{"title":"卡戈米超导体 CsV3Sb5 Little-Parks 设置中难以捉摸的 $${\\phi }_{0}/3={hc}/6e$$ 振荡的希格斯-莱格特机制","authors":"Ling-Feng Zhang, Zhi Wang, Xiao Hu","doi":"10.1038/s42005-024-01663-0","DOIUrl":null,"url":null,"abstract":"A recent Little-Parks experiment in Kagome-structured superconductor CsV3Sb5 demonstrated resistance oscillations with period $${\\phi }_{0}/3={hc}/6e$$ . Here, we perform analysis based on a theory involving three $$2{{{{{\\rm{e}}}}}}$$ superconductivity (SC) order parameters associated with the three reciprocal lattice vectors which connect M points of the hexagonal Brillouin zone. In a ring geometry we find that, as a series of intermediate states, phase of one SC order parameter winds 2π more or less than the other two ones around the ring, which yields local free-energy minima at integer multiples of $${\\phi }_{0}/3$$ . It is unveiled that the ground-state degeneracy associated with a Z2 chirality is crucial, and the Higgs-Leggett mechanism stabilizes domain walls (DWs) between chiral domains. At low temperatures DWs are expelled from the system resulting in free-energy minima only at integer multiples of $${\\phi }_{0}$$ . Our theory explains successfully the fractional quantization of magnetic flux $${\\phi }_{0}/3$$ observed in experiments, which opens a door for approaching rich physics of Kagome superconductors. Recent experiments on the Kagome superconductor (SC) CsV3Sb5 indicated 6e-charge flux quantization, which may impact our understanding of the electron pairing in SCs. The authors propose a multicomponent Landau-Ginzburg theory to explain the observed phenomenon, concluding that it is likely related to an exotic Higgs-Leggett collective mode involving three Cooper pairs in an intermediate phase.","PeriodicalId":10540,"journal":{"name":"Communications Physics","volume":null,"pages":null},"PeriodicalIF":5.4000,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s42005-024-01663-0.pdf","citationCount":"0","resultStr":"{\"title\":\"Higgs-Leggett mechanism for the elusive $${\\\\phi }_{0}/3={hc}/6e$$ oscillation in Little-Parks setup of Kagome superconductor CsV3Sb5\",\"authors\":\"Ling-Feng Zhang, Zhi Wang, Xiao Hu\",\"doi\":\"10.1038/s42005-024-01663-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A recent Little-Parks experiment in Kagome-structured superconductor CsV3Sb5 demonstrated resistance oscillations with period $${\\\\phi }_{0}/3={hc}/6e$$ . Here, we perform analysis based on a theory involving three $$2{{{{{\\\\rm{e}}}}}}$$ superconductivity (SC) order parameters associated with the three reciprocal lattice vectors which connect M points of the hexagonal Brillouin zone. In a ring geometry we find that, as a series of intermediate states, phase of one SC order parameter winds 2π more or less than the other two ones around the ring, which yields local free-energy minima at integer multiples of $${\\\\phi }_{0}/3$$ . It is unveiled that the ground-state degeneracy associated with a Z2 chirality is crucial, and the Higgs-Leggett mechanism stabilizes domain walls (DWs) between chiral domains. At low temperatures DWs are expelled from the system resulting in free-energy minima only at integer multiples of $${\\\\phi }_{0}$$ . Our theory explains successfully the fractional quantization of magnetic flux $${\\\\phi }_{0}/3$$ observed in experiments, which opens a door for approaching rich physics of Kagome superconductors. Recent experiments on the Kagome superconductor (SC) CsV3Sb5 indicated 6e-charge flux quantization, which may impact our understanding of the electron pairing in SCs. The authors propose a multicomponent Landau-Ginzburg theory to explain the observed phenomenon, concluding that it is likely related to an exotic Higgs-Leggett collective mode involving three Cooper pairs in an intermediate phase.\",\"PeriodicalId\":10540,\"journal\":{\"name\":\"Communications Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.4000,\"publicationDate\":\"2024-06-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.nature.com/articles/s42005-024-01663-0.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Communications Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.nature.com/articles/s42005-024-01663-0\",\"RegionNum\":1,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Communications Physics","FirstCategoryId":"101","ListUrlMain":"https://www.nature.com/articles/s42005-024-01663-0","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
Higgs-Leggett mechanism for the elusive $${\phi }_{0}/3={hc}/6e$$ oscillation in Little-Parks setup of Kagome superconductor CsV3Sb5
A recent Little-Parks experiment in Kagome-structured superconductor CsV3Sb5 demonstrated resistance oscillations with period $${\phi }_{0}/3={hc}/6e$$ . Here, we perform analysis based on a theory involving three $$2{{{{{\rm{e}}}}}}$$ superconductivity (SC) order parameters associated with the three reciprocal lattice vectors which connect M points of the hexagonal Brillouin zone. In a ring geometry we find that, as a series of intermediate states, phase of one SC order parameter winds 2π more or less than the other two ones around the ring, which yields local free-energy minima at integer multiples of $${\phi }_{0}/3$$ . It is unveiled that the ground-state degeneracy associated with a Z2 chirality is crucial, and the Higgs-Leggett mechanism stabilizes domain walls (DWs) between chiral domains. At low temperatures DWs are expelled from the system resulting in free-energy minima only at integer multiples of $${\phi }_{0}$$ . Our theory explains successfully the fractional quantization of magnetic flux $${\phi }_{0}/3$$ observed in experiments, which opens a door for approaching rich physics of Kagome superconductors. Recent experiments on the Kagome superconductor (SC) CsV3Sb5 indicated 6e-charge flux quantization, which may impact our understanding of the electron pairing in SCs. The authors propose a multicomponent Landau-Ginzburg theory to explain the observed phenomenon, concluding that it is likely related to an exotic Higgs-Leggett collective mode involving three Cooper pairs in an intermediate phase.
期刊介绍:
Communications Physics is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the physical sciences. Research papers published by the journal represent significant advances bringing new insight to a specialized area of research in physics. We also aim to provide a community forum for issues of importance to all physicists, regardless of sub-discipline.
The scope of the journal covers all areas of experimental, applied, fundamental, and interdisciplinary physical sciences. Primary research published in Communications Physics includes novel experimental results, new techniques or computational methods that may influence the work of others in the sub-discipline. We also consider submissions from adjacent research fields where the central advance of the study is of interest to physicists, for example material sciences, physical chemistry and technologies.