Thermal properties of SmFeAs(O1-xFx) as probe of the interplay between electrons and phonons

Abstract

A comparative study of thermal properties of SmFeAsO, SmFeAs(O0.93F0.07) and SmFeAs(O0.85F0.15) samples is presented. Specific heat and thermal conductivity show clear evidences of the spin density wave (SDW) ordering below TSDW 135 K in undoped SmFeAsO. At low level of F-doping, SmFeAs(O0.93F0.07), SDW ordering is suppressed and superconducting features are not yet optimally developed in both specific heat and thermal conductivity. At optimal level of F-doping SmFeAs(O0.85F0.15) anomalies related to the superconducting transition are well noticeable. By a compared analysis of doped and undoped samples we conclude that, despite F-doping modifies definitely the electronic ground state, it does not substantially alter phonon and electron parameters, like phonon modes, Sommerfeld coefficient, electro-phonon coupling. The analysis of the thermal conductivity curves provides an evaluation of SDW and superconducting energy gap, showing that phonons can suitably probe features of electronic ground state.

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Cited by in corpus (26)

• Electronic and Magnetic Phase Diagram of a Superconductor, SmFeAsO1-xFx
• Quasiparticle relaxation dynamics in spin-density-wave and superconducting SmFeAsO_{1-x}F_{x} single crystals
• Transport and superconducting properties of Fe-based superconductors: SmFeAs(O1-x Fx) versus Fe1+y (Te1-x, Sex)
• Doping dependence of femtosecond quasi-particle relaxation dynamics in Ba(Fe,Co)_2As_2 single crystals: possible evidence for normal state nematic fluctuations
• Anisotropic Phase Diagram and Superconducting Fluctuations in SmFeAsO0.85F0.15
• Evidence for multiple gaps in specific heat of LiFeAs crystals
• Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states
• Specific-heat study of superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong electron-correlation, and inhomogeneity
• Strong coupling of Sm and Fe magnetism in SmFeAsO as revealed by magnetic x-ray scattering
• Transport and infrared properties of SmFeAs(O1-xFx): from SDW to superconducting ordering
• The optical phonon spectrum of SmFeAsO
• Superconducting and magneto-transport properties of BiS2 based superconductor PrO1-xFxBiS2 (x = 0 to 0.9)
• Coupling between 4f and itinerant electrons in SmFeAsO1-xFx (0.15 < x < 0.2) superconductors: an NMR study
• Evidence of spin-density-wave order in RFeAsO from measurements of thermoelectric power
• Magnetic characterization of undoped and 15%F doped LaFeAsO and SmFeAsO compounds
• Mott-insulator to metal transition in filling-controlled SmMnAsO_{1-x}
• Fully gapped superconductivity in SrNi${}_2$P${}_2$
• Magnetic ordering of the RE lattice in REFeAsO: the odd case of Sm. A specific heat investigation in high magnetic field
• Appearance and disappearance of superconductivity in SmFe1-xNixAsO (x = 0.0 to 1.0)
• Fe-spin reorientation in PrFeAsO : Evidences from resistivity and specific heat studies
• Electronic Behavior of Superconducting SmFeAsO0.75
• Thermal conductivity and annealing effects in the iron-based superconductor FeSe${}_{0.3}$Te${}_{0.7}$
• Signature of point nodal superconductivity in the Dirac semimetal PdTe
• Magneto-transport and magnetic susceptibility of SmFeAsO1-xFx (x = 0.0 and 0.20)
• Study of Ni and Zn doped CeOFeAs: Effect on the structural transition and specific heat capacity
• Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors