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Spectral evidence for unidirectional charge density wave in detwinned BaNi2As2

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [2];  [4];  [5];  [6];  [2];  [7];  [7];  [8];  [9];  [9];  [10];  [11];  [11];  [10];  [10];  [10];  [10] more »;  [12];  [2];  [13];  [4];  [2];  [2] « less
  1. Rice Univ., Houston, TX (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  2. Rice Univ., Houston, TX (United States)
  3. Rice Univ., Houston, TX (United States); Univ. of California, Berkeley, CA (United States)
  4. Univ. of Missouri, Columbia, MO (United States)
  5. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. Univ. of Oxford (United Kingdom)
  7. Canadian Light Source, Inc. (Canada)
  8. Univ. of British Columbia, Vancouver, BC (Canada); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  9. Univ. of British Columbia, Vancouver, BC (Canada)
  10. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  11. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  12. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  13. Univ. of California, Berkeley, CA (United States)
+ Show Author Affiliations
In the iron-based superconductors, unconventional superconductivity emerges in proximity to intertwined electronic orders consisting of an electronic nematic order and a spin density wave (SDW). Recently, BaNi2As2, like its well-known iron-based analog BaFe2As2, has been discovered to host a symmetry-breaking structural transition but coupled to a unidirectional charge density wave (CDW) instead of SDW, providing a novel platform to study intertwined orders. Here, in this work, through a systematic angle-resolved photoemission spectroscopy study combined with a detwinning B1g uniaxial strain, we identify distinct spectral evidence of band evolution due to the structural transition as well as CDW-induced band folding. In contrast to the nematicity and spin density wave in BaFe2As2, the structural and CDW order parameters in BaNi2As2 are observed to be strongly coupled and do not separate in the presence of uniaxial strain. Furthermore, no nematic band splitting is resolved above the structural transition. Our measurements point to a likely lattice origin of the CDW order in BaNi2As2.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Gordon and Betty Moore Foundation; Robert A. Welch Foundation; 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; AC02-76SF00515; AC05-00OR22725; SC0012311; SC0019114
OSTI ID:
1994731
Alternate ID(s):
OSTI ID: 2404329
OSTI ID: 2507457
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 8 Vol. 108; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)

FIG. 1(p. 2)figure FIG. 1
FIG. 2(p. 3)figure FIG. 2
FIG. 3(p. 3)figure FIG. 3
FIG. 4(p. 4)figure FIG. 4

Similar Records

Symmetry-Breaking Orbital Anisotropy Observed for Detwinned Ba(Fe1-xCox)2As2 above the Spin Density Wave Transition
Journal Article · Fri Aug 19 00:00:00 EDT 2011 · Submitted to Proceedings of National Academy of Science · OSTI ID:1022459

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
angle-resolved photoemission spectroscopy
charge density waves
iron-based superconductors
nematic phase transition