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The 112-type (Ca, RE)FeAs2 (RE=rare earth) superconductors are very special among the iron-based superconductors for their particular crystal structures with arsenic chain configuration and attractive electronic phase diagram with the coexistence of superconductivity and antiferromagnetism upon carrier doping, while the chemical phases are absent for the low doping level or undoped parent compound. Here we report the single crystal growth method and physical characterizations for the newly discovered Eu 112 type parent compound EuFeAs2. The single crystal of EuFeAs2 is grown by high temperature solution method through using CsCl as the flux under the constant temperature of 800℃ with the molar ratio of the starting materials Eu:Fe:As:CsCl=1:1:4:18. The as-grown crystal is shinyplatelike piece with a typical size of 1 mm1 mm0.2 mm, and quite stable in air. The chemical composition of EuFeAs2 crystal is confirmed by energy-dispersive X-ray spectroscopy. The single crystal X-ray diffraction analysis at room temperature indicates that EuFeAs2 crystallizes into an orthorhombic crystal structure with the space group Imm2 (No. 44), and the refined lattice parameters are a=21.285(9) , b=3.9082(10) , c=3.9752(9) , which are different from those of the Ca 112 compound, but similar to those of unique zigzag As-As chain configuration presented in the layered crystal structure. Electrical resistivity measurements show three anomalies near 110 K, 98 K, and 46 K. The former two anomalies with relatively high temperature imply that the structural and antiferromagnetic transitions are related to Fe2+ sublattice, which is similar to other iron-based parent compounds. The low temperature anomaly at 46 K is attributed to the antiferromagnetic transition of Eu2+ sublattice, which is also confirmed by the corresponding transition observed in the direct current magnetic susceptibility measurement. The magnetic susceptibility of EuFeAs2 exhibits obvious anisotropy blow 46 K when the magnetic field is parallel or perpendicular to the bc plane, while the exact orientation of the Eu2+ moment needs further studying. The discovery of EuFeAs2 provides a new platform for further studying the unique crystal structure and electronic state phase diagrams in the 112-type iron-based superconducting family, and may shed new light on the correlations between superconductivity and magnetism.
[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] Chen H, Ren Y, Qiu Y, Bao W, Liu R H, Wu G, Wu T, Xie Y L, Wang X F, Huang Q, Chen X H 2009 EPL 85 17006
[4] Luetkens H, Klauss H H, Kraken M, Litterst F J, Dellmann T, Klingeler R, Hess C, Khasanov R, Amato A, Baines C, Kosmala M, Schumann O J, Braden M, Hamann-Borrero J, Leps N, Kondrat A, Behr G, Werner J, Buchner B 2009 Nat. Mater. 8 305
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[6] Yakita H, Ogino H, Okada T, Yamamoto A, Kishio K, Tohei T, Ikuhara Y, Gotoh Y, Fujihisa H, Kataoka K, Eisaki H, Shimoyama J 2014 J. Am. Chem. Soc. 136 846
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[8] Li M Y, Liu Z T, Zhou W, Yang H F, Shen D W, Li W, Jiang J, Niu X H, Xie B P, Sun Y, Fan C C, Yao Q, Liu J S, Shi Z X, Xie X M 2015 Phys. Rev. B 91 045112
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[14] Matsubayashi K, Munakata K, Isobe M, Katayama N, Ohgushi K, Ueda Y, Kawamura N, Mizumaki M, Ishimatsu N, Hedo M, Umehara I, Uwatoko Y 2011 Phys. Rev. B 84 024502
[15] Jiang S, Liu C, Cao H B, Birol T, Allred J M, Tian W, Liu L, Cho K, Krogstad M J, Ma J, Taddei K M, Tanatar M A, Hoesch M, Prozorov R, Rosenkranz S, Uemura Y J, Kotliar G, Ni N 2016 Phys. Rev. B 93 054522
[16] Koo J, Park J, Kook Cho S, Duk Kim K, Park S Y, Hee Jeong Y, Jun Park Y, Yeong Koo T, Hong K P, Lee C H, Kim J Y, Cho B K, Bong Lee K, Kim H J 2010 J. Phys. Soc. Jpn. 79 114708
[17] Ren Z, Zhu Z, Jiang S, Xu X, Tao Q, Wang C, Feng C, Cao G, Xu Z A 2008 Phys. Rev. B 78 052501
[18] Feng C, Ren Z, Xu S, Jiang S, Xu Z A, Cao G, Nowik I, Felner I, Matsubayashi K, Uwatoko Y 2010 Phys. Rev. B 82 094426
[19] Ballinger J, Wenger L E, Vohra Y K, Sefat A S 2012 J. Appl. Phys. 111 07E106
[20] Sengupta K, Alzamora M, Fontes M B, Sampathkumaran E V, Ramos S M, Hering E N, Saitovitch E M B, Paulose P L, Ranganathan R, Doert T, Jemetio J P F 2012 J. Phys. Condens. Matter 24 096004
[21] Guguchia Z, Bosma S, Weyeneth S, Shengelaya A, Puzniak R, Bukowski Z, Karpinski J, Keller H 2011 Phys. Rev. B 84 144506
[22] Xiao Y, Su Y, Meven M, Mittal R, Kumar C M N, Chatterji T, Price S, Persson J, Kumar N, Dhar S K, Thamizhavel A, Brueckel T 2009 Phys. Rev. B 80 174424
[23] McGuire M A, Christianson A D, Sefat A S, Sales B C, Lumsden M D, Jin R, Payzant E A, Mandrus D, Luan Y, Keppens V, Varadarajan V, Brill J W, Hermann R P, Sougrati M T, Grandjean F, Long G J 2008 Phys. Rev. B 78 094517
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[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] Chen H, Ren Y, Qiu Y, Bao W, Liu R H, Wu G, Wu T, Xie Y L, Wang X F, Huang Q, Chen X H 2009 EPL 85 17006
[4] Luetkens H, Klauss H H, Kraken M, Litterst F J, Dellmann T, Klingeler R, Hess C, Khasanov R, Amato A, Baines C, Kosmala M, Schumann O J, Braden M, Hamann-Borrero J, Leps N, Kondrat A, Behr G, Werner J, Buchner B 2009 Nat. Mater. 8 305
[5] Zhao J, Huang Q, de la Cruz C, Li S, Lynn J W, Chen Y, Green M A, Chen G F, Li G, Li Z, Luo J L, Wang N L, Dai P 2008 Nat. Mater. 7 953
[6] Yakita H, Ogino H, Okada T, Yamamoto A, Kishio K, Tohei T, Ikuhara Y, Gotoh Y, Fujihisa H, Kataoka K, Eisaki H, Shimoyama J 2014 J. Am. Chem. Soc. 136 846
[7] Kawasaki S, Mabuchi T, Maeda S, Adachi T, Mizukami T, Kudo K, Nohara M, Zheng G Q 2015 Phys. Rev. B 92 180508
[8] Li M Y, Liu Z T, Zhou W, Yang H F, Shen D W, Li W, Jiang J, Niu X H, Xie B P, Sun Y, Fan C C, Yao Q, Liu J S, Shi Z X, Xie X M 2015 Phys. Rev. B 91 045112
[9] Rutzinger D, Bartsch C, Doerr M, Rosner H, Neu V, Doert T, Ruck M 2010 J. Solid State Chem. 183 510
[10] Ni N, Allred J M, Chan B C, Cava R J 2011 Proc. Natl. Acad. Sci. U. S. A. 108 E1019
[11] Yu J, Liu T, Pan B J, Ruan B B, Wang X C, Mu Q G, Zhao K, Chen G F, Ren Z A 2017 Sci. Bull. 62 218
[12] Yakita H, Ogino H, Sala A, Okada T, Yamamoto A, Kishio K, Iyo A, Eisaki H, Shimoyama J 2015 Physica C 518 14
[13] Sun L, Guo J, Chen G, Chen X, Dong X, Lu W, Zhang C, Jiang Z, Zou Y, Zhang S, Huang Y, Wu Q, Dai X, Li Y, Liu J, Zhao Z 2010 Phys. Rev. B 82 134509
[14] Matsubayashi K, Munakata K, Isobe M, Katayama N, Ohgushi K, Ueda Y, Kawamura N, Mizumaki M, Ishimatsu N, Hedo M, Umehara I, Uwatoko Y 2011 Phys. Rev. B 84 024502
[15] Jiang S, Liu C, Cao H B, Birol T, Allred J M, Tian W, Liu L, Cho K, Krogstad M J, Ma J, Taddei K M, Tanatar M A, Hoesch M, Prozorov R, Rosenkranz S, Uemura Y J, Kotliar G, Ni N 2016 Phys. Rev. B 93 054522
[16] Koo J, Park J, Kook Cho S, Duk Kim K, Park S Y, Hee Jeong Y, Jun Park Y, Yeong Koo T, Hong K P, Lee C H, Kim J Y, Cho B K, Bong Lee K, Kim H J 2010 J. Phys. Soc. Jpn. 79 114708
[17] Ren Z, Zhu Z, Jiang S, Xu X, Tao Q, Wang C, Feng C, Cao G, Xu Z A 2008 Phys. Rev. B 78 052501
[18] Feng C, Ren Z, Xu S, Jiang S, Xu Z A, Cao G, Nowik I, Felner I, Matsubayashi K, Uwatoko Y 2010 Phys. Rev. B 82 094426
[19] Ballinger J, Wenger L E, Vohra Y K, Sefat A S 2012 J. Appl. Phys. 111 07E106
[20] Sengupta K, Alzamora M, Fontes M B, Sampathkumaran E V, Ramos S M, Hering E N, Saitovitch E M B, Paulose P L, Ranganathan R, Doert T, Jemetio J P F 2012 J. Phys. Condens. Matter 24 096004
[21] Guguchia Z, Bosma S, Weyeneth S, Shengelaya A, Puzniak R, Bukowski Z, Karpinski J, Keller H 2011 Phys. Rev. B 84 144506
[22] Xiao Y, Su Y, Meven M, Mittal R, Kumar C M N, Chatterji T, Price S, Persson J, Kumar N, Dhar S K, Thamizhavel A, Brueckel T 2009 Phys. Rev. B 80 174424
[23] McGuire M A, Christianson A D, Sefat A S, Sales B C, Lumsden M D, Jin R, Payzant E A, Mandrus D, Luan Y, Keppens V, Varadarajan V, Brill J W, Hermann R P, Sougrati M T, Grandjean F, Long G J 2008 Phys. Rev. B 78 094517
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