Jennifer N Graham, Shams Sohel Islam, Vahid Sazgari, Yongka Li, Hanbin Deng, Gianluca Janka, Yigui Zhong, Orion Gerguri, Petr Král, Andrin Doll, Izabela Biało, Johan Chang, Zaher Salman, Andreas Suter, Thomas Prokscha, Yugui Yao, Kozo Okazaki, Hubertus Luetkens, Rustem Khasanov, Zhiwei Wang, Jia-Xin Yin, Zurab Guguchia
{"title":"nb掺杂CsV3Sb5从手性荷序到时间反转对称破缺超导态的压力诱导转变。","authors":"Jennifer N Graham, Shams Sohel Islam, Vahid Sazgari, Yongka Li, Hanbin Deng, Gianluca Janka, Yigui Zhong, Orion Gerguri, Petr Král, Andrin Doll, Izabela Biało, Johan Chang, Zaher Salman, Andreas Suter, Thomas Prokscha, Yugui Yao, Kozo Okazaki, Hubertus Luetkens, Rustem Khasanov, Zhiwei Wang, Jia-Xin Yin, Zurab Guguchia","doi":"10.1038/s42005-025-02235-6","DOIUrl":null,"url":null,"abstract":"<p><p>Understanding how time-reversal symmetry (TRS) breaks in quantum materials is key to uncovering new states of matter and advancing quantum technologies. However, unraveling the interplay between TRS breaking, charge order, and superconductivity in kagome metals continues to be a compelling challenge. Here, we investigate the kagome metal Cs(V<sub>1-<i>x</i></sub> Nb <sub><i>x</i></sub> )<sub>3</sub>Sb<sub>5</sub> with <i>x</i> = 0.07 using muon spin rotation (<i>μ</i>SR), alternating current (AC) magnetic susceptibility, and scanning tunneling microscopy (STM), under combined tuning by chemical doping, hydrostatic pressure, magnetic field, and depth from the surface. We find that TRS breaking in the bulk emerges below 40 K-lower than the charge order onset at 58 K-while near the surface, TRS breaking onsets at 58 K and is twice as strong. Niobium doping raises the superconducting critical temperature from 2.5 K to 4.4 K. Under pressure, both the critical temperature and superfluid density double, with TRS-breaking superconductivity appearing above 0.85 GPa. These findings reveal a depth-tunable TRS-breaking state and unconventional superconducting behavior in kagome systems.</p>","PeriodicalId":10540,"journal":{"name":"Communications Physics","volume":"8 1","pages":"318"},"PeriodicalIF":5.8000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12317846/pdf/","citationCount":"0","resultStr":"{\"title\":\"Pressure induced transition from chiral charge order to time-reversal symmetry-breaking superconducting state in Nb-doped CsV<sub>3</sub>Sb<sub>5</sub>.\",\"authors\":\"Jennifer N Graham, Shams Sohel Islam, Vahid Sazgari, Yongka Li, Hanbin Deng, Gianluca Janka, Yigui Zhong, Orion Gerguri, Petr Král, Andrin Doll, Izabela Biało, Johan Chang, Zaher Salman, Andreas Suter, Thomas Prokscha, Yugui Yao, Kozo Okazaki, Hubertus Luetkens, Rustem Khasanov, Zhiwei Wang, Jia-Xin Yin, Zurab Guguchia\",\"doi\":\"10.1038/s42005-025-02235-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Understanding how time-reversal symmetry (TRS) breaks in quantum materials is key to uncovering new states of matter and advancing quantum technologies. However, unraveling the interplay between TRS breaking, charge order, and superconductivity in kagome metals continues to be a compelling challenge. Here, we investigate the kagome metal Cs(V<sub>1-<i>x</i></sub> Nb <sub><i>x</i></sub> )<sub>3</sub>Sb<sub>5</sub> with <i>x</i> = 0.07 using muon spin rotation (<i>μ</i>SR), alternating current (AC) magnetic susceptibility, and scanning tunneling microscopy (STM), under combined tuning by chemical doping, hydrostatic pressure, magnetic field, and depth from the surface. We find that TRS breaking in the bulk emerges below 40 K-lower than the charge order onset at 58 K-while near the surface, TRS breaking onsets at 58 K and is twice as strong. Niobium doping raises the superconducting critical temperature from 2.5 K to 4.4 K. Under pressure, both the critical temperature and superfluid density double, with TRS-breaking superconductivity appearing above 0.85 GPa. 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Pressure induced transition from chiral charge order to time-reversal symmetry-breaking superconducting state in Nb-doped CsV3Sb5.
Understanding how time-reversal symmetry (TRS) breaks in quantum materials is key to uncovering new states of matter and advancing quantum technologies. However, unraveling the interplay between TRS breaking, charge order, and superconductivity in kagome metals continues to be a compelling challenge. Here, we investigate the kagome metal Cs(V1-x Nb x )3Sb5 with x = 0.07 using muon spin rotation (μSR), alternating current (AC) magnetic susceptibility, and scanning tunneling microscopy (STM), under combined tuning by chemical doping, hydrostatic pressure, magnetic field, and depth from the surface. We find that TRS breaking in the bulk emerges below 40 K-lower than the charge order onset at 58 K-while near the surface, TRS breaking onsets at 58 K and is twice as strong. Niobium doping raises the superconducting critical temperature from 2.5 K to 4.4 K. Under pressure, both the critical temperature and superfluid density double, with TRS-breaking superconductivity appearing above 0.85 GPa. These findings reveal a depth-tunable TRS-breaking state and unconventional superconducting behavior in kagome systems.
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.
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