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research article

Signatures of quantum criticality in the thermopower of Ba(Fe1-xCox)(2)As-2

Arsenijevic, S.  
•
Hodovanets, H.
•
Gaal, R.  
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2013
Physical Review B

We demonstrate that the thermopower (S) can be used to probe the spin fluctuations (SFs) in proximity to the quantum critical point (QCP) in Fe-based superconductors. The sensitivity of S to the entropy of charge carriers allows us to observe an increase of S/T in Ba(Fe1-x Co-x)(2)As-2 close to the spin-density-wave (SDW) QCP. This behavior is due to the coupling of low-energy conduction electrons to two-dimensional SFs, similar to heavy-fermion systems. The low-temperature enhancement of S/T in the Co substitution range 0.02 < x < 0.1 is bordered by two Lifshitz transitions, and it corresponds to the superconducting region, where a similarity between the electron and nonreconstructed hole pockets exists. The maximal S/T is observed in proximity to the commensurate-to-incommensurate SDW transition, for critical x(c) approximate to 0.05, close to the highest superconducting T-c. This analysis indicates that low-T thermopower is influenced by critical spin fluctuations which are important for the superconducting mechanism.

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Type
research article
DOI
10.1103/PhysRevB.87.224508
Web of Science ID

WOS:000320609300003

Author(s)
Arsenijevic, S.  
Hodovanets, H.
Gaal, R.  
Forro, L.  
Bud'Ko, S. L.
Canfield, P. C.
Date Issued

2013

Publisher

Amer Physical Soc

Published in
Physical Review B
Volume

87

Issue

22

Article Number

224508

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPCM  
LPMC  
Available on Infoscience
October 1, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/95208
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