Journal
PHYSICAL REVIEW B
Volume 80, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.054517
Keywords
band structure; barium compounds; cobalt compounds; copper compounds; doping; Fermi surface; Hall effect; high-temperature superconductors; iron compounds; solid-state phase transformations; thermoelectric power
Funding
- U. S. Department of Energy-Basic Energy Sciences [DE-AC02-07CH11358]
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Temperature-dependent thermoelectric power (TEP) data on Ba(Fe1-xTMx)(2)As-2 (TM=Co and Cu), complemented by the Hall coefficient data on the samples from the same batches, have been measured. For Co doping we clearly see a change in the temperature-dependent TEP and Hall coefficient data when the sample is doped to sufficient e (the number of extra electrons associated with the TM doping) so as to stabilize low-temperature superconductivity. Remarkably, a similar change is found in the Cu-doped samples at comparable e value, even though these compounds do not superconduct. These changes possibly point to a significant modification of the Fermi surface/band structure of Ba(Fe1-xTMx)(2)As-2 at small electron doping, that in the case of Co doping is just before, and probably allows for, the onset of superconductivity. These data further suggest that suppression of the structural/magnetic phase transition and the establishment of a proper e value are each necessary but, individually, not sufficient conditions for superconductivity.
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