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Title: Anomalous scaling of Δ C versus T c in the Fe-based superconductors: the $${S}_{\pm }$$-wave pairing state model

Journal Article · · New Journal of Physics
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The strong power law behavior of the specific heat jump $${\rm{\Delta }}C\;$$ versus T c $$({\rm{\Delta }}C/{T}_{{\rm{c}}}\sim {T}_{{\rm{c}}}^{\alpha },\alpha \approx 2)$$, first observed by Bud'ko et al (2009 Phys. Rev. B 79 220516), has been confirmed with several families of the Fe-based superconducting compounds with various dopings. We tested a minimal two band BCS model to understand this anomalous behavior and showed that this non-BCS relation between $${\rm{\Delta }}C\;$$ versus T c is a generic property of the multiband superconducting state paired by a dominant interband interaction ($${V}_{\mathrm{inter}}\gt {V}_{\mathrm{intra}}$$) reflecting the relation $$\frac{{{\rm{\Delta }}}_{{\rm{h}}}}{{{\rm{\Delta }}}_{{\rm{e}}}}\sim \sqrt{\frac{{N}_{{\rm{e}}}}{{N}_{{\rm{h}}}}}$$ near T c, as in the $${S}_{\pm }$$-wave pairing state. We also found that this $${\rm{\Delta }}C\;$$ versus T c power law can continuously change from the ideal BNC scaling to a considerable deviation by a moderate variation of the impurity scattering rate $${{\rm{\Gamma }}}_{0}$$ (non-pair-breaking). Finally, as a result, our model provides a consistent explanation why the electron-doped Fe-based superconductors follow the ideal BNC scaling very well while the hole-doped systems often show varying degree of deviations.

Research Organization:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-86ER45268; 2013-R1A1A2-057535
OSTI ID:
1236522
Alternate ID(s):
OSTI ID: 1236523; OSTI ID: 1254478
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Vol. 18 Journal Issue: 2; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

References (36)

Effect of spin-density wave fluctuations on the specific heat jump in iron pnictides at the superconducting transition journal April 2014
Doping-dependent specific heat study of the superconducting gap in Ba ( Fe 1 − x Co x ) 2 As 2 journal May 2010
Superconducting specific-heat jump Δ C el ∝ T c β ( β ≈ 2 ) for K 1 − x Na x Fe 2 As 2 journal February 2014
Doping evolution of superconducting gaps and electronic densities of states in Ba(Fe 1−x Co x ) 2 As 2 iron pnictides journal August 2010
Heat capacity jump at T c and pressure derivatives of superconducting transition temperature in the Ba 1 − x K x Fe 2 As 2 ( 0.2 ≤ x ≤ 1.0 ) series journal March 2013
Selective Mott Physics as a Key to Iron Superconductors journal April 2014
Multigap superconductivity in single crystals of Ba 0.65 Na 0.35 Fe 2 As 2 : A calorimetric investigation journal August 2011
Pair breaking in iron pnictides journal December 2009
Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 − x F x journal July 2008
Power-law-like correlation between condensation energy and superconducting transition temperatures in iron pnictide/chalcogenide superconductors: Beyond the BCS understanding journal April 2014
Properties of Superconducting Alloys Containing Paramagnetic Impurities journal December 1964
Jump in specific heat at the superconducting transition temperature in Ba ( Fe 1 − x Co x ) 2 As 2 and Ba ( Fe 1 − x Ni x ) 2 As 2 single crystals journal June 2009
Gap structure in the electron-doped iron–arsenide superconductor Ba(Fe 0.92 Co 0.08 ) 2 As 2 : low-temperature specific heat study journal February 2010
Calorimetric evidence of multiband superconductivity in Ba ( Fe 0.925 Co 0.075 ) 2 As 2 single crystals journal February 2010
Band Structure of the Heavily-Electron-Doped FeAs-Based Ba ( Fe , ​ Co ) 2 As 2 Superconductor Suppresses Antiferromagnetic Correlations journal April 2010
Quasiparticle Mass Enhancement Close to the Quantum Critical Point in BaFe 2 ( As 1 − x P x ) 2 journal June 2013
Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1 − x F x journal August 2008
Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe 2 As 2 journal July 2009
Specific heat and angle-resolved photoemission spectroscopy study of the superconducting gaps in LiFeAs journal June 2011
Strong pairbreaking in anisotropic superconductors journal May 2010
Possible Multiple Gap Superconductivity with Line Nodes in Heavily Hole-Doped Superconductor KFe 2 As 2 Studied by 75 As Nuclear Quadrupole Resonance and Specific Heat journal August 2009
Heat capacity jump at T c and pressure derivatives of superconducting transition temperature in the Ba 1 − x Na x Fe 2 As 2 ( 0.1 ≤ x ≤ 0.9 ) series journal January 2014
Coexistence of isotropic and extended s -wave order parameters in FeSe as revealed by low-temperature specific heat journal December 2011
Specific-heat jump at the superconducting transition and the quantum critical nature of the normal state of pnictide superconductors journal December 2009
Effect of annealing on the specific heat of Ba(Fe 1 − x Co x ) 2 As 2 journal February 2011
Low temperature specific heat of the hole-doped Ba 0.6 K 0.4 Fe 2 As 2 single crystals journal May 2009
Magnetic and superconducting transitions in Ba 1 − x K x Fe 2 As 2 studied by specific heat journal January 2010
Specific-heat discontinuity Δ C vs. T c in annealed Ba(Fe 1 − x Co x ) 2 As 2 journal August 2012
Phase diagram of iron pnictides if doping acts as a source of disorder journal December 2011
Jump in specific heat in the presence of a spin-density wave at the superconducting transition in iron pnictides journal October 2011
Superconducting gap symmetry of Ba 0.6 K 0.4 Fe 2 As 2 studied by angle-resolved photoemission spectroscopy journal March 2009
Specific Heat Measurements of Ba 0.68 K 0.32 Fe 2 As 2 Single Crystals: Evidence for a Multiband Strong-Coupling Superconducting State journal July 2010
Doping dependence of the specific heat of single-crystal BaFe 2 (As 1 − x P x ) 2 journal May 2012
Possible pairing states of the Fe-based superconductors journal October 2008
Impurity effects on the ± s -wave state of the iron-based superconductors journal February 2009
Calorimetric evidence of strong-coupling multiband superconductivity in Fe(Te 0 . 57 Se 0 . 43 ) single crystal journal April 2011

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Fe-based superconductors
specific heat jump versus Tc
BNC scailing
S±-pairing state
two band model