Thermoelectric power of Ba(Fe_1−xCo_x)₂As₂(0 ≤ x ≤ 0.05) and Ba(Fe_1−xRh_x)₂As₂(0 ≤ x ≤ 0.171)

Magnetic ordering and structural distortion in Ru-doped BaFe2As2single crystals studied by neutron and x-ray diffraction

“…32,33 Ru substitution on the Fe site in Ba(Fe 1−x Ru x ) 2 As 2 was recently reported to exhibit properties similar to the electron-doped BaFe 2 As 2 series but, again, at higher doping compositions. [34][35][36][37] The structural and AFM transition temperatures are suppressed with increasing x and superconductivity occurs at x ≈ 0.16.…”

Signatures of quantum criticality in the thermopower of Ba(Fe1−xCox)2Arsenijević1, Hodovanets2, Gáal3 et al. 2013Phys. Rev. B331320View full textAdd to dashboardCite

“…The reconstructed hole Dirac-like band in the SDW state was predicted [46] and observed [47] and it induces a positive contribution to the otherwise small and compensated thermopower of BaFe 2 As 2 [48]. This contribution to S is T -dependent [49] and it is suppressed with Co substitution [44]. Its decrease is responsible for the increase of |S|/T with lowering temperature in the low electrondoping regime.…”

“…The tightly spaced Co substitution in Ba(Fe 1−x Co x ) 2 As 2 single crystals allows us to precisely map the whole S/T phase diagram [44,45]. Thus, we can study the evolution of S as the system undergoes several Lifshitz transitions [37].…”

“…1. The Co concentrations used here were determined by using the wavelength dispersive x-ray spectroscopy [44]. We separated the data into three groups with each group showing a characteristic T -dependence.…”

Fermi surface reconstruction in(Ba1−xKx)Fe2As2 Hodovanets1, Liu2, Jesche3 et al. 2014Phys. Rev. BSelf Cite313360View full textAdd to dashboardCite

“…The samples were then cut and mounted directly on the surface of the SD package of the Cernox thermometers using Du-Pont 4929N silver paste to ensure thermal and electrical contact. The silver paste was allowed to cure at room temperature and 1 atm of air for about 24 h in a desiccator 33 . The samples were mounted so that the thermal gradient was applied in the ab-plane.…”