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Depth-dependent study of time-reversal symmetry-breaking in the kagome superconductor AV3Sb5

Graham, J. N. LU ; Mielke, Charles ; Das, D. ; Morresi, T. ; Sazgari, V. ; Suter, A. ; Prokscha, T. ; Deng, H. ; Khasanov, R. and Wilson, S. D. , et al. (2024) In Nature Communications 15(1).
Abstract

The breaking of time-reversal symmetry (TRS) in the normal state of kagome superconductors AV3Sb5 stands out as a significant feature, but its tunability is unexplored. Using low-energy muon spin rotation and local field numerical analysis, we study TRS breaking as a function of depth in single crystals of RbV3Sb5 (with charge order) and Cs(V0.86Ta0.14)3Sb5 (without charge order). In the bulk of RbV3Sb5 (>33 nm from the surface), we observed an increase in the internal magnetic field width in the charge-ordered state. Near the surface (<33 nm), the muon spin relaxation rate is significantly enhanced and this effect... (More)

The breaking of time-reversal symmetry (TRS) in the normal state of kagome superconductors AV3Sb5 stands out as a significant feature, but its tunability is unexplored. Using low-energy muon spin rotation and local field numerical analysis, we study TRS breaking as a function of depth in single crystals of RbV3Sb5 (with charge order) and Cs(V0.86Ta0.14)3Sb5 (without charge order). In the bulk of RbV3Sb5 (>33 nm from the surface), we observed an increase in the internal magnetic field width in the charge-ordered state. Near the surface (<33 nm), the muon spin relaxation rate is significantly enhanced and this effect commences at temperatures significantly higher than the onset of charge order. In contrast, no similar field width enhancement was detected in Cs(V0.86Ta0.14)3Sb5, either in the bulk or near the surface. These observations indicate a strong connection between charge order and TRS breaking and suggest that TRS breaking can occur prior to long-range charge order.

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publishing date
type
Contribution to journal
publication status
published
in
Nature Communications
volume
15
issue
1
article number
8978
publisher
Nature Publishing Group
external identifiers
  • scopus:85206622939
  • pmid:39419975
ISSN
2041-1723
DOI
10.1038/s41467-024-52688-6
language
English
LU publication?
no
additional info
Publisher Copyright: © The Author(s) 2024.
id
bb0e6bf1-edf1-40a3-a8e5-2ae7e6ae1557
date added to LUP
2026-05-28 17:39:17
date last changed
2026-06-11 20:20:45
@article{bb0e6bf1-edf1-40a3-a8e5-2ae7e6ae1557,
  abstract     = {{<p>The breaking of time-reversal symmetry (TRS) in the normal state of kagome superconductors AV<sub>3</sub>Sb<sub>5</sub> stands out as a significant feature, but its tunability is unexplored. Using low-energy muon spin rotation and local field numerical analysis, we study TRS breaking as a function of depth in single crystals of RbV<sub>3</sub>Sb<sub>5</sub> (with charge order) and Cs(V<sub>0.86</sub>Ta<sub>0.14</sub>)<sub>3</sub>Sb<sub>5</sub> (without charge order). In the bulk of RbV<sub>3</sub>Sb<sub>5</sub> (&gt;33 nm from the surface), we observed an increase in the internal magnetic field width in the charge-ordered state. Near the surface (&lt;33 nm), the muon spin relaxation rate is significantly enhanced and this effect commences at temperatures significantly higher than the onset of charge order. In contrast, no similar field width enhancement was detected in Cs(V<sub>0.86</sub>Ta<sub>0.14</sub>)<sub>3</sub>Sb<sub>5</sub>, either in the bulk or near the surface. These observations indicate a strong connection between charge order and TRS breaking and suggest that TRS breaking can occur prior to long-range charge order.</p>}},
  author       = {{Graham, J. N. and Mielke, Charles and Das, D. and Morresi, T. and Sazgari, V. and Suter, A. and Prokscha, T. and Deng, H. and Khasanov, R. and Wilson, S. D. and Salinas, A. C. and Martins, M. M. and Zhong, Y. and Okazaki, K. and Wang, Z. and Hasan, M. Z. and Fischer, M. H. and Neupert, T. and Yin, J. X. and Sanna, S. and Luetkens, H. and Salman, Z. and Bonfà, P. and Guguchia, Z.}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Depth-dependent study of time-reversal symmetry-breaking in the kagome superconductor AV<sub>3</sub>Sb<sub>5</sub>}},
  url          = {{http://dx.doi.org/10.1038/s41467-024-52688-6}},
  doi          = {{10.1038/s41467-024-52688-6}},
  volume       = {{15}},
  year         = {{2024}},
}