插层FeSe高温超导体的高压研究进展

孙建平; Prashant Shahi; 周花雪; 倪顺利; 王少华; 雷和畅; 王铂森; 董晓莉; 赵忠贤; 程金光

doi:10.7498/aps.67.20181319

摘要

通过对FeSe进行化学插层可以将其超导转变温度（Tc）从约8 K提高到40 K以上，实现高温超导电性.最近，我们对两种插层FeSe高温超导材料（Li0.84Fe0.16）OHFe0.98Se和Li0.36（NH3）yFe2Se2开展了高压调控研究，发现压力会首先抑制高温超导相（称为SC-I相），然后在临界压力Pc以上诱导出第二个高温超导相（称为SC-Ⅱ相），呈现出双拱形T-P超导相图.这两个体系的Pc分别约为5和2 GPa，两个体系SC-Ⅱ相的最高Tc分别可以达到约52和55 K，比相应SC-I相的初始Tc提高了10 K.对（Li0.84Fe0.16）OHFe0.98Se的正常态电输运性质分析表明，SC-I和SC-Ⅱ相的正常态分别具有费米液体和非费米液体行为，意味着这两个超导相可能存在显著差异.此外，还发现这两个体系的SC-Ⅱ相的Tc与霍尔系数倒数1/RH（载流子浓度ne）具有很好的线性依赖关系.对（Li0.84Fe0.16）OHFe0.98Se的高压X射线衍射测量排除了其在10 GPa以内发生结构相变的可能，因此Pc以上SC-Ⅱ相的出现和载流子浓度的增加很可能起源于压力导致的费米面重构.

关键词:

Abstract

Among the iron-based superconductors, the structural simplest FeSe and its derived materials have received much attention in recent years due to the great tunability of the superconducting transition temperature (Tc). The relatively low Tc 8.5 K of FeSe can be raised to over 40 K via the interlayer intercalations such as AxFe2-ySe2 (A=K, Rb, Cs, Tl), Lix(NH3)yFe2Se2, and (Li1-xFex)OHFeSe. Although the monolayer FeSe/SrTiO3 is reported to have a Tc as high as 65 K, none of the Tc values of these FeSe-derived bulk materials has exceeded 50 K at ambient pressure so far. In order to explore other routes to further enhance Tc of FeSe-based materials, we recently performed the detailed high-pressure study of two intercalated FeSe high-Tc superconductors, namely (Li0.84Fe0.16)OHFe0.98Se and Li036(NH3)yFe2Se2, by using a cubic anvil cell apparatus. We find that the applied high pressure first suppresses the superconducting phase (denoted as SC-I) and then induces a second high-Tc superconducting phase (denoted as SC-Ⅱ) above a critical pressure Pc (~5 GPa for (Li0.84Fe0.16)OHFe0.98Se and 2 GPa for Li036(NH3)yFe2Se2). The highest Tc values in the SC-Ⅱ phases of these two compounds can reach~52 K and 55 K, respectively, the latter of which is the highest in the FeSe-based bulk materials, and is very close to the highest Tc of FeAs-based high-Tc superconductors. Our high-precision resistivity data of (Li0.84Fe0.16)OHFe0.98Se also uncover a sharp transition of the normal state from Fermi liquid for SC-I to non-Fermi liquid for SC-Ⅱ phase. In addition, the reemergence of high-Tc SC-Ⅱ phase under pressure is found to be accompanied with a concurrent enhancement of electron carrier density. Interestingly, we find a nearly parallel scaling behavior between Tc and the inverse Hall coefficient for the SC-Ⅱ phases of both (Li0.84Fe0.16)OHFe0.98Se and Li0.36(NH3)yFe2Se2. In the case without structural transition below 10 GPa, the observed enhancement of carrier density in SC-Ⅱ should be ascribed to an electronic origin presumably associated with pressure-induced Fermi surface reconstruction. Our work demonstrates that high pressure offers a distinctive means to further raise the maximum Tc values of intercalated FeSe-based materials.

Keywords:

作者及机构信息

1.
中国科学院物理研究所, 北京凝聚态物理国家研究中心, 北京 100190;

2.
中国科学院大学, 北京 100190;

3.
中国人民大学物理系, 北京光电功能材料和微纳器件重点实验室, 北京 100872

通信作者: 程金光, jgcheng@iphy.ac.cn

基金项目: 国家自然科学基金（批准号：11574377）、国家重点研发计划（批准号：2018YFA0305700，2018YFA0305800）和中国科学院前沿科学重点项目（批准号：QYZDB-SSW-SLH013，QYZDB-SSW-SLH001）资助的课题.

Authors and contacts

1.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

2.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;

3.
Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Department of Physics, Renmin University of China, Beijing 100872, China

Corresponding author: Cheng Jin-Guang, jgcheng@iphy.ac.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11574377), the National Key R D Program of China (Grant Nos. 2018YFA0305700, 2018YFA0305800), and the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant Nos. QYZDB-SSW-SLH013, QYZDB-SSW-SLH001).

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施引文献

[1]	Kamihara Y, Watanabe T, Hirano M, Hosono H 2008 J. Am. Chem. Soc. 130 3296
[2]	Chen X, Dai P, Feng D, Xiang T, Zhang F C 2014 Natl. Sci. Rev. 1 371
[3]	Si Q, Yu R, Abraham E 2016 Nat. Rev. Mater. 1 16017
[4]	Ren Z, Lu W, Yang J, Yi W, Shen X, Li Z, Che G, Dong X, Sun L, Zhou F, Zhao Z 2008 Chin. Phys. Lett. 25 2215
[5]	Mazin I I, Singh D J, Johannes M D, Du M H 2008 Phys. Rev. Lett. 101 057003
[6]	Bohmer A E, Kreisel A 2018 J. Phys.: Condens. Matter 30 023001
[7]	McQueen T M, Williams A J, Stephens P W, Tao J, Zhu Y, Ksenofontov V, Casper F, Felser C, Cava R J 2009 Phys. Rev. Lett. 103 057002
[8]	Shimojima T, Suzuki Y, Snonbe T, Nakamura A, Sakano M, Omachi J, Yoshioka K, Kuwata-Gonokami M, Ono K, Kumigashira H, Bohmer A E, Hardy F, Wolf T, Meingast C, Lohneysen H v, Ikeda H, Ishizaka K 2014 Phys. Rev. B 90 121111
[9]	Nakayama K, Miyata Y, Phan G N, Sato T, Tanabe Y, Urata T, Tanigaki K, Takahashi T 2014 Phys. Rev. Lett. 113 237001
[10]	Fernandes R M, Chubukov A V, Schmalian J 2014 Nat. Phys. 10 97
[11]	Glasbrenner J K, Mazin I I, Jeschke H O, Hirschfeld P J, Fernandes R M, Valenti R 2015 Nat. Phys. 11 953
[12]	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, Wu M K 2008 PNAS 105 14262
[13]	Kasahara S, Watashige T, Hanaguri T, Kohsaka Y, Yamashita T, Shimoyama Y, Mizukami Y, Endo R, Ikeda H, Aoyama K, Terashima T, Uji S, Wolf T, Lohneysen H v, Shibauchi T, Matsuda Y 2014 PNAS 111 16309
[14]	Guo J G, Jin S F, Wang G, Wang S C, Zhu K X, Zhou T T, He M, Chen X L 2010 Phys. Rev. B 82 180520
[15]	Scheidt E W, Hathwar V R, Schmitz D, Dunbar A, Scherer W, Mayr F, Tsurkan V, Deisenhofer J, Loidl A 2012 Eur. Phys. J. B 85 279
[16]	Lu X F, Wang N Z, Wu H, Wu Y P, Zhao D, Zeng X Z, Lou X G, Wu T, Bao W, Zhang G H, Huang F Q, Huang Q Z, Chen X H 2014 Nat. Mater. 14 325
[17]	Lei B, Cui J H, Xiang Z J, Shang C, Wang N Z, Ye G J, Luo X G, Wu T, Sun Z, Chen X H 2016 Phys. Rev. Lett. 116 077002
[18]	Wang Q Y, Li Z, Zhang W H, Zhang Z C, Zhang J S, Li W, Ding H, Ou Y B, Deng P, Chang K, Wen J, Song C L, He K, Jia J F, Ji S H, Wang Y Y, Wang L L, Chen X, Ma X C, Xue Q K 2012 Chin. Phys. Lett. 29 037402
[19]	He S, He J, Zhang W, Zhao L, Liu D, Liu X, Mou D, Ouyang B, Wang Q, Li Z, Wang L, Peng Y, Liu Y, Chen C, Yu L, Liu G, Dong X, Zhang J, Chen C, Xu Z, Chen X, Ma X, Xue Q, Zhou X J 2013 Nat. Mater. 12 605
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[24]	Sun L L, Chen X J, Guo J, Gao P W, Huang Q Z, Wang H D, Fang M H, Chen X L, Chen G F, Wu Q, Zhang C, Gu D C, Dong X L, Wang L, Yang K, Li A G, Dai X, Mao H K, Zhao Z X 2012 Nature 483 67
[25]	Wang C H, Chen T K, Chang C C, Hsu C H, Lee Y C, Wang M J, Wu P M, Wu M K 2015 EPL 111 27004
[26]	Ye F, Bao W, Chi S, dos Santos A M, Molaison J J, Fang M H, Wang H D, Mao Q H, Wang J C, Liu J J, Sheng J M 2014 Chin. Phys. Lett. 31 127401
[27]	Fujita H, Kagayama T, Shimizu K, Yamamoto Y, Mizuki J I, Okazaki H, Takano Y 2015 J. Phys.: Conf. Ser. 592 012070
[28]	Izumi M, Zheng L, Sakai Y, Goto H, Sakata M, Nakamoto Y, Nguyen H L, Kagayama T, Shimizu K, Araki S, Kobayashi T C, Kambe T, Gu D, Guo J, Liu J, Li Y, Sun L, Prassides K, Kubozono Y 2015 Sci. Rep. 5 9477
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[32]	Sun J P, Shahi P, Zhou H X, Huang Y L, Chen K Y, Wang B S, Ni S L, Li N N, Zhang K, Yang W G, Uwatoko Y, Xing G, Sun J, Singh D J, Jin K, Zhou F, Zhang G M, Dong X L, Zhao Z X, Cheng J G 2018 Nat. Commun. 9 380
[33]	Shahi P, Sun J P, Wang S H, Jiao Y Y, Chen K Y, Sun S S, Lei H C, Uwatoko Y, Wang B S, Cheng J G 2017 Phys. Rev. B 97 020508
[34]	Cheng J G, Wang B S, Sun J P, Uwatoko Y 2018 Chin. Phys. B 27 077403
[35]	Dong X, Zhou H, Yang H, Yuan J, Jin K, Zhou F, Yuan D, Wei L, Li J, Wang X, Zhang G, Zhao Z 2015 J. Am. Chem. Soc. 137 66
[36]	Jin K, Butch N P, Kirshenbaum K, Paglione J, Greene R L 2011 Nature 476 73
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[38]	Sun J P, Matsuura K, Ye G Z, Mizukami Y, Shimozawa M, Matsubayashi K, Yamashita M, Watashige T, Kasahara S, Matsuda Y, Yan J Q, Sales B C, Uwatoko Y, Cheng J G, Shibauchi T 2016 Nat. Comm. 7 12146
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[40]	Iimura S, Matsuishi S, Sato H, Hanna T, Muraba Y, Kim S W, Kim J E, Takata M, Hosono H 2012 Nat. Commun. 3 943
[41]	Yang J, Zhou R, Wei L L, Yang H X, Li J Q, Zhao Z X, Zheng G Q 2015 Chin. Phys. Lett. 32 107401
[42]	Das T, Panagopoulos C 2016 New J. Phys. 18 103033
[43]	Yuan H Q, Grosche F M, Deppe M, Geibel C, Sparn G, Steglich F 2003 Science 302 2104
[44]	Das T, Balatsky A V 2013 New J. Phys. 15 093045

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