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Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals

Journal Article · · npj Quantum Materials
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [6];  [2];  [2];  [2];  [7];  [8];  [8];  [9];  [9];  [7];  [10];  [2];  [11] more »;  [6];  [5];  [1];  [4];  [2];  [1] « less
  1. Boston College, Chestnut Hill, MA (United States)
  2. Rice Univ., Houston, TX (United States)
  3. Rice Univ., Houston, TX (United States); Univ. of California, Berkeley, CA (United States)
  4. Weizmann Institute of Science, Rehovot (Israel)
  5. Univ. of California, Santa Barbara, CA (United States)
  6. Univ. of Washington, Seattle, WA (United States)
  7. Ames Laboratory (AMES), Ames, IA (United States)
  8. Univ. of Saskatchewan, Saskatoon, SK (Canada). Canadian Light Source, Inc.
  9. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  10. Consiglio Nazionale delle Ricerche (CNR-IOM), Trieste (Italy); Ca' Foscari Univ. of Venice (Italy)
  11. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
Charge density waves (CDWs) in kagome metals have been tied to many exotic phenomena. Here, using spectroscopic-imaging scanning tunneling microscopy and angle-resolved photoemission spectroscopy, we study the charge order in kagome metal ScV6Sn6. The similarity of electronic band structures of ScV6Sn6 and TbV6Sn6 (where charge ordering is absent) suggests that charge ordering in ScV6Sn6 is unlikely to be primarily driven by Fermi surface nesting of the Van Hove singularities. In contrast to the CDW state of cousin kagome metals, we find no evidence supporting rotation symmetry breaking. Differential conductance dI/dV spectra show a partial gap Δ1CO ≈ 20 meV at the Fermi level. Interestingly, dI/dV maps reveal that charge modulations exhibit an abrupt phase shift as a function of energy at energy much higher than Δ1CO, which we attribute to another spectral gap. Our experiments reveal a distinctive nature of the charge order in ScV6Sn6 with fundamental differences compared to other kagome metals.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; AC02-07CH11358; AC02-76SF00515; FG02-99ER45747; SC0021421
OSTI ID:
2294094
Report Number(s):
IS-J--11,256
Journal Information:
npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 9; ISSN 2397-4648
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)

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Related Subjects

36 MATERIALS SCIENCE
electronic properties and materials
topological matter