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  Influence of disorder on the signature of the pseudogap and multigap superconducting behavior in FeSe

Rößler, S., Huang, C.-L., Jiao, L., Koz, C., Schwarz, U., & Wirth, S. (2018). Influence of disorder on the signature of the pseudogap and multigap superconducting behavior in FeSe. Physical Review B, 97(9): 094503, pp. 1-9. doi:10.1103/PhysRevB.97.094503.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-2326-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-232A-9
Genre: Journal Article

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 Creators:
Rößler, Sahana1, Author              
Huang, Chien-Lung1, Author              
Jiao, Lin1, Author              
Koz, Cevriye2, Author              
Schwarz, Ulrich3, Author              
Wirth, Steffen4, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863423              
4Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863460              

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 Abstract: We investigated several FeSe single crystals grown by two different methods by utilizing experimental techniques, namely, resistivity, magnetoresistance, specific heat, scanning tunneling microscopy, and spectroscopy. The residual resistivity ratio (RRR) shows systematic differences between samples grown by chemical vapor transport and flux vapor transport, indicating variance in the amount of scattering centers. Although the superconducting transition temperature T-c is not directly related to RRR, our study evidences subtle differences in the features of an incipient ordering mode related to a depletion of density of states at the Fermi level. For instance, the onset temperature of anisotropic spin fluctuations at T* approximate to 75 K, and the temperature of the opening up of a partial gap in the density of states at T** approximate to 30 K, are not discernible in the samples with lower RRR. Further, we show that the functional dependence of the electronic specific heat below 2 K, which allows us to determine the nodal features as well as the small superconducting gap, differs significantly in crystals grown by these two different methods. Our investigation suggests that some of the controversies about the driving mechanism for the superconducting gap or its structure and symmetry are related to minute differences in the crystals arising due to the growth techniques used and the total amount of scattering centers present in the sample.

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Language(s): eng - English
 Dates: 2018-03-082018-03-08
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 97 (9) Sequence Number: 094503 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008