Abstract
We present results of measurements of the transport phenomena in the series of Fe1+dTe1−xSex single crystals. Namely, we investigate the longitudinal and transverse electrical and thermal conductivities in the parent compound Fe1+dTe as well as superconducting Fe1+dTe0.85Se0.15 and Fe1+dTe0.59Se0.41. This set of data allows us to verify validity of the Wiedemann–Franz law in the systems studied and consequently it is stated that the electronic system in the paramagnetic phase of Fe1+dTe behaves like the Fermi liquid being predominantly elastically scattered. In contrast, low temperature properties of Fe1+dTe0.85Se0.15 and Fe1+dTe0.59Se0.41 are affected likely by the emergence of antiferromagnetic fluctuations, which are expected to be (π,0) and (π,π), respectively. These seem to be coupled with the hole-like band in case of Fe1+dTe0.85Se0.15, whereas with the electron-like band in case of Fe1+dTe0.59Se0.41.
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