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Title: Filamentary superconductivity across the phase diagram of Ba(Fe,Co)2As2
Authors: Hu, Tao
Panagopoulos, Christos
Xiao, H.
He, S. K.
Shen, B.
Zhang, W. J.
Xu, B.
He, K. F.
Han, J.
Singh, Y. P.
Wen, H. H.
Qiu, X. G.
Almasan, C. C.
Keywords: DRNTU::Science::Chemistry::Physical chemistry::Magnetochemistry
Issue Date: 2012
Source: Xiao, H., Hu, T., He, S. K., Shen, B., Zhang, W. J., Xu, B., et al. (2012). Filamentary superconductivity across the phase diagram of Ba(Fe,Co)2As2. Physical Review B, 86(6), 064521-.
Series/Report no.: Physical review B
Abstract: We show magnetotransport results on Ba(Fe1−xCox)2As2 (0.0⩽x⩽0.13) single crystals. We identify the low-temperature resistance step at 23 K in the parent compound with the onset of filamentary superconductivity (FLSC), which is suppressed by an applied magnetic field in a similar manner to the suppression of bulk superconductivity (SC) in doped samples. FLSC is found to persist across the phase diagram until the long-range antiferromagnetic order is completely suppressed. A significant suppression of FLSC occurs for 0.02<x<0.04, the doping concentration where bulk SC emerges. Based on these results and the recent report of an electronic anisotropy maximum for 0.02 ⩽x⩽ 0.04 [ Chu et al. Science 329 824 (2010)], we speculate that, besides spin fluctuations, orbital fluctuations may also play an important role in the emergence of SC in iron-based superconductors.
DOI: 10.1103/PhysRevB.86.064521
Rights: © 2012 American Physical Society. This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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