Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5

Guguchia，Z.1; Mielke，C.1; Das，D.1; Gupta，R.1; Yin，J. X.2; Liu，H.3,4; Yin，Q.5; Christensen，M. H.6; Tu，Z.5; Gong，C.5; Shumiya，N.7; Hossain，Md Shafayat7; Gamsakhurdashvili，Ts1; Elender，M.1; Dai，Pengcheng8; Amato，A.1; Shi，Y.3,4; Lei，H. C.5; Fernandes，R. M.9; Hasan，M. Z.7,10,11,12; Luetkens，H.1; Khasanov，R.1

2023-12-01

10.1038/s41467-022-35718-z

Nature Communications   Impact Factor & Quartile

2041-1723

Unconventional superconductors often feature competing orders, small superfluid density, and nodal electronic pairing. While unusual superconductivity has been proposed in the kagome metals AVSb, key spectroscopic evidence has remained elusive. Here we utilize pressure-tuned and ultra-low temperature muon spin spectroscopy to uncover the unconventional nature of superconductivity in RbVSb and KVSb. At ambient pressure, we observed time-reversal symmetry breaking charge order below T1*≃ 110 K in RbVSb with an additional transition at T2*≃ 50 K. Remarkably, the superconducting state displays a nodal energy gap and a reduced superfluid density, which can be attributed to the competition with the charge order. Upon applying pressure, the charge-order transitions are suppressed, the superfluid density increases, and the superconducting state progressively evolves from nodal to nodeless. Once optimal superconductivity is achieved, we find a superconducting pairing state that is not only fully gapped, but also spontaneously breaks time-reversal symmetry. Our results point to unprecedented tunable nodal kagome superconductivity competing with time-reversal symmetry-breaking charge order and offer unique insights into the nature of the pairing state.

SCI

English

NI Journal Papers ; ESI Highly Cited Papers ; NI论文

Others

Gordon and Betty Moore Foundation["GBMF4547","GBMF9461"] ; US Department of Energy under the Basic Energy Sciences program[DOE/BES DE-FG-02-05ER46200] ; National Natural Science Foundation of China[U2032204] ; Strategic Priority Research Program(B) of the Chinese Academy of Sciences[XDB33000000] ; Ministry of Science and Technology of China[2018YFE0202600] ; Beijing Natural Science Foundation[Z200005] ; Swiss National Science Foundation[200021-175935] ; Air Force Office of Scientific Research[FA9550-21-1-0423] ; U.S. DOE BES[DE-SC0012311]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000991281000005

NATURE PORTFOLIO

2-s2.0-85146141175

Scopus

1.Laboratory for Muon Spin Spectroscopy,Paul Scherrer Institute,Villigen PSI,CH-5232,Switzerland
2.Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China
4.University of Chinese Academy of Sciences,Beijing,100049,China
5.Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices,Renmin University of China,Beijing,100872,China
6.Niels Bohr Institute,University of Copenhagen,Copenhagen,2100,Denmark
7.Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7),Department of Physics,Princeton University,Princeton,08544,United States
8.Department of Physics and Astronomy,Rice University,Houston,77005,United States
9.School of Physics and Astronomy,University of Minnesota,Minneapolis,55455,United States
10.Princeton Institute for the Science and Technology of Materials,Princeton University,Princeton,08540,United States
11.Materials Sciences Division,Lawrence Berkeley National Laboratory,Berkeley,94720,United States
12.Quantum Science Center,Oak Ridge,TN,37831,United States

Guguchia，Z.,Mielke，C.,Das，D.,et al. Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5[J]. Nature Communications,2023,14(1).

Guguchia，Z..,Mielke，C..,Das，D..,Gupta，R..,Yin，J. X..,...&Khasanov，R..(2023).Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5.Nature Communications,14(1).

Guguchia，Z.,et al."Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5".Nature Communications 14.1(2023).