Thermoelectric power and Hall coefficient measurements on BaFe1-xTMx2As2 TM = Co and Cu - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: Temperature dependent thermoelectric power TEP data on BaFe1-xTMx2As2 TM= Co and Cu, complemented by the Hall coefficient data on the samples from thesame batches, have been measured. For Co-doping we clearly see a change in thetemperature dependent TEP and Hall coefficient data when the sample is doped tosufficient $e$ the number of extra electrons associated with the TM doping soas to stabilize low temperature superconductivity. Remarkably, a similar changeis found in the Cu-doped samples at comparable e-value, even though thesecompounds do not superconduct. These changes possibly point to a significantmodification of the Fermi surface - band structure of BaFe1-xTM x2As2 atsmall electron doping, that in the case of Co-doping is just before, andprobably allows for, the onset of superconductivity. These data further suggestthat suppression of the structural - magnetic phase transition and theestablishment of a proper e-value are each necessary but, individually, notsufficient conditions for superconductivity.



Author: Eun Deok Mun, Sergey L. Bud'ko, Ni Ni, Paul C. Canfield

Source: https://arxiv.org/







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