| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Unusual Band Splitting and Superconducting Gap Evolution with Sulfur Substitution in FeSe |
| Yuanyuan Yang1, Qisi Wang2, Shaofeng Duan1, Hongliang Wo2, Chaozhi Huang1, Shichong Wang1, Lingxiao Gu1, Dong Qian1, Jun Zhao2,3, and Wentao Zhang1* |
1Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
3Institute of Nanoelectronics and Quantum Computing, Fudan University, Shanghai 200433, China
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| Cite this article: |
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Yuanyuan Yang, Qisi Wang, Shaofeng Duan et al 2022 Chin. Phys. Lett. 39 057302 |
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Abstract High-resolution angle-resolved photoemission measurements were taken on FeSe$_{1-x}$S$_x$ ($x$ = 0, 0.04, and 0.08) superconductors. With an ultrahigh energy resolution of 0.4 meV, unusual two hole bands near the Brillouin-zone center, which was possibly a result of additional symmetry breaking, were identified in all the sulfur-substituted samples. In addition, in both of the hole bands highly anisotropic superconducting gaps with resolution limited nodes were evidenced. We find that the larger superconducting gap on the outer hole band is reduced linearly to the nematic transition temperature while the gap on the inner hole is nearly S-substitution independent. Our observations strongly suggest that the superconducting gap increases with enhanced nematicity although the superconducting transition temperature is not only governed by the pairing strength, demonstrating strong constraints on theories in the FeSe family.
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Received: 18 March 2022
Express Letter
Published: 23 April 2022
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| PACS: |
74.20.Rp
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(Pairing symmetries (other than s-wave))
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.70.Xa
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(Pnictides and chalcogenides)
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| [1] | Lebègue S 2007 Phys. Rev. B 75 035110 |
| [2] | Kreisel A, Hirschfeld P J, and Andersen B M 2020 Symmetry 12 1402 |
| [3] | Fradkin E, Kivelson S A, Lawler M J, Eisenstein J P, and Mackenzie A P 2010 Annu. Rev. Condens. Matter Phys. 1 153 |
| [4] | Nie L, Sun K, Ma W, Song D, Zheng L, Liang Z, Wu P, Yu F, Li J, Shan M, Zhao D, Li S, Kang B, Wu Z, Zhou Y, Liu K, Xiang Z, Ying J, Wang Z, Wu T, and Chen X 2022 Nature 604 59 |
| [5] | Rubio-Verdú C, Turkel S, Song Y, Klebl L, Samajdar R, Scheurer M S, Venderbos J W F, Watanabe K, Taniguchi T, Ochoa H, Xian L, Kennes D M, Fernandes R M, Rubio N, and Pasupathy A N 2022 Nat. Phys. 18 196 |
| [6] | Paglione J and Greene R L 2010 Nat. Phys. 6 645 |
| [7] | Chuang T M, Allan M P, Lee J, Xie Y, Ni N, Bud'ko S L, Boebinger G S, Canfield P C, and Davis J C 2010 Science 327 181 |
| [8] | Bohmer A E, Arai T, Hardy F, Hattori T, Iye T, Wolf T, von Lohneysen H, Ishida K, and Meingast C 2015 Phys. Rev. Lett. 114 027001 |
| [9] | Yi M, Lu D, Chu J H, Analytis J G, Sorini A P, Kemper A F, Moritz B, Mo S K, Moore R G, Hashimoto M, Lee W S, Hussain Z, Devereaux T P, Fisher I R, and Shen Z X 2011 Proc. Natl. Acad. Sci. USA 108 6878 |
| [10] | Fu M, Torchetti D A, Imai T, Ning F L, Yan J Q, and Sefat A S 2012 Phys. Rev. Lett. 109 247001 |
| [11] | Lu X, Park J T, Zhang R, Luo H, Nevidomskyy A H, Si Q, and Dai P 2014 Science 345 657 |
| [12] | Hu J and Xu C 2012 Physica C 481 215 |
| [13] | Si Q, Yu R, and Abrahams E 2016 Nat. Rev. Mater. 1 16017 |
| [14] | Hsu F C, Luo J Y, Yeh K W, Chen T K, Huang T W, Wu P M, Lee Y C, Huang Y L, Chu Y Y, Yan D C, and Wu M K 2008 Proc. Natl. Acad. Sci. USA 105 14262 |
| [15] | McQueen T M, Williams A J, Stephens P W, Tao J, Zhu Y, Ksenofontov V, Casper F, Felser C, and Cava R J 2009 Phys. Rev. Lett. 103 057002 |
| [16] | Bendele M, Amato A, Conder K, Elender M, Keller H, Klauss H H, Luetkens H, Pomjakushina E, Raselli A, and Khasanov R 2010 Phys. Rev. Lett. 104 087003 |
| [17] | Baek S H, Efremov D V, Ok J M, Kim J S, van den Brink J, and Buechner B 2015 Nat. Mater. 14 210 |
| [18] | Coldea A I, Blake S F, Kasahara S, Haghighirad A A, Watson M D, Knafo W, Choi E S, McCollam A, Reiss P, Yamashita T, Bruma M, Speller S C, Matsuda Y, Wolf T, Shibauchi T, and Schofield A J 2019 npj Quantum Mater. 4 2 |
| [19] | Abdel-Hafiez M, Zhang Y Y, Cao Z Y, Duan C G, Karapetrov G, Pudalov V M, Vlasenko V A, Sadakov A V, Knyazev D A, Romanova T A, Chareev D A, Volkova O S, Vasiliev A N, and Chen X J 2015 Phys. Rev. B 91 165109 |
| [20] | Wang L, Hardy F, Wolf T, Adelmann P, Fromknecht R, Schweiss P, and Meingast C 2017 Phys. Status Solidi B 254 1600153 |
| [21] | Watson M D, Kim T K, Haghighirad A A, Blake S F, Davies N R, Hoesch M, Wolf T, and Coldea A I 2015 Phys. Rev. B 92 121108(R) |
| [22] | Reiss P, Watson M D, Kim T K, Haghighirad A A, Woodruff D N, Bruma M, Clarke S J, and Coldea A I 2017 Phys. Rev. B 96 121103(R) |
| [23] | Xu H C, Niu X H, Xu D F, Jiang J, Yao Q, Chen Q Y, Song Q, Abdel-Hafiez M, Chareev D A, Vasiliev A N, Wang Q S, Wo H L, Zhao J, Peng R, and Feng D L 2016 Phys. Rev. Lett. 117 157003 |
| [24] | Tetsuo H, Katsuya I, Yuhki K, Tadashi M, Tatsuya W, Shigeru K, Takasada S, and Yuji M 2018 Sci. Adv. 4 eaar6419 |
| [25] | Li C, Wu X, Wang L, Liu D, Cai Y, Wang Y, Gao Q, Song C, Huang J, Dong C, Liu J, Ai P, Luo H, Yin C H, Liu G, Huang Y, Wang Q, Jia X, Zhang F, Zhang S, Yang F, Wang Z, Peng Q, Xu Z, Shi Y, Hu J, Xiang T, Zhao L, and Zhou X J 2020 Phys. Rev. X 10 031033 |
| [26] | Yang Y Y, Tang T W, Duan S F, Zhou C C, Hao D X, and Zhang W T 2019 Rev. Sci. Instrum. 90 063905 |
| [27] | Wang Q, Shen Y, Pan B, Hao Y, Ma M, Zhou F, Steffens P, Schmalzl K, Forrest T R, Abdel-Hafiez M, Chen X, Chareev D A, Vasiliev A N, Bourges P, Sidis Y, Cao H, and Zhao J 2016 Nat. Mater. 15 159 |
| [28] | Watson M D, Kim T K, Haghighirad A A, Davies N R, McCollam A, Narayanan A, Blake S F, Chen Y L, Ghannadzadeh S, Schofield A J, Hoesch M, Meingast C, Wolf T, and Coldea A I 2015 Phys. Rev. B 91 155106 |
| [29] | Gerber S, Yang S L, Zhu D, Soifer H, Sobota J A, Rebec S, Lee J J, Jia T, Moritz B, Jia C, Gauthier A, Li Y, Leuenberger D, Zhang Y, Chaix L, Li W, Jang H, Lee J S, Yi M, Dakovski G L, Song S, Glownia J M, Nelson S, Kim K W, Chuang Y D, Hussain Z, Moore R G, Devereaux T P, Lee W S, Kirchmann P S, and Shen Z X 2017 Science 357 71 |
| [30] | Sandvik A W, Scalapino D J, and Bickers N E 2004 Phys. Rev. B 69 094523 |
| [31] | Song C L, Wang Y L, Cheng P, Jiang Y P, Li W, Zhang T, Li Z, He K, Wang L L, Jia J F, Hung H H, Wu C J, Ma X C, Chen X, and Xue Q K 2011 Science 332 1410 |
| [32] | Watashige T, Tsutsumi Y, Hanaguri T, Kohsaka Y, Kasahara S, Furusaki A, Sigrist M, Meingast C, Wolf T, Löhneysen H V, Shibauchi T, and Matsuda Y 2015 Phys. Rev. X 5 031022 |
| [33] | Sprau P O, Kostin A, Kreisel A, Böhmer A E, Taufour V, Canfield P C, Mukherjee S, Hirschfeld P J, Andersen B M, and Séamus D J C 2017 Science 357 75 |
| [34] | Liu D, Li C, Huang J, Lei B, Wang L, Wu X, Shen B, Gao Q, Zhang Y, Liu X, Hu Y, Xu Y, Liang A, Liu J, Ai P, Zhao L, He S, Yu L, Liu G, Mao Y, Dong X, Jia X, Zhang F, Zhang S, Yang F, Wang Z, Peng Q, Shi Y, Hu J, Xiang T, Chen X, Xu Z, Chen C, and Zhou X J 2018 Phys. Rev. X 8 031033 |
| [35] | Rhodes L C, Watson M D, Haghighirad A A, Evtushinsky D V, Eschrig M, and Kim T K 2018 Phys. Rev. B 98 180503(R) |
| [36] | Hashimoto T, Ota Y, Yamamoto H Q, Suzuki Y, Shimojima T, Watanabe S, Chen C, Kasahara S, Matsuda Y, Shibauchi T, Okazaki K, and Shin S 2018 Nat. Commun. 9 282 |
| [37] | Kogan V G, Martin C, and Prozorov R 2009 Phys. Rev. B 80 014507 |
| [38] | Kang B L, Shi M Z, Li S J, Wang H H, Zhang Q, Zhao D, Li J, Song D W, Zheng L X, Nie L P, Wu T, and Chen X H 2020 Phys. Rev. Lett. 125 097003 |
| [39] | Miao H, Brito W H, Yin Z P, Zhong R D, Gu G D, Johnson P D, Dean M P M, Choi S, Kotliar G, Ku W, Wang X C, Jin C Q, Wu S F, Qian T, and Ding H 2018 Phys. Rev. B 98 020502(R) |
| [40] | Kreisel A, Andersen B M, Sprau P O, Kostin A, Davis J C S, and Hirschfeld P J 2017 Phys. Rev. B 95 174504 |
| [41] | Benfatto L, Valenzuela B, and Fanfarillo L 2018 npj Quantum Mater. 3 56 |
| [42] | Kreisel A, Andersen B M, and Hirschfeld P J 2018 Phys. Rev. B 98 214518 |
| [43] | Yu R, Zhu J X, and Si Q 2018 Phys. Rev. Lett. 121 227003 |
| [44] | Li J, Lei B, Zhao D, Nie L P, Song D W, Zheng L X, Li S J, Kang B L, Luo X G, Wu T, and Chen X H 2020 Phys. Rev. X 10 011034 |
| [45] | Zhang P, Yaji K, Hashimoto T, Ota Y, Kondo T, Okazaki K, Wang Z, Wen J, Gu G D, Ding H, and Shin S 2018 Science 360 182 |
| [46] | Xing J, Lin H, Li Y, Li S, Zhu X, Yang H, and Wen H H 2016 Phys. Rev. B 93 104520 |
| [47] | Weng K C and Hu C D 2016 Sci. Rep. 6 29919 |
| [48] | Wang Q, Shen Y, Pan B, Zhang X, Ikeuchi K, Iida K, Christianson A D, Walker H C, Adroja D T, Abdel-Hafiez M, Chen X, Chareev D A, Vasiliev A N, and Zhao J 2016 Nat. Commun. 7 12182 |
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