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Journal Articles

$$^{239}$$Pu nuclear magnetic resonance in the candidate topological insulator PuB$$_4$$

Dioguardi, A. P.*; Yasuoka, Hiroshi*; Thomas, S. M.*; Sakai, Hironori; Cary, S. K.*; Kozimor, S. A.*; Albrecht-Schmitt, T. E.*; Choi, H. C.*; Zhu, J.-X.*; Thompson, J. D.*; et al.

Physical Review B, 99(3), p.035104_1 - 035104_6, 2019/01

https://doi.org/10.1103/PhysRevB.99.035104
 Times Cited Count：10 Percentile：43.45(Materials Science, Multidisciplinary)

We present a detailed nuclear magnetic resonance (NMR) study of $$^{239}$$Pu in bulk and powdered single-crystal plutonium tetraboride (PuB$$_4$$), which has recently been investigated as a potential correlated topological insulator. The $$^{239}$$Pu NMR spectra are consistent with axial symmetry of the shift tensor showing for the first time that $$^{239}$$Pu NMR can be observed in an anisotropic environment and up to room temperature. The temperature dependence of the $$^{239}$$Pu shift, combined with a relatively long spin-lattice relaxation time ($$T_1$$), indicate that PuB$$_4$$ adopts a nonmagnetic state with gaplike behavior consistent with our density functional theory calculations. The temperature dependencies of the NMR Knight shift and $$T^{-1}$$ imply bulk gaplike behavior confirming that PuB$$_4$$ is a good candidate topological insulator.

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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