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Charge order landscape and competition with superconductivity in kagome metals

Journal Article · · Nature Materials
 [1];  [2];  [3];  [4];  [4];  [3];  [5];  [6];  [5];  [5];  [5];  [7];  [2];  [4];  [3];  [2]
  1. Max Planck POSTECH/Korea Research Initiative, Pohang (Korea, Republic of); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Max Planck POSTECH/Korea Research Initiative, Pohang (Korea, Republic of); Pohang University of Science and Technology, Pohang (Korea, Republic of)
  4. University of California, Santa Barbara, CA (United States)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. Institute for Basic Science (IBS), Pohang (Korea, Republic of)
  7. Harvard University, Cambridge, MA (United States)

In the kagome metals AV3Sb5 (A = K, Rb, Cs), three-dimensional charge order is the primary instability that sets the stage for other collective orders to emerge, including unidirectional stripe order, orbital flux order, electronic nematicity and superconductivity. In this report we use high-resolution angle-resolved photoemission spectroscopy to determine the microscopic structure of three-dimensional charge order in AV3Sb5 and its interplay with superconductivity. Our approach is based on identifying an unusual splitting of kagome bands induced by three-dimensional charge order, which provides a sensitive way to refine the spatial charge patterns in neighbouring kagome planes. Here we found a marked dependence of the three-dimensional charge order structure on composition and doping. The observed difference between CsV3Sb5 and the other compounds potentially underpins the double-dome superconductivity in CsV3(Sb,Sn)5 and the suppression of Tc in KV3Sb5 and RbV3Sb5. Our results provide fresh insights into the rich phase diagram of AV3Sb5.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); Gordon and Betty Moore Foundation; National Research Foundation of Korea
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2278637
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 2 Vol. 22; ISSN 1476-1122
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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