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DOE OSTI · 2574373

Unconventional gapping behaviour in a kagome superconductor

Hossain, Md Shafayat [Princeton University, NJ (United States)] (ORCID:0000000237445877)·Zhang, Qi [Princeton University, NJ (United States)]·Choi, Eun Sang [National High Magnetic Field Laboratory, Tallahassee, FL (United States)]·Ratkovski, Danilo [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:0000000282189382)·Lüscher, Bernhard [University of Zurich (Switzerland)]·Li, Yongkai [Beijing Institute of Technology (China); Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing (China)]·Jiang, Yu-Xiao [Princeton University, NJ (United States)] (ORCID:0000000279583100)·Litskevich, Maksim [Princeton University, NJ (United States)] (ORCID:0000000330496521)·Cheng, Zi-Jia [Princeton University, NJ (United States)]·Yin, Jia-Xin [Princeton University, NJ (United States)] (ORCID:0000000326614206)·Cochran, Tyler A. [Princeton University, NJ (United States)] (ORCID:0000000317458467)·Casas, Brian [National High Magnetic Field Laboratory, Tallahassee, FL (United States)]·Kim, Byunghoon [Princeton University, NJ (United States)] (ORCID:0000000189494833)·Yang, Xian [Princeton University, NJ (United States)] (ORCID:000000025019374X)·Liu, Jinjin [Beijing Institute of Technology (China); Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing (China)]·Yao, Yugui [Beijing Institute of Technology (China)] (ORCID:0000000335443787)·Bangura, Alimamy F. [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:000000021040344X)·Wang, Zhiwei [Beijing Institute of Technology (China); Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing (China)] (ORCID:0000000301822471)·Fischer, Mark H. [University of Zurich (Switzerland)] (ORCID:0000000308106064)·Neupert, Titus [University of Zurich (Switzerland)] (ORCID:000000030604041X)·Balicas, Luis [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:0000000252090293)·Hasan, M. Zahid [Princeton University, NJ (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000197303128)
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Abstract

Determining the types of superconducting order in quantum materials is a challenge. This is especially true when several degrees of freedom contribute to the fermiology and when superconductivity competes with other symmetry-breaking orders. One example is the kagome-lattice superconductor CsV 3 Sb 5 , in which multiband superconductivity coexists with a charge order that substantially reduces the space group symmetries of the compound. Here we demonstrate the presence of two superconducting regimes in CsV 3 Sb 5 that are characterized by distinct transport and thermodynamic properties. Our results reveal a substantial quasiparticle weight in a high-temperature regime. At lower temperatures, this weight is removed through the formation of a second gap. We argue that the band with a gap opening at lower temperatures continues to host low-energy quasiparticles, possibly due to the nodal structure of the gap. Taken together, our results present evidence for band-selective superconductivity with uncoupled superconducting gaps.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYSuperconducting properties and materialsTopological matter

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Hossain, Md Shafayat [Princeton University, NJ (United States)] (ORCID:0000000237445877), Zhang, Qi [Princeton University, NJ (United States)], Choi, Eun Sang [National High Magnetic Field Laboratory, Tallahassee, FL (United States)], Ratkovski, Danilo [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:0000000282189382), Lüscher, Bernhard [University of Zurich (Switzerland)], Li, Yongkai [Beijing Institute of Technology (China); Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing (China)], Jiang, Yu-Xiao [Princeton University, NJ (United States)] (ORCID:0000000279583100), Litskevich, Maksim [Princeton University, NJ (United States)] (ORCID:0000000330496521), Cheng, Zi-Jia [Princeton University, NJ (United States)], Yin, Jia-Xin [Princeton University, NJ (United States)] (ORCID:0000000326614206), Cochran, Tyler A. [Princeton University, NJ (United States)] (ORCID:0000000317458467), Casas, Brian [National High Magnetic Field Laboratory, Tallahassee, FL (United States)], Kim, Byunghoon [Princeton University, NJ (United States)] (ORCID:0000000189494833), Yang, Xian [Princeton University, NJ (United States)] (ORCID:000000025019374X), Liu, Jinjin [Beijing Institute of Technology (China); Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing (China)], Yao, Yugui [Beijing Institute of Technology (China)] (ORCID:0000000335443787), Bangura, Alimamy F. [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:000000021040344X), Wang, Zhiwei [Beijing Institute of Technology (China); Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing (China)] (ORCID:0000000301822471), Fischer, Mark H. [University of Zurich (Switzerland)] (ORCID:0000000308106064), Neupert, Titus [University of Zurich (Switzerland)] (ORCID:000000030604041X), Balicas, Luis [National High Magnetic Field Laboratory, Tallahassee, FL (United States)] (ORCID:0000000252090293), Hasan, M. Zahid [Princeton University, NJ (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000197303128). 2025-02-28. Unconventional gapping behaviour in a kagome superconductor. https://doi.org/10.1038/s41567-024-02770-z

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