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We have successfully prepared the iron-based superconductor K0.8Fe2Se2 crystals (Tc=27 K) and studied the carrier transport properties along the c-axis in detail. Samples are characterized by XRD, SEM and temperature-dependent resistivity. The result shows that there is “phase separation” in the samples. Based on the experimental results, the iron-based superconductor is not a simple two phases alternating along the c-axis, but the metal phases should have weak-link channels along the c-axis, forming a nearly 3D special net mode. Studies of the thermal conductivity and the complex impedance spectrum z(omega, T0) suggest that the superconducting crystals have a lot of grain boundaries along the c-axis direction, the bound polarization charges result in relative dielectric constant of about 106 in magnitude and negative phase characteristics in the vicinity of 10 MHz.
[1] Chen X H 2009 Physics 38 609 (in Chinese) [陈仙辉2009 物理 38 609] Ma T C, Wan Y, Jiang S 2009 Chin. Sci. Bull. 54 557 (in Chinese) [马延灿, 万勇, 姜山 2009 科学通报 54 557]
[2] Stewart G R 2011 Rev. Mod. Phys. 83 1589
[3] Guo J, Jin S, Wang G, Wang S, Zhu K, Zhou T, He M, Chen X 2010 Phys. Rev. B 82 180520
[4] Fang M H, Wang H D, Dong C H, Li Z J, Feng C M, Chen J, Yuan H Q 2011 Europhys. Lett. 94 27009
[5] Yan X W, Gao M, Lu Z Y, Xiang T 2011 Phys. Rev. Lett. 106 087005
[6] Jun Z, Hui B C, Bourret-Courchesne E, Lee D H, and Birgeneau R J 2012 Phys. Rev. Lett. 109 267003
[7] Shermadini Z, Krzton-Maziopa A, Bendele M, Khasanov R, Luetkens H, Conder K, Pomjakushina E, Weyeneth S, Pomjakushin V, Bossen O, Amato A 2011 Phys. Rev. Lett. 106 117602
[8] Wang Z W, Wang Z, Song Y J, Ma C, Cai Y, Chen Z, Tian H F, Yang H X, Chen G F, Li J Q 2012 Phys. Chem. C 116 17847
[9] 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
[10] 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
[11] Wang D H, Dong C H, Li Z J, Feng C M, Chen J, Yuan H Q and Fang M H 2011 Europhys. Lett. 93 47004
[12] Liu Z H, Richard P, Xu N, Xu G, Li Y, Fang X C, Jia L L, Chen G F, Wang D M, He J B, Qian T, Hu J P, Ding H, Wang S C 2012 Phys. Rev. Lett. 109 037003
[13] Wang A F, Yan J 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
[14] Daniel P S, Duck Y C, Helmut C, Melanie C F, Sevda A, Anna L, Mercouri G K 2012 Phys. Rev. B 86 184511
[15] Ma Y C, Liu J W, Lu H W, Zheng H L 2007 J. Phys.: Condens. Matter 19 186203 Ito T, Takagi H, Ishibashi S, Ido T, Uchida S 1991 Nature 350 596
[16] Texier Y, Deisenhofer J, Tsurkan V, Loidl A, Inosov D S, Friemel G, Bobroff J 2013 Phys. Rev. Lett. 108 237002
[17] Mou D X, Liu S Y, Jia X W, He J F, Peng Y Y, Zhao L, Yu L, Liu G D, He S L, Dong X L, Zhang J, Wang H D, Dong C H, Fang M H, Wang X Y, Peng Q J, Wang Z M, Zhang S J, Yang F, Xu Z Y, Chen C T, Zhou X J 2011 Phys. Rev. Lett. 106 107001
[18] Liu Y, Xing Q, Dennis K W, McCallum R W, Lograsso T A 2012 Phys. Rev. B 86 144507
[19] Charnukha A, Cvitkovic A, Prokscha T, Prö pper D, Ocelic N, Suter A, Salman Z, Morenzoni E, Deisenhofer J, Tsurkan V, Loidl A, Keimer B, Boris A V 2012 Phys. Rev. Lett. 109 017003
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[1] Chen X H 2009 Physics 38 609 (in Chinese) [陈仙辉2009 物理 38 609] Ma T C, Wan Y, Jiang S 2009 Chin. Sci. Bull. 54 557 (in Chinese) [马延灿, 万勇, 姜山 2009 科学通报 54 557]
[2] Stewart G R 2011 Rev. Mod. Phys. 83 1589
[3] Guo J, Jin S, Wang G, Wang S, Zhu K, Zhou T, He M, Chen X 2010 Phys. Rev. B 82 180520
[4] Fang M H, Wang H D, Dong C H, Li Z J, Feng C M, Chen J, Yuan H Q 2011 Europhys. Lett. 94 27009
[5] Yan X W, Gao M, Lu Z Y, Xiang T 2011 Phys. Rev. Lett. 106 087005
[6] Jun Z, Hui B C, Bourret-Courchesne E, Lee D H, and Birgeneau R J 2012 Phys. Rev. Lett. 109 267003
[7] Shermadini Z, Krzton-Maziopa A, Bendele M, Khasanov R, Luetkens H, Conder K, Pomjakushina E, Weyeneth S, Pomjakushin V, Bossen O, Amato A 2011 Phys. Rev. Lett. 106 117602
[8] Wang Z W, Wang Z, Song Y J, Ma C, Cai Y, Chen Z, Tian H F, Yang H X, Chen G F, Li J Q 2012 Phys. Chem. C 116 17847
[9] 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
[10] 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
[11] Wang D H, Dong C H, Li Z J, Feng C M, Chen J, Yuan H Q and Fang M H 2011 Europhys. Lett. 93 47004
[12] Liu Z H, Richard P, Xu N, Xu G, Li Y, Fang X C, Jia L L, Chen G F, Wang D M, He J B, Qian T, Hu J P, Ding H, Wang S C 2012 Phys. Rev. Lett. 109 037003
[13] Wang A F, Yan J 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
[14] Daniel P S, Duck Y C, Helmut C, Melanie C F, Sevda A, Anna L, Mercouri G K 2012 Phys. Rev. B 86 184511
[15] Ma Y C, Liu J W, Lu H W, Zheng H L 2007 J. Phys.: Condens. Matter 19 186203 Ito T, Takagi H, Ishibashi S, Ido T, Uchida S 1991 Nature 350 596
[16] Texier Y, Deisenhofer J, Tsurkan V, Loidl A, Inosov D S, Friemel G, Bobroff J 2013 Phys. Rev. Lett. 108 237002
[17] Mou D X, Liu S Y, Jia X W, He J F, Peng Y Y, Zhao L, Yu L, Liu G D, He S L, Dong X L, Zhang J, Wang H D, Dong C H, Fang M H, Wang X Y, Peng Q J, Wang Z M, Zhang S J, Yang F, Xu Z Y, Chen C T, Zhou X J 2011 Phys. Rev. Lett. 106 107001
[18] Liu Y, Xing Q, Dennis K W, McCallum R W, Lograsso T A 2012 Phys. Rev. B 86 144507
[19] Charnukha A, Cvitkovic A, Prokscha T, Prö pper D, Ocelic N, Suter A, Salman Z, Morenzoni E, Deisenhofer J, Tsurkan V, Loidl A, Keimer B, Boris A V 2012 Phys. Rev. Lett. 109 017003
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