Zurab Guguchia
(PSI - Paul Scherrer Institut)
We utilized pressure-tuned and ultra-low-temperature muon-spin spectroscopy to uncover the unconventional nature of superconductivity in kagome metals (Rb,K)V$_{3}$Sb$_{5}$[1,2]. At ambient pressure, the superconducting state displays a nodal energy gap and a reduced superfluid density, which is attributed to the competition with the charge order. Upon applying pressure, the charge-order is suppressed, the superfluid density increases, and the superconducting state 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 offer unique insights into the nature of the pairing state.
[1]Mielke-et.al., and Guguchia, Nature 602, 245(2022).
[2]Guguchia-et.al., Nature Communications 14, 153(2023).
Zurab Guguchia
(PSI - Paul Scherrer Institut)
Charles Mielke III
(Paul Scherrer Institut)
Dr
Debarchan Das
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Dr
Ritu Gupta
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Dr
J.-X. Yin
(Department of physics, Southern University of Science and Technology, Shenzhen, China)
Mr
H. Liu
(University of Chinese Academy of Sciences, Beijing 100049, China.)
Mr
Q. Yin
(Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China)
Dr
M.H. Christensen
(Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark)
Z. Tu
(Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China)
C. Gong
(Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China)
Ms
N. Shumyia
(Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey 08544, USA)
Dr
Md. S. Hossain
(Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey 08544, USA)
Ts. Gamsakhurdashvili
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
M. Elender
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
P. Dai
(Department of Physics and Astronomy, Rice Center for Quantum Materials, Rice University, Houston, TX, USA)
Dr
A. Amato
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Y. Shi
(University of Chinese Academy of Sciences, Beijing 100049, China.)
Prof.
H. Lei
(Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China)
R.M. Fernandes
(School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA)
M.Z. Hasan
(Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey 08544, USA)
Dr
H. Luetkens
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
Dr
R. Khasanov
(Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)
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