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Since the high-Tc superconductivity in iron-based superconductors was found in 2008, numerous new iron-based superconductors have been discovered. Of them, FeSe-based superconductors receive the most attention due to their unique properties. Here, we briefly introduce the structure and physical properties of two newly found FeSe-based superconductors, i.e. (Li, Fe) OHFeSe and (CTA)x FeSe. The former is synthesized by the hydrothermal method, while the latter is synthesized by electrochemical intercalation method. Moreover, we also introduce the tuning of electronic properties of FeSe by electric-double-layer and solid-ion-conductor based transistors.
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Keywords:
- unconventional superconductors /
- iron-based superconductors /
- FeSe-based superconductors /
- gate-voltage tuning
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[1] Onnes H K 1911 Commun. Phys. Lab. Univ. Leiden. 120b, 122b, 124c
[2] Bednorz J G, Mller K A 1986 Zeitschriftfr Phys. B: Condens. Matter 64 189
[3] Kamihara Y, Watanabe T, Hirano M, et al. 2008 J. Am. Chem. Soc. 130 3296
[4] Chen X H, Wu T, Wu G, et al. 2008 Nature 453 761
[5] Chen G F, Li Z, Wu D, et al. 2008 Phys. Rev. Lett. 100 247002
[6] Ren Z A, Yang J, Lu W, et al. 2008 Europhys. Lett. 82 57002
[7] Ren Z A, Che G C, Dong X L, et al. 2008 Europhys. Lett. 83 17002
[8] Ren Z A, Lu W, Yang J, et al. 2008 Chin. Phys. Lett. 25 2215
[9] Cruz C, Huang Q, Lynn J W, et al. 2008 Nature 453 899
[10] Liu R H, Wu G, Wu T, et al. 2008 Phys. Rev. Lett. 101 087001
[11] Hsu F C, Luo J Y, Yeh K W, et al. 2008 Proc. Natl. Acad. Sci. USA 105 14262
[12] Guo J G, Jin S, Wang G, et al. 2010 Phys. Rev. B 82 180520
[13] Maziopa A, Shermadini Z, Pomjakushina E, et al. 2011 J. Phys: Condens. Matter 23 052203
[14] Wang A F, Ying J J, Yan Y J, et al. 2011 Phys. Rev. B 83 060512
[15] Fang M H, Wang H D, Dong C H, et al. 2011 Europhys. Lett. 94 27009
[16] Ye F, Chi S, Bao W, et al. 2011 Phys. Rev. Lett. 107 137003
[17] Ying T P, Chen X L, Wang G, et al. 2012 Sci. Rep. 2 426
[18] Wang Q Y, Li Z, Zhang W H, et al. 2012 Chin. Phys. Lett. 29 037402
[19] Lu X F, Wang N Z, Wu H, et al. 2015 Nature Mater. 14 325
[20] Lu X F, Wang N Z, Zhang G H, et al. 2013 Phys. Rev. B 89 020507
[21] Lu X F, Wang N Z, Luo X G, et al. 2014 Phys. Rev. B 90 214520
[22] Dong X, Jin K, Yuan D, et al. 2015 Phys. Rev. B 92 064515
[23] Niu X H, Peng R, Xu H C, et al. 2015 Phys. Rev. B 92 060504
[24] Zhao L, Liang A, Yuan D, et al. 2016 Nat. Commun. 7 10608
[25] Hatakeda T, Noji T, Kawamata T, et al. 2013 J. Phys. Soc. Jpn. 82 123705
[26] Hosono S, Noji T, Hatakeda T, et al. 2014 J. Phys. Soc. Jpn. 83 113704
[27] Wei D, Liang J, Zhu Y, et al. 2014 Electrochem. Commun. 38 124
[28] Shi M Z, Wang N Z, Lei B, et al. 2018 Phys. Rev. Mater. 2 074801
[29] Lei B, Cui J H, Xiang Z J, et al. 2016 Phys. Rev. Lett. 116 077002
[30] Lei B, Wang N Z, Shang C, et al. 2017 Phys. Rev. B 95 020503
[31] Lee J, Schmitt F, Moore R, et al. 2014 Nature 515 245
[32] Yang S, Sobota J A, Leuenberger D, et al. 2015 Nano Lett. 15 4150
[33] Xiang Y Y, Wang F, Wang D, et al. 2012 Phys. Rev. B 86 134508
[34] Coh S, Lee D H, Louie S G, et al. 2016 Phys. Rev. B 93 245138
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