Observation of lateral long range order in superconducting FeTe thin films

doi:10.1088/1674-1056/19/8/087403

Abstract We find that the superconductivity in the thin films of the formerly believed non-superconducting parent compound FeTe is accompanied by an emergence of second order with a correlation length of 742 nm and 258 nm at 10 K and 300 K, respectively. The structural phase transition found in iron pnictide superconductors, in non-superconducting FeTe bulk samples, and in FeSe superconducting thin films is not observed in the superconducting FeTe thin films. The interplay between superconductivity and long range order may suggest the crucial role of competition between electronic localization and itinerancy which leads to strong quantum fluctuations in the FeTe system.

Keywords: superconducting materials surface phase transitions and critical phenomena superconducting films x-ray determination of structures

Received: 12 May 2010
Revised: 19 May 2010
Accepted manuscript online:

PACS:	74.78.-w	(Superconducting films and low-dimensional structures)
	64.70.K-
	74.25.Jb	(Electronic structure (photoemission, etc.))
	74.40.+k

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2006CB921107 and 2010CB630704) and the National Natural Science Foundation of China (Grant No. 10774165).

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Li Wei-Yong (李位勇), Han Ye (韩烨), Wang Huan-Hua (王焕华), Cao Li-Xin (曹立新), Jia Quan-Jie (贾全杰), Chen Yu (陈雨), Jiang Xiao-Ming (姜晓明), Dong Cheng (董成), Xu Bo (许波), Zhao Bai-Ru (赵柏儒) Observation of lateral long range order in superconducting FeTe thin films 2010 Chin. Phys. B 19 087403

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