拓扑超导体FeSexTe1–x单晶超导性能与磁通钉扎

梁超; 张洁; 赵可; 羊新胜; 赵勇

doi:10.7498/aps.69.20201125

摘要

铁基超导体FeSe_xTe_1–_x由于其具有上临界场高、各向异性小、临界电流密度大等优点, 备受研究者的广泛关注. 本文采用自助溶剂法生长得到了几种Se/Te组分比例不同的FeSe_xTe_1–_x单晶样品, 对其结构和形貌进行了表征, 并且对样品在低温下的磁性进行了测量. 对样品超导态下临界电流密度、磁通钉扎力和磁场的关系进行了分析, 讨论了样品在低温下的磁通钉扎模式. 通过分析Se和Te的不同比例对上述性能的影响, 确定了超导性能最佳的组分, 为今后进一步研究FeSe_xTe_1–_x的超导与拓扑性质提供了参考.

关键词:

Abstract

Iron-based superconductor FeSe_xTe_1–_x has attracted attention because of its high upper critical field, low anisotropy, and high critical current density. Also, it is predicted to have nontrivial topological properties, so that it is a candidate of realizing Majorana fermion, when the superconductivity is combined with topological features. However, its flux pinning behavior and mechanism in superconducting state with varying Se/Te ratio have not been systematically studied . We use self-flux method to grow single crystal samples of FeSe_xTe_1–_x with different x values (0.3, 0.4, 0.5 and 0.6). The structural and morphological properties of the monocrystalline samples are characterized by XRD and SEM. All samples show that they possess the expected crystalline structures and their lattice parameters vary with x value. The magnetic properties at low temperatures are also measured, showing that all samples have good superconductivity. Superconducting properties, such as critical current densities and flux pinning force densities, are extracted from the magnetic measurements and analyzed, and the flux pinning behavior is discussed. The best Se:Te ratio is determined to be nearly 0.4/0.6 based on the comparison among these properties of different samples. By utilizing the Dew-Hughes theory and analyzing the pinning force density peak, the flux pinning mechanism in the best samples (x = 0.4, 0.5) can be regarded as the mixture of normal point pinning and Δκ volume pinning. This work provides important information for the further study of the topological and superconducting properties of FeSe_xTe_1–_x.

Keywords:

作者及机构信息

1.
西南交通大学物理科学与技术学院, 成都　610031

2.
西南交通大学超导与新能源研究开发中心, 成都　610031

通信作者: 赵可, zhaoke@swjtu.edu.cn

基金项目: 国家自然科学基金(批准号: 51271155, 51377138, 51877180)、国家重点研发计划(批准号: 2017YFE0301402)、国家高技术研究发展计划(批准号: 2014AA032701)和四川应用基础研究项目(批准号: 2018JY0003)资助的课题

Authors and contacts

1.
School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China

2.
Superconductivity and New Energy R & D Center, Southwest Jiaotong University, Chengdu 610031, China

Corresponding author: Zhao Ke, zhaoke@swjtu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 51271155, 51377138, 51877180), the National Key R&D Program of China (Grant No. 2017YFE0301402), the National High Technology Research and Development Program of China (Grant No. 2014AA032701), and the Sichuan Applied Basic Research Project, China (Grant No. 2018JY0003)

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参考文献

[1]	Kamihara Y, Hiramatsu H, Hirano M, Kawamura R, Yanagi H, Kamiya T, Hosono H 2006 J. Am. Chem. Soc. 128 10012 Google Scholar
[2]	Kamihara Y, Watanabe T, Hirano M, Hosono H 2008 J. Am. Chem. Soc. 130 3296 Google Scholar
[3]	Xu G X, Huang H, Zhang X P, Huang S Y, Ma Y M 2018 Acta. Phys. Sin-Ch. Ed. 20 67
[4]	Wu Z F, Wang Z H, T ao J, Qiu L, Yang S G, Wen H H 2016 Supercond. Sci. Technol. 29 035006 Google Scholar
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[9]	Sun Y, Tsuchiyab Y, Yamadab T, Taenb T, Pyonb S, Shia Z X, Tamegai T 2014 Physica C 113 8656
[10]	Abe H, Noji T, Kato M, Koike Y 2010 Physica C 980 8579
[11]	Rößler S, Cherian D, Harikrishnan S, Bhat H L, Elizabeth S, Mydosh J A, Tjeng L H, Steglich F, Wirth S 2010 Phys. Rev. B 82 144523 Google Scholar
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[15]	Wu Z F, Wang Z H, Tao J, Qiu L, Yang S G, Wen H H 2016 Supercond. Sci. Technol. 29 4
[16]	Leo A, Guarino A, Grimaldi G, Nigro A, Pace S, Bellingeri E, Giannini E 2014 J. Phys.: Conf. Ser. 507 012029 Google Scholar
[17]	Wu Z, Tao J, Xu X, Qiu L, Yang S, Wang Z 2016 Physica C 528 39 Google Scholar
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[19]	Gomez K W 2010 J. Nov. Magn. 23 551 Google Scholar
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[21]	Wang A F, Ying J J, Yan Y J, Liu R H, Luo X G, Li Z Y, Wang X F, Zhang M, Ye G J, Cheng P, Xiang Z J, Chen X H 2011 Phys. Rev. B 83 060512 Google Scholar
[22]	Yeh K W, Huang T W, Huang Y I, Chen T K, Hsu F C, Wu P M, Lee Y C, Chu Y Y, Chen C L, Luo J Y, Yan D C, Wu M K 2008 Europhys. Lett. 84 37002 Google Scholar
[23]	Bean C P 1994 Rev. Mod. Phys. 36 31
[24]	Kumar R, Sudesh, Varma G D 2018 Aip. Adv. 8 055819 Google Scholar
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施引文献

图 1 (a) FeSe_xTe_1–_x 单晶样品X射线衍射图谱; (b) (001)随组分比例x的变化; (c)晶格参数c随x的变化

Fig. 1. (a) X-ray diffraction pattern of FeSe_xTe_1–_x single crystal sample; (b) the (001) peak shifts with changing x; (c) lattice parameter c changes with Se content x.

下载: 全尺寸图片幻灯片

图 2 FeSe_xTe_1–_x 样品的SEM图谱　(a) x = 0.3; (b) x = 0.4; (c) x = 0.5; (d) x = 0.6, 其中(b)图右上角为同一样品的另一个区域

Fig. 2. SEM images of FeSe_xTe_1–_x samples: (a) x = 0.3; (b) x = 0.4; (c) x = 0.5; (d) x = 0.6. The upper right corner of Fig. (b) is another region of the same sample.

下载: 全尺寸图片幻灯片

图 3 FeSe_xTe_1–_x(x = 0.3, 0.4, 0.5, 0.6)样品的磁化强度-温度(ZFC, FC)曲线

Fig. 3. M-T (ZFC, FC) curves of FeSe_xTe_1–_x (x = 0.3, 0.4, 0.5, 0.6) samples.

下载: 全尺寸图片幻灯片

图 4 FeSe_xTe_1–_x样品在磁场平行于样品c轴时不同温度下的磁滞回线　(a) x = 0.3; (b) x = 0.4; (c) x = 0.5; (d) x = 0.6

Fig. 4. Hysteresis loops of FeSe_xTe_1–x samples at different temperatures under the field parallel to c axis: (a) x = 0.3; (b) x = 0.4; (c) x = 0.5; (d) x = 0.6.

下载: 全尺寸图片幻灯片

图 5 (a), (b)不同Se含量的FeSe_xTe_1–_x样品的J_c- H曲线　(a) T = 2 K, (b) T = 4 K; (c), (d) 不同Se含量的FeSe_xTe_1-_x样品归一化的钉扎力密度和约化磁场的关系 (c)T = 2 K, (d)T = 4 K

Fig. 5. J_c- H curves of FeSe_xTe_1–_x samples with different Se contents: (a) T = 2 K, (b) T = 4 K; F_p/F_p^max - normalized field curves: (c) T = 2 K, (d) T = 4 K.

下载: 全尺寸图片幻灯片

表 1 F_p-h曲线的Dew-Hughes公式拟合参数值

Table 1. Fitted parameters of F_p curves.

T = 2 K T = 4 K
p q F_p峰位 p q F_p峰位

x = 0.4 1.647 2.461 0.4013 1.996 2.233 0.4654
x = 0.5 1.632 2.870 0.3552 2.001 2.335 0.4398

下载: 导出CSV

[1]	Kamihara Y, Hiramatsu H, Hirano M, Kawamura R, Yanagi H, Kamiya T, Hosono H 2006 J. Am. Chem. Soc. 128 10012 Google Scholar
[2]	Kamihara Y, Watanabe T, Hirano M, Hosono H 2008 J. Am. Chem. Soc. 130 3296 Google Scholar
[3]	Xu G X, Huang H, Zhang X P, Huang S Y, Ma Y M 2018 Acta. Phys. Sin-Ch. Ed. 20 67
[4]	Wu Z F, Wang Z H, T ao J, Qiu L, Yang S G, Wen H H 2016 Supercond. Sci. Technol. 29 035006 Google Scholar
[5]	Tapp J H, Tang Z, Lv B, et al. 2008 Phys. Rev. B 78 060505 Google Scholar
[6]	Yuan F, Iida K, Grinenko V, Chekhonin P, Pukenas A, Skrotzki W, Sakoda M, Naio M, Sala A, Putti M, Yamashita A, Takano Y, Shi Z, Nielsch K, Hiihne R 2017 Aip. Adv. 7 065015 Google Scholar
[7]	Bao W, Qiu Y, Huang Q, Green Q M, Zajdel P, Fitzsimmons M R, Zhernenkov M, Chang S, Fang M, Qian Q, Vehstedt E Q, Yang J, Pham H M, Spinu L, Mao Z Q 2009 Phys. Rev. Lett. 102 247001 Google Scholar
[8]	Fiamozzi Zignani C, De Marzi G, Corato V, Mancini V, Vannozzi A, Rufoloni A, Leo1 V, Guarino A, Galluzzi A, Nigro A, Polichetti M, della Corte A, Pace S, Grimaldi G 2018 J. Mater. Sci. 132 84084
[9]	Sun Y, Tsuchiyab Y, Yamadab T, Taenb T, Pyonb S, Shia Z X, Tamegai T 2014 Physica C 113 8656
[10]	Abe H, Noji T, Kato M, Koike Y 2010 Physica C 980 8579
[11]	Rößler S, Cherian D, Harikrishnan S, Bhat H L, Elizabeth S, Mydosh J A, Tjeng L H, Steglich F, Wirth S 2010 Phys. Rev. B 82 144523 Google Scholar
[12]	Yadav C S, Paulose P L 2009 New J. Phys. 11 103046 Google Scholar
[13]	Cieplaka M Z, Bezusyya V L 2015 Philos. Mag. 1478 6435
[14]	Migita M, Takikawa Y, Takeda M, Uehara M, Kuramoto T, Takano Y, Kimishima Y 2011 Physica C 471 916 Google Scholar
[15]	Wu Z F, Wang Z H, Tao J, Qiu L, Yang S G, Wen H H 2016 Supercond. Sci. Technol. 29 4
[16]	Leo A, Guarino A, Grimaldi G, Nigro A, Pace S, Bellingeri E, Giannini E 2014 J. Phys.: Conf. Ser. 507 012029 Google Scholar
[17]	Wu Z, Tao J, Xu X, Qiu L, Yang S, Wang Z 2016 Physica C 528 39 Google Scholar
[18]	Zhuang J C, Yeoh W K, Cui X Y, Xu X, Du Y, Shi Z X, Ringer P S, Wang X I, Dou S X 2014 Sci. Rep.-Uk. 4 7273
[19]	Gomez K W 2010 J. Nov. Magn. 23 551 Google Scholar
[20]	Imai Y, Sawada Y, Nabeshima F, Maeda A 2015 Proc. Natl. Acad. Sci. 122 193
[21]	Wang A F, Ying J J, Yan Y J, Liu R H, Luo X G, Li Z Y, Wang X F, Zhang M, Ye G J, Cheng P, Xiang Z J, Chen X H 2011 Phys. Rev. B 83 060512 Google Scholar
[22]	Yeh K W, Huang T W, Huang Y I, Chen T K, Hsu F C, Wu P M, Lee Y C, Chu Y Y, Chen C L, Luo J Y, Yan D C, Wu M K 2008 Europhys. Lett. 84 37002 Google Scholar
[23]	Bean C P 1994 Rev. Mod. Phys. 36 31
[24]	Kumar R, Sudesh, Varma G D 2018 Aip. Adv. 8 055819 Google Scholar
[25]	Bonura M, Giannini E, Viennois R, Senatore C 2012 Phys. Rev. B 85 134532 Google Scholar
[26]	Shen B, Cheng P, Wang Z S, Fang L, Ren C, Shan L, Gu C Z, Wen H H 2010 Phys. Rev. B 81 014503 Google Scholar
[27]	Galluzzi A, Buchkov K, Nazarova E, Tomov V, Grimaldi G, Leo A, Pace A, Polichetti M 2018 J. Appl. Phys. 123 233904 Google Scholar

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拓扑超导体FeSe_xTe_1–_x单晶超导性能与磁通钉扎