Tunable unconventional kagome superconductivity in charge ordered RbV 3 Sb 5 and KV 3 Sb 5 .

Autor: Guguchia Z; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland. zurab.guguchia@psi.ch., Mielke C 3rd; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland., Das D; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland., Gupta R; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland., Yin JX; Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China., Liu H; Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.; University of Chinese Academy of Sciences, 100049, Beijing, China., Yin Q; Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, 100872, Beijing, China., Christensen MH; Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark., Tu Z; Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, 100872, Beijing, China., Gong C; Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, 100872, Beijing, China., Shumiya N; Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, 08544, USA., Hossain MS; Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, 08544, USA., Gamsakhurdashvili T; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland., Elender M; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland., Dai P; Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA., Amato A; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland., Shi Y; Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.; University of Chinese Academy of Sciences, 100049, Beijing, China., Lei HC; Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, 100872, Beijing, China., Fernandes RM; School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA., Hasan MZ; Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ, 08544, USA.; Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, NJ, 08540, USA.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.; Quantum Science Center, Oak Ridge, TN, 37831, USA., Luetkens H; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland. hubertus.luetkens@psi.ch., Khasanov R; Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland. rustem.khasanov@psi.ch.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Jan 11; Vol. 14 (1), pp. 153. Date of Electronic Publication: 2023 Jan 11.
DOI: 10.1038/s41467-022-35718-z
Abstrakt: Unconventional superconductors often feature competing orders, small superfluid density, and nodal electronic pairing. While unusual superconductivity has been proposed in the kagome metals AV 3 Sb 5 , 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 RbV 3 Sb 5 and KV 3 Sb 5 . At ambient pressure, we observed time-reversal symmetry breaking charge order below [Formula: see text] 110 K in RbV 3 Sb 5 with an additional transition at [Formula: see text] 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.
(© 2023. The Author(s).)
Databáze: MEDLINE
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