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Superconducting gap of quasi-one-dimensional Cr-based superconductor RbCr3As3

Li Qing Wang Min-Xiang Liu Tong Mu Qing-Ge Ren Zhi-An Li Shi-Yan

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Superconducting gap of quasi-one-dimensional Cr-based superconductor RbCr3As3

Li Qing, Wang Min-Xiang, Liu Tong, Mu Qing-Ge, Ren Zhi-An, Li Shi-Yan
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  • Since the discovery of high-temperature superconductivity in cuprates, finding more unconventional superconductors and understanding their superconducting pairing mechanism has been an important theme in condensed matter physics. Recently, ternary Cr-based superconductors A2Cr3As3 (A=K, Rb, Cs) and ACr3As3 (A=K, Rb) were reported, which own quasi-one-dimensional crystal structure, containing[(Cr3As3)-] linear chains. A2Cr3As3 belongs to P6m2 space group, and ACr3As3 crystallizes in a centrosymmetric structure with the space group P63/m. Many experiments, such as nuclear magnetic resonance, London penetration depth, show that A2Cr3As3 is an unconventional superconductor. However, these A2Cr3As3 compounds are extremely unstable in air. Here, we study the superconducting gap of the air-stable RbCr3As3 single crystal, using ultralow-temperature thermal conductivity measurement. The resistivity of RbCr3As3 single crystal shows a superconducting transition temperature Tczero at 6.6 K. The normal-state resistivity data from 20 K to 8 K are fitted to (T)=0 + AT2, which gives a residual resistivity of 0=781 cm. Then, the thermal conductivity of RbCr3As3 single crystal is measured at temperature down to 80 mK and in magnetic fields up to 9 T. In zero field, residual linear term 0/T=7.5 WK-2cm-1 is observed, which is about 24% of its normal-state value, suggesting nodes in the superconducting gap. At low field, the 0/T of RbCr3As3 shows a relatively faster field dependence than single-gap s-wave superconductors. These results reveal that RbCr3As3 is likely an unconventional superconductor with superconducting gap nodes, although the exact superconducting gap symmetry and structure for this quasi-one-dimensional superconductor needs further investigation.
      Corresponding author: Li Shi-Yan, shiyan_li@fudan.edu.cn
    • Funds: Project supported by the National Key Research and Development Plan of China (Grant Nos. 2016YFA0300503, 2015CB921401), the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Grant No. U1630248), and the National Natural Science Foundation of China (Grant Nos. 11474339, 11774402).
    [1]

    Norman M R 2011 Science 322 196

    [2]

    Voit J 1994 Rep. Prog. Phys. 57 977

    [3]

    Grner G 1988 Rev. Mod. Phys. 60 1129

    [4]

    Lee I J, Brown S E, Clark W G, Strouse M J, Naughton M J, Kang W, Chaikin P M 2001 Phys. Rev. Lett. 88 017004

    [5]

    Sepper O, Lebed A G 2013 Phys. Rev. B 87 100511

    [6]

    Bao J K, Liu J Y, Ma C W, Meng Z H, Tang Z T, Sun Y L, Zhai H F, Jiang H, Bai H, Feng C M, Xu Z A, Cao G H 2015 Phys. Rev. X 5 011013

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    Tang Z T, Bao J K, Liu Y, Sun Y L, Ablimit A, Zhai H F, Jiang H, Feng C M, Xu Z A, Cao G H 2015 Phys. Rev. B 91 020506

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    Tang Z T, Bao J K, Wang Z, Bai H, Jiang H, Liu Y, Zhai H F, Feng C M, Xu Z A, Cao G H 2015 Sci. China: Mater. 58 16

    [9]

    Zhou Y, Cao C, Zhang F C 2017 Sci. Bull. 62 208

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    Jiang H, Cao G H, Cao C 2015 Sci. Rep. 5 16054

    [11]

    Zhi H Z, Imai T, Ning F L, Bao J K, Cao G H 2015 Phys. Rev. Lett. 114 147004

    [12]

    Tang Z T, Bao J K,Liu Y, Bai H, Jiang H, Zhai H F, Feng C M, Xu Z A, Cao G H 2015 Sci. China: Mater. 58 543

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    Bao J K, Li L, Tang Z T, Liu Y, Li Y K, Bai H, Feng C M, Xu Z A, Cao G H 2015 Phys. Rev. B 91 180404

    [14]

    Mu Q G, Ruan B B, Pan B J, Liu T, Yu J, Zhao K, Chen G F, Ren Z A 2017 Phys. Rev. B 96 140504

    [15]

    Liu T, Mu Q G, Pan B J, Yu J, Ruan B B, Zhao K, Chen G F, Ren Z A 2017 Europhys. Lett. 120 27006

    [16]

    Shakeripour H, Petrovic C, Taillefer L 2009 New J. Phys. 11 055065

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    Sutherland M, Hawthorn D G, Hill R W, Ronning F, Wakimoto S, Zhang H, Proust C, Boaknin E, Lupien C, Taillefer L, Liang R X, Bonn D A, Hardy W N, Gagnon R, Hussey N E, Kimura T, Nohara M, Takagi H 2003 Phys. Rev. B 67 174520

    [18]

    Li S Y, Bonnemaison J B, Payeur A, Fournier P, Wang C H, Chen X H, Taillefer L 2008 Phys. Rev. B 77 134501

    [19]

    Dong J K, Zhou S Y, Guan T Y, Zhang H, Dai Y F, Qiu X, Wang X F, He Y, Chen X H, Li S Y 2010 Phys. Rev. Lett. 104 087005

    [20]

    Proust C, Boaknin E, Hill R W, Taillefer L, Mackenzie A P 2002 Phys. Rev. Lett. 89 147003

    [21]

    Suzuki M, Tanatar M A, Kikugawa N, Mao Z Q, Maeno Y, Ishiguro T 2002 Phys. Rev. Lett. 88 227004

    [22]

    Lowell J, Sousa J B 1970 J. Low. Temp. Phys. 3 65

    [23]

    Willis J, Ginsberg D 1976 Phys. Rev. B 14 1916

    [24]

    Boaknin E, Tanatar M A, Paglione J, Hawthorn D, Ronning F, Hill R W, Sutherland M, Taillefer L, Sonier J, Hayden S M, Brill J W 2003 Phys. Rev. Lett. 90 117003

    [25]

    Reid J P, Tanatar M A, Fecteau A J, Gordon R T, de Cotret S R, Leyraud N D, Saito T, Fukazawa H, Kohori Y, Kihou K, Lee C H, Iyo A, Eisaki H, Prozorov R, Taillefer L 2012 Phys. Rev. Lett. 109 087001

    [26]

    Lee I J, Chow D S, Clark W G, Strouse M J, Naughton M J, Chaikin P M, Brown S E 2003 Phys. Rev. B 68 092510

    [27]

    Belin S, Behnia K 1997 Phys. Rev. Lett. 79 2125

    [28]

    Luke G M, Rovers M T, Fukaya A, Gat I M, Larkin I,Savici A, Uemura Y J, Kojima K M, Chaikin P M, Lee I J, Naughton M J 2003 Physica B 326 378

    [29]

    Yonezawa S, MaenoY, Bechgaard K, Jrome D 2012 Phys. Rev. B 85 140520

    [30]

    Shimahara H 2000 Phys. Rev. B 61 R14936

    [31]

    Kuroki K, Arita R, Aoki H 2001 Phys. Rev. B 63 094509

    [32]

    Lebed A G 2012 Physica B 407 1803

  • [1]

    Norman M R 2011 Science 322 196

    [2]

    Voit J 1994 Rep. Prog. Phys. 57 977

    [3]

    Grner G 1988 Rev. Mod. Phys. 60 1129

    [4]

    Lee I J, Brown S E, Clark W G, Strouse M J, Naughton M J, Kang W, Chaikin P M 2001 Phys. Rev. Lett. 88 017004

    [5]

    Sepper O, Lebed A G 2013 Phys. Rev. B 87 100511

    [6]

    Bao J K, Liu J Y, Ma C W, Meng Z H, Tang Z T, Sun Y L, Zhai H F, Jiang H, Bai H, Feng C M, Xu Z A, Cao G H 2015 Phys. Rev. X 5 011013

    [7]

    Tang Z T, Bao J K, Liu Y, Sun Y L, Ablimit A, Zhai H F, Jiang H, Feng C M, Xu Z A, Cao G H 2015 Phys. Rev. B 91 020506

    [8]

    Tang Z T, Bao J K, Wang Z, Bai H, Jiang H, Liu Y, Zhai H F, Feng C M, Xu Z A, Cao G H 2015 Sci. China: Mater. 58 16

    [9]

    Zhou Y, Cao C, Zhang F C 2017 Sci. Bull. 62 208

    [10]

    Jiang H, Cao G H, Cao C 2015 Sci. Rep. 5 16054

    [11]

    Zhi H Z, Imai T, Ning F L, Bao J K, Cao G H 2015 Phys. Rev. Lett. 114 147004

    [12]

    Tang Z T, Bao J K,Liu Y, Bai H, Jiang H, Zhai H F, Feng C M, Xu Z A, Cao G H 2015 Sci. China: Mater. 58 543

    [13]

    Bao J K, Li L, Tang Z T, Liu Y, Li Y K, Bai H, Feng C M, Xu Z A, Cao G H 2015 Phys. Rev. B 91 180404

    [14]

    Mu Q G, Ruan B B, Pan B J, Liu T, Yu J, Zhao K, Chen G F, Ren Z A 2017 Phys. Rev. B 96 140504

    [15]

    Liu T, Mu Q G, Pan B J, Yu J, Ruan B B, Zhao K, Chen G F, Ren Z A 2017 Europhys. Lett. 120 27006

    [16]

    Shakeripour H, Petrovic C, Taillefer L 2009 New J. Phys. 11 055065

    [17]

    Sutherland M, Hawthorn D G, Hill R W, Ronning F, Wakimoto S, Zhang H, Proust C, Boaknin E, Lupien C, Taillefer L, Liang R X, Bonn D A, Hardy W N, Gagnon R, Hussey N E, Kimura T, Nohara M, Takagi H 2003 Phys. Rev. B 67 174520

    [18]

    Li S Y, Bonnemaison J B, Payeur A, Fournier P, Wang C H, Chen X H, Taillefer L 2008 Phys. Rev. B 77 134501

    [19]

    Dong J K, Zhou S Y, Guan T Y, Zhang H, Dai Y F, Qiu X, Wang X F, He Y, Chen X H, Li S Y 2010 Phys. Rev. Lett. 104 087005

    [20]

    Proust C, Boaknin E, Hill R W, Taillefer L, Mackenzie A P 2002 Phys. Rev. Lett. 89 147003

    [21]

    Suzuki M, Tanatar M A, Kikugawa N, Mao Z Q, Maeno Y, Ishiguro T 2002 Phys. Rev. Lett. 88 227004

    [22]

    Lowell J, Sousa J B 1970 J. Low. Temp. Phys. 3 65

    [23]

    Willis J, Ginsberg D 1976 Phys. Rev. B 14 1916

    [24]

    Boaknin E, Tanatar M A, Paglione J, Hawthorn D, Ronning F, Hill R W, Sutherland M, Taillefer L, Sonier J, Hayden S M, Brill J W 2003 Phys. Rev. Lett. 90 117003

    [25]

    Reid J P, Tanatar M A, Fecteau A J, Gordon R T, de Cotret S R, Leyraud N D, Saito T, Fukazawa H, Kohori Y, Kihou K, Lee C H, Iyo A, Eisaki H, Prozorov R, Taillefer L 2012 Phys. Rev. Lett. 109 087001

    [26]

    Lee I J, Chow D S, Clark W G, Strouse M J, Naughton M J, Chaikin P M, Brown S E 2003 Phys. Rev. B 68 092510

    [27]

    Belin S, Behnia K 1997 Phys. Rev. Lett. 79 2125

    [28]

    Luke G M, Rovers M T, Fukaya A, Gat I M, Larkin I,Savici A, Uemura Y J, Kojima K M, Chaikin P M, Lee I J, Naughton M J 2003 Physica B 326 378

    [29]

    Yonezawa S, MaenoY, Bechgaard K, Jrome D 2012 Phys. Rev. B 85 140520

    [30]

    Shimahara H 2000 Phys. Rev. B 61 R14936

    [31]

    Kuroki K, Arita R, Aoki H 2001 Phys. Rev. B 63 094509

    [32]

    Lebed A G 2012 Physica B 407 1803

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Publishing process
  • Received Date:  11 September 2018
  • Accepted Date:  08 October 2018
  • Published Online:  20 October 2019

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