Tc=21 K in epitaxial FeSe0.5Te0.5 thin films with biaxial compressive strain

被引：185

作者：

Bellingeri, E. ^{[1
]}

Pallecchi, I. ^{[1
]}

Buzio, R. ^{[1
]}

Gerbi, A. ^{[1
]}

Marre, D. ^{[1
,2
]}

Cimberle, M. R. ^{[3
]}

Tropeano, M. ^{[1
,2
]}

Putti, M. ^{[1
,2
]}

Palenzona, A. ^{[1
,4
]}

Ferdeghini, C. ^{[1
]}

机构：

[1] CNR SPIN, I-16152 Genoa, Italy

[2] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[3] CNR IMEM, I-16146 Genoa, Italy

[4] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 10期

关键词：

STRESS;

D O I：

10.1063/1.3358148

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Epitaxial FeSe0.5Te0.5 thin films with different thickness were grown by pulsed laser ablation deposition on different substrates. High purity phase and fully epitaxial growth were obtained. By varying the film thickness, superconducting transition temperatures up to 21 K were observed, significantly larger than the bulk value 16.2 K. Structural analyses indicated that the c-axis is smaller than the bulk value but it is almost independent of the film thickness and the a-axis changes significantly with the film thickness and is linearly related to the T-c. The latter result indicates the important role of the compressive strain in enhancing T-c. T-c is also related to both the Fe-(Se,Te) bond length and angle, suggesting the possibility of further enhancement. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3358148]

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共 21 条

[11] THE INTRINSIC STRESS OF POLYCRYSTALLINE AND EPITAXIAL THIN METAL-FILMS [J].

KOCH, R .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1994, 6 (45) :9519-9550

[12]

KUMARY TG, 2001, ARXIV09041502V1, P24301

[13] Effect of structural parameters on superconductivity in fluorine-free LnFeAsO1-y (Ln = La, Nd) [J].

Lee, Chul-Ho ;

Iyo, Akira ;

Eisaki, Hiroshi ;

Kito, Hijiri ;

Fernandez-Diaz, Maria Teresa ;

Ito, Toshimitsu ;

Kihou, Kunihiro ;

Matsuhata, Hirofumi ;

Braden, Markus ;

Yamada, Kazuyoshi .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2008, 77 (08)

[14]

MEDVEDEV S, ARXIV09032143V1

[15] Enhancement of the superconducting transition temperature of MgB2 by a strain-induced bond-stretching mode softening -: art. no. 147006 [J].

Pogrebnyakov, AV ;

Redwing, JM ;

Raghavan, S ;

Vaithyanathan, V ;

Schlom, DG ;

Xu, SY ;

Li, Q ;

Tenne, DA ;

Soukiassian, A ;

Xi, XX ;

Johannes, MD ;

Kasinathan, D ;

Pickett, WE ;

Wu, JS ;

Spence, JCH .

PHYSICAL REVIEW LETTERS, 2004, 93 (14) :147006-1

[16] Enhanced superconducting transition temperature in FeSe0.5Te0.5 thin films [J].

Si, Weidong ;

Lin, Zhi-Wei ;

Jie, Qing ;

Yin, Wei-Guo ;

Zhou, Juan ;

Gu, Genda ;

Johnson, P. D. ;

Li, Qiang .

APPLIED PHYSICS LETTERS, 2009, 95 (05)

[17] Superconductivity at 43 K in an iron-based layered compound LaO1-xFxFeAs [J].

Takahashi, Hiroki ;

Igawa, Kazumi ;

Arii, Kazunobu ;

Kamihara, Yoichi ;

Hirano, Masahiro ;

Hosono, Hideo .

NATURE, 2008, 453 (7193) :376-378

[18] LiFeAs:: An intrinsic FeAs-based superconductor with Tc=18 K [J].

Tapp, Joshua H. ;

Tang, Zhongjia ;

Lv, Bing ;

Sasmal, Kalyan ;

Lorenz, Berrid ;

Chu, Paul C. W. ;

Guloy, Arnold M. .

PHYSICAL REVIEW B, 2008, 78 (06)

[19] Pressure induced superconductivity in CaFe2As2 [J].

Torikachvili, Milton S. ;

Bud'ko, Sergey L. ;

Ni, Ni ;

Canfield, Paul C. .

PHYSICAL REVIEW LETTERS, 2008, 101 (05)

[20] Effect of chemical pressure on spin density wave and superconductivity in undoped and 15% F-doped La1-yYyFeAsO compounds [J].

Tropeano, M. ;

Fanciulli, C. ;

Canepa, F. ;

Cimberle, M. R. ;

Ferdeghini, C. ;

Lamura, G. ;

Martinelli, A. ;

Putti, M. ;

Vignolo, M. ;

Palenzona, A. .

PHYSICAL REVIEW B, 2009, 79 (17)