled code.
Bulanov, S. S.*; Esirkepov, T. Zh.; Thomas, A. G. R.*; Koga, J. K.; Bulanov, S. V.
Physical Review Letters, 105(22), p.220407_1 - 220407_4, 2010/11
Times Cited Count：168 Percentile：96.02(Physics, Multidisciplinary)V nuclear magnetic resonance study of the triangular Kondo lattice system YbVSnSakai, 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, ,
YbVSn has a HfFeGe-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 V nuclear magnetic resonance (NMR) studies using a single crystal of YbVSn. In this talk, I will report on the spectral assignments of V nuclei revealed from V NMR measurements in the paramagnetic state.
