Wiedemann-Franz law in iron-based superconductor Fe&lt;sub&gt;1+&lt;em&gt;d&lt;/em&gt;&lt;/sub&gt;Te&lt;sub&gt;1-&lt;em&gt;x&lt;/em&gt;&lt;/sub&gt;Se&lt;em&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/em&gt;

Matusiak, Marcin; Babij, Michał; Pomjakushina, Ekaterina; Conder, Kazimierz

doi:10.1002/pssb.201552778

Wiedemann-Franz law in iron-based superconductor Fe_1+dTe_1-xSe_x

Matusiak M, Babij M, Pomjakushina E & Conder K

Citation

Matusiak, M., Babij, M., Pomjakushina, E., & Conder, K. (2016). Wiedemann-Franz law in iron-based superconductor Fe_1+dTe_1-xSe_x. Physica Status Solidi B: Basic Research, 253(8), 1607-1611. https://doi.org/10.1002/pssb.201552778

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:47009

We present results of measurements of the transport phenomena in the series of Fe_1+dTe_1−xSe_x single crystals. Namely, we investigate the longitudinal and transverse electrical and thermal conductivities in the parent compound Fe_1+dTe as well as superconducting Fe_1+dTe_0.85Se_0.15 and Fe_1+dTe_0.59Se_0.41. 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 Fe_1+dTe behaves like the Fermi liquid being predominantly elastically scattered. In contrast, low temperature properties of Fe_1+dTe_0.85Se_0.15 and Fe_1+dTe_0.59Se_0.41 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 Fe_1+dTe_0.85Se_0.15, whereas with the electron-like band in case of Fe_1+dTe_0.59Se_0.41.