Thermoelectric properties of iron-based superconductors and parent compounds

2016/05/31 by I. Pallecchi, Federico Caglieris, F. Caglieris +1 · 1 citation
Materials Science · Physics and Astronomy · #Condensed matter physics #Fermi surface #Iron-based superconductors research #Nernst effect #Nernst equation #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #Thermoelectric effect #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1088/0953-2048/29/7/073002

published as Supercond. Sci. Technol. 29, 073002 (2016)

arxiv created 2016/05/31 · openalex publication_date 2016/06/01 · arxiv updated 2016/06/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Herewith, we review the available experimental data of thermoelectric transport properties of iron-based superconductors and parent compounds. We discuss possible physical mechanisms into play in determining the Seebeck effect, from whence one can extract information about Fermi surface reconstruction and Lifshitz transitions, multiband character, coupling of charge carriers with spin excitations and its relevance in the unconventional superconducting pairing mechanism, nematicity, quantum critical fluctuations close to the optimal doping for superconductivity, correlation. Additional information is obtained from the analysis of the Nernst effect, whose enhancement in parent compounds must be related partially to multiband transport and low Fermi level, but mainly to the presence of Dirac cone bands at the Fermi level. In the superconducting compounds, large Nernst effect in the normal state is explained in terms of fluctuating precursors of the spin density wave state, while in the superconducting state it mirrors the usual vortex liquid dissipative regime. A comparison between the phenomenology of thermoelectric behavior of different families of iron-based superconductors and parent compounds allows to evidence the key differences and analogies, thus providing clues on the rich and complex physics of these fascinating unconventional superconductors.

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