| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
|
|
|
|
Anisotropic s-Wave Gap in the Vicinity of a Quantum Critical Point in Superconducting BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_2$ Single Crystals: A Study of Point-Contact Spectroscopy |
| Hong-Xing Zhan1, Yu-Chi Lin1, Yu-Qing Zhao1, Hai-Yan Zuo1, Xing-Yu Wang2, Xiao-Yan Ma2, Chun-Hong Li2, Hui-Qian Luo2, Gen-Fu Chen2, Shi-Liang Li2*, and Cong Ren1,3* |
1School of Physics and Astronomy, Yunnan University, Kunming 650500, China
2Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3Yunnan Key Laboratory for Electromagnetic Materials and Devices, Yunnan University, Kunming 650500, China
|
|
| Cite this article: |
|
Hong-Xing Zhan, Yu-Chi Lin, Yu-Qing Zhao et al 2024 Chin. Phys. Lett. 41 047402 |
|
|
|
|
Abstract We report on soft $c$-axis point-contact Andreev reflection (PCAR) spectroscopy combining with resistivity measurements on BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$, to elucidate the superconducting gap structure in the vicinity of the quantum critical point. A double peak at the gap edge plus a dip feature at zero-bias has been observed on the PCAR spectra, indicative of the presence of a nodeless gap in BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$. Detailed analysis within a sophisticated theoretical model reveals an anisotropic gap with deep gap minima. The PCARs also feature additional structures related to the electron–bosonic coupling mode. Using the extracted superconducting energy gap value, a characteristic bosonic energy $\varOmega_{\rm b}$ and its temperature dependence are obtained, comparable with the spin-resonance energy observed in neutron scattering experiment. These results indicate a magnetism-driven quantum critical point in the BaFe$_2$(As$_{1-x}$P$_x$)$_2$ system.
|
|
|
Received: 15 January 2024
Published: 16 April 2024
|
|
| PACS: |
74.40.Kb
|
(Quantum critical phenomena)
|
| |
74.70.Xa
|
(Pnictides and chalcogenides)
|
| |
74.45.+c
|
(Proximity effects; Andreev reflection; SN and SNS junctions)
|
|
|
|
|
|
| [1] | Johnston D C 2010 Adv. Phys. 59 803 |
| [2] | Stewart G R 2011 Rev. Mod. Phys. 83 1589 |
| [3] | Hirschfeld P J, Korshunov M M, and Mazin I I 2011 Rep. Prog. Phys. 74 124508 |
| [4] | Chubukov A 2012 Annu. Rev. Condens. Matter Phys. 3 57 |
| [5] | Mazin I I, Singh D J, Johannes M D, and Du M H 2008 Phys. Rev. Lett. 101 057003 |
| [6] | Boeri L, Dolgov O V, and Golubov A A 2008 Phys. Rev. Lett. 101 026403 |
| [7] | Kuroki K, Onari S, Arita R, Usui H, Tanaka Y, Kontani H, and Aoki H 2008 Phys. Rev. Lett. 101 087004 Erratum: 2009 Phys. Rev. Lett. 102 109902 |
| [8] | Wang F, Zhai H, Ran Y, Vishwanath A, and Lee D H 2009 Phys. Rev. Lett. 102 047005 |
| [9] | Maier T A, Graser S, Scalapino D J, and Hirschfeld P J 2009 Phys. Rev. B 79 224510 |
| [10] | Graser S, Kemper A F, Maier T A, Cheng H P, Hirschfeld P J, and Scalapino D J 2010 Phys. Rev. B 81 214503 |
| [11] | Nakaoka H, Yamakawa Y, and Kontani H 2018 Phys. Rev. B 98 125107 |
| [12] | Shimojima T, Ishizaka K, Ishida Y, Katayama N, Ohgushi K, Kiss T, Okawa M, Togashi T, Wang X Y, Chen C T, Watanabe S, Kadota R, Oguchi T, Chainani A, and Shin S 2010 Phys. Rev. Lett. 104 057002 |
| [13] | Kontani H and Onari S 2010 Phys. Rev. Lett. 104 157001 |
| [14] | Saito T, Onari S, and Kontani H 2010 Phys. Rev. B 82 144510 |
| [15] | Zhang J, Sknepnek R, Fernandes R M, and Schmalian J 2009 Phys. Rev. B 79 220502 |
| [16] | Fletcher J D, Serafin A, Malone L, Analytis J G, Chu J H, Erickson A S, Fisher I R, and Carrington A 2009 Phys. Rev. Lett. 102 147001 |
| [17] | Okazaki K, Ota Y, Kotani Y, Malaeb W, Ishida Y, Shimojima T, Kiss T, Watanabe S, Chen C T, Kihou K, Lee C H, Iyo A, Eisaki H, Saito T, Fukazawa H, Kohori Y, Hashimoto K, Shibauchi T, Matsuda Y, Ikeda H, Miyahara H, Arita R, Chainani A, and Shin S 2012 Science 337 1314 |
| [18] | Gonnelli R S, Daghero D, Tortello M, Ummarino G A, Bukowski Z, Karpinski J, Reuvekamp P G, Kremer R K, Profeta G, Suzuki K, and Kuroki K 2016 Sci. Rep. 6 26394 |
| [19] | Hashimoto K, Yamashita M, Kasahara S, Senshu Y, Nakata N, Tonegawa S, Ikada K, Serafin A, Carrington A, Terashima T, Ikeda H, Shibauchi T, and Matsuda Y 2010 Phys. Rev. B 81 220501 |
| [20] | Zhang Y, Ye Z R, Ge Q Q, Chen F, Jiang J, Xu M, Xie B P, and Feng D L 2012 Nat. Phys. 8 371 |
| [21] | Hashimoto K, Cho K, Shibauchi T, Kasahara S, Mizukami Y, Katsumata R, Tsuruhara Y, Terashima T, Ikeda H, Tanatar M A, Kitano H, Salovich N, Giannetta R W, Walmsley P, Carrington A, Prozorov R, and Matsuda Y 2012 Science 336 1554 |
| [22] | Shibauchi T, Carrington A, and Matsuda Y 2014 Annu. Rev. Condens. Matter Phys. 5 113 |
| [23] | Huang H X, Li W, Gao Y, Chen Y, and Zhang F C 2019 Phys. Rev. B 100 144501 |
| [24] | Nakai Y, Iye T, Kitagawa S, Ishida K, Kasahara S, Shibauchi T, Matsuda Y, and Terashima T 2010 Phys. Rev. B 81 020503 |
| [25] | Yamashita M, Senshu Y, Shibauchi T, Kasahara S, Hashimoto K, Watanabe D, Ikeda H, Terashima T, Vekhter I, Vorontsov A B, and Matsuda Y 2011 Phys. Rev. B 84 060507 |
| [26] | Yoshida T, Ideta S, Shimojima T, Malaeb W, Shinada K, Suzuki H, Nishi I, Fujimori A, Ishizaka K, Shin S, Nakashima Y, Anzai H, Arita M, Ino A, Namatame H, Taniguchi M, Kumigashira H, Ono K, Kasahara S, Shibauchi T, Terashima T, Matsuda Y, Nakajima M, Uchida S, Tomioka Y, Ito T, Kihou K, Lee C H, Iyo A, Eisaki H, Ikeda H, Arita R, Saito T, Onari S, and Kontani H 2014 Sci. Rep. 4 7292 |
| [27] | Diao Z, Campanini D, Fang L, Kwok W K, Welp U, and Rydh A 2016 Phys. Rev. B 93 014509 |
| [28] | Daghero D, Tortello M, Ummarino G A, Piatti E, Ghigo G, Hatano T, Kawaguchi T, Ikuta H, and Gonnelli R S 2018 Supercond. Sci. Technol. 31 034005 |
| [29] | Wang Y, Kreisel A, Hirschfeld P J, and Mishra V 2013 Phys. Rev. B 87 094504 |
| [30] | Mizukami Y, Konczykowski M, Kawamoto Y, Kurata S, Kasahara S, Hashimoto K, Mishra V, Kreisel A, Wang Y, Hirschfeld P J, Matsuda Y, and Shibauchi T 2014 Nat. Commun. 5 5657 |
| [31] | Mizukami Y, Konczykowski M, Matsuura K, Watashige T, Kasahara S, Matsuda Y, and Shibauchi T 2017 J. Phys. Soc. Jpn. 86 083706 |
| [32] | Daghero D, Tortello M, Ummarino G A, and Gonnelli R S 2011 Rep. Prog. Phys. 74 124509 |
| [33] | Nakajima M, Uchida S I, Kihou K, Lee C H, Iyo A, and Eisaki H 2012 J. Phys. Soc. Jpn. 81 104710 |
| [34] | Gonnelli R S, Daghero D, Ummarino G A, Stepanov V A, Jun J, Kazakov S M, and Karpinski J 2002 Phys. Rev. Lett. 89 247004 |
| [35] | Ye Z R, Zhang Y, Chen F, Xu M, Ge Q Q, Jiang J, Xie B P, and Feng D L 2012 Phys. Rev. B 86 035136 |
| [36] | Analytis J G, Kuo H H, McDonald R D, Wartenbe M, Rourke P M C, Hussey N E, and Fisher I R 2014 Nat. Phys. 10 194 |
| [37] | Howlader S and Sheet G 2021 J. Phys.: Condens. Matter 33 403002 |
| [38] | Shan L, Huang Y, Wang Y L, Li S L, Zhao J, Dai P C, Zhang Y Z, Ren C, and Wen H H 2008 Phys. Rev. B 77 014526 |
| [39] | Park W K, Sarrao J L, Thompson J D, and Greene L H 2008 Phys. Rev. Lett. 100 177001 |
| [40] | Grinenko V, Iida K, Kurth F, Efremov D V, Drechsler S L, Cherniavskii I, Morozov I, Hänisch J, Föster T, Tarantini C, Jaroszynski J, Maiorov B, Jaime M, Yamamoto A, Nakamura I, Fujimoto R, Hatano T, Ikuta H, and Hühne R 2017 Sci. Rep. 7 4589 |
| [41] | Blonder G E, Tinkham M, and Klapwijk T M 1982 Phys. Rev. B 25 4515 |
| [42] | Tanaka Y and Kashiwaya S 1995 Phys. Rev. Lett. 74 3451 |
| [43] | Dynes R C, Narayanamurti V, and Garno J P 1978 Phys. Rev. Lett. 41 1509 |
| [44] | Pogrebna A, Mertelj T, Ye Z R, Feng D L, and Mihailovic D 2015 Phys. Rev. B 92 144503 |
| [45] | Hu D, Zhang W L, Wei Y, Roessli B, Skoulatos M, Regnault L P, Chen G F, Song Y, Luo H Q, Li S L, and Dai P C 2017 Phys. Rev. B 96 180503 |
| [46] | Ishikado M, Nagai Y, Kodama K, Kajimoto R, Nakamura M, Inamura Y, Wakimoto S, Nakamura H, Machida M, Suzuki K, Usui H, Kuroki K, Iyo A, Eisaki H, Arai M, and Shamoto S 2011 Phys. Rev. B 84 144517 |
| [47] | Shan L, Gong J, Wang Y L, Shen B, Hou X Y, Ren C, Li C H, Yang H, Wen H H, Li S L, and Dai P C 2012 Phys. Rev. Lett. 108 227002 |
| [48] | Tortello M, Daghero D, Ummarino G A, Stepanov V A, Jiang J, Weiss J D, Hellstrom E E, and Gonnelli R S 2010 Phys. Rev. Lett. 105 237002 |
| [49] | Wang Z S, Wang Z Y, Luo H Q, Lu X Y, Zhu J, Li C H, Shan L, Yang H, Wen H H, and Ren C 2012 Phys. Rev. B 86 060508 |
| [50] | Hong W S, Song L X, Liu B, Li Z Z, Zeng Z Y, Li Y, Wu D S, Sui Q T, Xie T, Danilkin S, Ghosh H, Ghosh A, Hu J P, Zhao L, Zhou X J, Qiu X G, Li S L, and Luo H Q 2020 Phys. Rev. Lett. 125 117002 |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
