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Title: Evidence of a pseudogap driven by competing orders of multi-band origin in the ferromagnetic superconductor Sr0.5Ce0.5FBiS2
Authors: Aslam, Mohammad
Paul, Arpita
Thakur, Gohil S.
Gayen, Sirshendu
Kumar, Ritesh
Singh, Avtar
Das, Shekhar
Ganguli, Ashok K.
Waghmare, Umesh V.
Sheet, Goutam
Keywords: Physics
BiS2 based superconductor
pseudo-gap like structure
PCAR spectroscopy
Issue Date: 2016
Publisher: IoP Publishing Ltd
Citation: Aslam, M.; Paul, A.; Thakur, G. S.; Gayen, S.; Kumar, R.; Singh, A.; Das, S.; Ganguli, A. K.; Waghmare, U. V.; Sheet, G., Evidence of a pseudogap driven by competing orders of multi-band origin in the ferromagnetic superconductor Sr0.5Ce0.5FBiS2. Journal of Physics-Condensed Matter 2016, 28 (19), 6
Journal of Physics-Condensed Matter
Abstract: From temperature and magnetic field dependent point-contact spectroscopy on the ferromagnetic superconductor Sr0.5Ce0.5FBiS2 (bulk superconducting T-c = 2.5 K) we observe (a) a pseudogap in the normal state that sustains to a remarkably high temperature of 40 K and (b) two-fold enhancement of T-c upto 5 K in the point-contact geometry. In addition, Andreev reflection spectroscopy reveals a superconducting gap of 6 meV for certain point-contacts suggesting that the mean field T-c of this system could be approximately 40 K, the onset temperature of pseudo-gap. Our results suggest that quantum fluctuations originating from other competing orders in Sr0.5Ce0.5FBiS2 forbid a global phase coherence at high temperatures thereby suppressing T-c. Apart from the known ordering to a ferromagnetic state, our first-principles calculations reveal nesting of a multi-band Fermi surface and a significant electron-phonon coupling that could result in charge density wave-like instabilities.
Description: Restricted Access
ISSN: 0953-8984
Appears in Collections:Research Articles (Umesh V. Waghmare)

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