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Title: Evolution of nontrivial Fermi surface features in the band structures of the homologous members Pb 5 Bi 6 Se 14 and Pb 5 Bi 12 Se 23

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

High-quality single crystals of (PbSe)5(Bi2Se3)3m were grown and analyzed by nuclear magnetic resonance (NMR) spectroscopy. We report on 77Se and 207Pb NMR shifts and nuclear spin-lattice relaxation measurements in the naturally formed heterostructure homology (PbSe)5(Bi2Se3)3m with m = 1 (Pb5Bi6Se14) and m = 2 (Pb5Bi12Se23). A distinct site-specific contribution has been detected for both nuclei as a function of temperature, which reveals an electronic changeover from a semiconducting (Pb5Bi6Se14) to a semimetalliclike (Pb5Bi12Se23) system with nontrivial band structure features near the Fermi level. The temperature dependences of the relaxation rates are dominated by significant changes in the topology of energy dispersions accompanied with band edges and crossings in the region of the Fermi surface. These results, which interrogate nuclear spin interactions from selected atomic sites, clearly expose the effects of the added Bi2Se3 layer on the crystal and electronic structure of (Pb5Bi12Se23). These findings provide direct microscopic insight into the unconventional and dual nature of the electronic structure of these homologous thermoelectric and topologically nontrivial compounds.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
U.S. Department of Defense (DOD) - Defense Advanced Research Projects Agency (DARPA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1616697
Alternate ID(s):
OSTI ID: 1607616
Journal Information:
Physical Review B, Vol. 101, Issue 11; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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Figures / Tables (6)


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