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In the frontiers of condensed matter physics, pressure is widely adopted as an independent control parameter for tuning states of matters and plays an important role in finding new phenomena and corresponding physics, as well as in testing the relevant theories. Remarkably, a great deal of success has been achieved in searching for new superconductors and uncovering the microphysics for known superconductors. In this brief review, we attempt to describe the progress in high pressure studies of alkaline selenide superconductors AxFe2-ySe2 (A=K, Rb, Tl/Rb).#br#The high-pressure studies of Tl0.6Rb0.4Fe1.67Se2, K0.8Fe1.7Se2 and K0.8Fe1.78Se2 superconductors show that after the ambient-pressure superconducting phase is completely suppressed under about 9 GPa, the reemergence of a pressure-induced superconductivity with a maximum Tc of 48.7 K is observed at ~11 GPa, which is the highest Tc in this kind of superconductor. The systematic investigations on transport and structural properties for K0.8FeySe2 (y=1.7 and 1.78) reveal that a pressure-induced quantum phase transition occurs at pressure between 9.2 GPa and 10.3 GPa, where the antiferromagnetic state with Fermi liquid behavior converts into the paramagnetic state with non-Fermi liquid behavior. Therefore, it is proposed that the observed reemergence of superconductivity at high pressure is probably driven by the quantum critical transition.#br#In addition, some intriguing puzzles on these superconductors and corresponding possible answers are also reviewed from the perspective of high-pressure studies, including the roles of the insulating magnetic phase in developing/stabilizing ambient-pressure and high-pressure superconducting phases and the significance of the pressure-induced antiferromagnetic fluctuation state for the emergency of superconductivity in the high-pressure superconducting phase.
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Keywords:
- iron selenide superconductors /
- high pressure /
- quantum phase transition /
- antiferromagnetism
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[55] Gu D C, Wu Q, Zhou Y Z, Gao P W, Guo J, Zhang C, Zhang S, Jiang S, Yang K, Li A G, Sun L L, Zhao Z X 2015 New J. Phys. 17 073021
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[1] 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
[2] 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
[3] Fang M H, Wang H D, Dong C H, Li Z J, Feng C M, Chen J, Yuan H Q 2011 EPL 94 27009
[4] Wang H D, Dong C H, Li Z J, Mao Q H, Zhu S S, Feng C M, Yuan H Q, Fang M H 2011 EPL 93 47004
[5] Cao C, Dai J H 2011 Phys. Rev. B 83 193104
[6] Yan X W, Gao M, Lu Z Y, Xiang T 2011 Phys. Rev. B 83 233205
[7] Ricci A, Poccia N, Campi G, Joseph B, Arrighetti G, Barba L, Reynolds M, Burghammer M, Takeya H, Mizuguchi Y, Takano Y, Colapietro M, Saini N L, Bianconi A 2011 Phys. Rev. B 84 060511
[8] Wang Z, Song Y J, Shi H L, Wang Z W, Chen Z, Tian H F, Chen G F, Guo J G, Yang H X, Li J Q 2011 Phys. Rev. B 83 140505
[9] Chen F, Xu M, Ge Q Q, Zhang Y, Ye Z R, Yang L X, Jiang J, Xie B P, Che R C, Zhang M, Wang A F, Chen X H, Shen D W, Hu J P, Feng D L 2011 Phys. Rev. X 1 021020
[10] Wang C N, Marsik P, Schuster R, Dubroka A, Rö ssle M, Niedermayer Ch, Varma G D, Wang A F, Chen X H, Wolf T, Bernhard C 2012 Phys. Rev. B 85 214503
[11] Yuan R. H, Dong T, Song Y J, Zheng P, Chen G F, Hu J P, Li J Q, Wang N L 2012 Sci. Rep. 2 221
[12] Li W, Ding H, Li Z, Deng P, Chang K, He K, Ji S H, Wang L L, Ma X C, Hu J P, Chen X, Xue Q K 2012 Phys. Rev. Lett. 109 057003
[13] Ding X X, Fang D L, Wang Z Y, Yang H, Liu J Z, Deng Q, Ma G B, Meng C, Hu Y H, Wen H H 2013 Nat. Commun. 4 1897
[14] KamiharaY, Watanabe T, Hirano M, Hosono H 2008 J. Am. Chem. Soc. 130 3296
[15] Ren Z A, Lu W, Yang J, Yi W, Shen X L, Li Z C, Che G C, Dong X L, Sun L L, Zhou F, Zhao Z X 2008 Chin. Phys. Lett. 25 2215
[16] Mazin I I 2010 Nature 464 183
[17] Ni N, Thaler A, Yan J Q, Kracher A, Colombier E, Bud'ko S L, Canfield P C 2010 Phys. Rev. B 82 024519
[18] Dai P C, Hu J P, Dagotto E 2012 Nat. Phys. 8 709
[19] Sefat A S 2011 Rep. Prog. Phys. 74 124502
[20] Ye F, Chi S, Bao W, Wang X F, Ying J J, Chen X H, Wang H D, Dong C H, Fang M H 2011 Phys. Rev. Lett. 107 137003
[21] Bao W, Huang Q Z, Chen G F, Green M A, Wang D M, He J B, Qiu Y M 2011 Chin. Phys. Lett. 28 086104
[22] Mazin I I 2011 Physics 4 26
[23] Bao W 2015 J. Phys.: Condens. Matter 27 023201
[24] Bao W 2013 Chin. Phys. B 22 087405
[25] Yuan H Q, Grosche F M, Deppe M, Geibel C, Sparn G, Steglich F 2003 Science 302 2104
[26] Chen X J, Struzhkin V V, Yu Y, Goncharov A F, Lin C T, Mao H K, Hemley R J 2010 Nature 466 950
[27] Uji S, Shinagawa H, Terashima T, Yakabe T, Terai Y, Tokumoto M, Kobayashi A, Tanaka H, Kobayashi H 2001 Nature 410 908
[28] Jin K, Butch N P, Kirshenbaum K, Paglione J, Greene R L 2011 Nature 476 73
[29] Sun LL, 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
[30] Valla T, Fedorov A V, Johnson P D, Wells B O, HulbertS L, Li Q, Gu G D, Koshizuka N 1999 Science 285 2110
[31] van der Marel D, Molegraaf H J A, Zaanen J, Nussinov Z, Carbone F, Damascelli A, Eisaki H, Greven M, Kes P H, Li M 2003 Nature 425 271
[32] Mathur N D, Grosche F M, Julian S R, Walker I R, Freye D M, Haselwimmer R K W, Lonzarich G G 1998 Nature 394 39
[33] Okuhata T, Nagai T, Taniguchi H, Satoh K, Hedo M, Uwatoko Y 2007 J. Phys. Soc. Jpn. 76 188
[34] Nakai Y, Iye T, Kitagawa S, Ishida K, Ikeda H, Kasahara S, Shishido H, Shibauchi T, Matsuda Y, Terashima T 2010 Phys. Rev. Lett. 105 107003
[35] Dai J H, Si Q, Zhu J X, Abrahams E 2009 PNAS 106 4118
[36] 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
[37] Guo J, Chen X J, Dai J H, Zhang C, Guo J G, Chen X L, Wu Q, Gu D C, Gao P W, Yang L H, Yang K, Dai X, Mao H K, Sun L L, Zhao Z X 2012 Phys. Rev. Lett. 108 197001
[38] Ye F, Bao W, Chi S X, Antonio M dos S, Jamie J M, Fang M H, Wang H D, Mao Q H, Wang J C, Liu J J, Sheng J M 2014 Chin. Phys. Lett. 31 127401
[39] Yan Y J, Zhang M, Wang A F, Ying J J, Li Z Y, Qin W, Luo X G, Li J Q, Hu J P, Chen X H 2012 Sci. Rep. 2 212
[40] Gao P W, Yu R, Sun L L, Wang H D, Wang Z, Wu Q, Fang M H, Chen G F, Guo J, Zhang C, Gu D C, Tian H F, Li J Q, Liu J, Li Y C, Li X D, Jiang S, Yang K, Li A G, Si Q, Zhao Z X 2014 Phys. Rev. B 89 094514
[41] Yu R, Si Q 2013 Phys. Rev. Lett. 110 146402
[42] Yi M, Lu D H, Yu R, Riggs S C, Chu J H, Lv B, Liu Z K, Lu M, Cui Y T, Hashimoto M, Mo S K, Hussain Z, Chu C W, Fisher I R, Si Q, Shen Z X 2013 Phys. Rev. Lett. 110 067003
[43] Anisimov V I, Nekrasov I A, Kondakov D E, Rice T M, Sigrist M. 2002 Eur. Phys. J. B 25 191
[44] Neupane M, Richard P, Pan Z H, Xu Y M, Jin R, Mandrus D, Dai X, Fang Z, Wang Z, Ding H 2009 Phys. Rev. Lett. 103 097001
[45] de' Medici L, Hassan S R, Capone M, Dai X 2009 Phys. Rev. Lett. 102 126401
[46] Ying J J, Wang X F, Luo X G, Li Z Y, Yan Y J, Zhang M, Wang A F, Cheng P, Ye G J, Xiang Z J, Liu R H, Chen X H 2011 New J. Phys. 13 033008
[47] Lei H C, Abeykoon M, Bozin E S, Wang K F, Warren J B, Petrovic C 2011 Phys. Rev. Lett. 107 137002
[48] Gu D C, Sun L L, Wu Q, Zhang C, Guo J, Gao P W, Wu Y, Dong X L, Dai X, Zhao Z X 2012 Phys. Rev. B 85 174523
[49] Zhao J, Huang Q, de la Cruz C, Li S L, Lynn J W, Chen Y, Green M A, Chen G F, Li G, Li Z, Luo J L, Wang N L, Dai P C 2008 Nat. Mater. 7 953
[50] Lee C H, Iyo A, Eisaki H, Kito H, Fernandez-Diaz M T, Ito T, Kihou K, Matsuhata H, Braden M, Yamada K 2008 J. Phys. Soc. Jpn. 77 083704
[51] Mizuguchi Y, Hara Y, Deguchi K, Tsuda S, Yamaguchi T, Takeda K, Kotegawa H, Tou H, Takano Y 2010 Supercond. Sci. Technol . 23 054013
[52] Yeh K W, Huang T W, Huang Y L, 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 EPL 84 37002
[53] Mizuguchi Y, Takeya H, Kawasaki Y, Ozaki T, Tsuda S, Yamaguchi T, Takano Y 2011 Appl. Phys. Lett. 98 042511
[54] Liu W P, Li M T, Lin C T 2014 J. Supercond. Nov. Magn. 27 2419
[55] Gu D C, Wu Q, Zhou Y Z, Gao P W, Guo J, Zhang C, Zhang S, Jiang S, Yang K, Li A G, Sun L L, Zhao Z X 2015 New J. Phys. 17 073021
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