Thermoelectric power and Hall coefficient measurements on Ba(Fe1-xTx)(2)As-2 (T=Co and Cu)

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2009-08-01
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Mun, Eun Deok
Bud'ko, Sergey L.
Ni, Ni
Thaler, Alex N.
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American Physical Society
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Canfield, Paul
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Physics and Astronomy
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Ames National Laboratory
Abstract
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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This article is published as Mun, Eun Deok, Sergey L. Bud’ko, Ni Ni, Alex N. Thaler, and Paul C. Canfield. "Thermoelectric power and Hall coefficient measurements on Ba (Fe 1− x T x) 2 As 2 (T= Co and Cu)." Physical Review B 80, no. 5 (2009): 054517. DOI: 10.1103/PhysRevB.80.054517. Copyright 2009 American Physical Society. Posted with permission.
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