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Title: $$\mathrm{^{239}Pu}$$ nuclear magnetic resonance in the candidate topological insulator $$\mathrm{PuB_4}$$

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [3];  [3];  [5];  [3];  [3];  [3];  [3];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Leibniz Institute for Solid State and Materials Research (IFW) Dresden (Germany)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Japan Atomic Energy Agency, Tokai, Naka (Japan)
  5. Florida State Univ., Tallahassee, FL (United States)

In this article, we present a detailed nuclear magnetic resonance (NMR) study of $$\mathrm{^{239}Pu}$$ in bulk and powdered single-crystal plutonium tetraboride ($$\mathrm{PuB_4}$$), which has recently been investigated as a potential correlated topological insulator. This study constitutes the second-ever observation of the $$\mathrm{^{239}Pu}$$ NMR signal, and provides unique on-site sensitivity to the rich $$f$$-electron physics and insight into the bulk gaplike behavior in $$\mathrm{PuB_4}$$. The $$\mathrm{^{239}Pu}$$ NMR spectra are consistent with axial symmetry of the shift tensor showing for the first time that $$\mathrm{^{239}Pu}$$ NMR can be observed in an anisotropic environment and up to room temperature. The temperature dependence of the $$\mathrm{^{239}Pu}$$ shift, combined with a relatively long spin-lattice relaxation time ($$T_1$$), indicate that $$\mathrm{PuB_4}$$ adopts a nonmagnetic state with gaplike behavior consistent with our density functional theory calculations. The temperature dependencies of the NMR Knight shift and $$T_1^{1}$$ –microscopic quantities sensitive only to bulk states–imply bulk gaplike behavior confirming that $$\mathrm{PuB_4}$$ is a good candidate topological insulator. The large contrast between the $$\mathrm{^{239}Pu}$$ orbital shifts in the ionic insulator $$\mathrm{PuO_2} (\sim {+24.7 }\%)$$ and $$\mathrm{PuB_4} (\sim-0.5\%)$$ provides a new tool to investigate the nature of chemical bonding in plutonium materials.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST); Florida State Univ., Tallahassee, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016568
OSTI ID:
1566685
Alternate ID(s):
OSTI ID: 1489316
Journal Information:
Physical Review B, Vol. 99, Issue 3; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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