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Magnetotransport studies of superconductingPr4Fe2As2Te1−xO4

Authors :
Andrea Pisoni
Sergiy Katrych
Bálint Náfrádi
J. Karpinski
Péter Szirmai
L. Forró
R. Gaál
Source :
Physical Review B. 93
Publication Year :
2016
Publisher :
American Physical Society (APS), 2016.

Abstract

We report a study of the electrical transport properties of single crystals of $\mathrm{P}{\mathrm{r}}_{4}\mathrm{F}{\mathrm{e}}_{2}\mathrm{A}{\mathrm{s}}_{2}\mathrm{T}{\mathrm{e}}_{1\ensuremath{-}x}{\mathrm{O}}_{4}$, a recently discovered iron-based superconductor. Resistivity, Hall effect, and magnetoresistance are measured in a broad temperature range revealing the role of electrons as dominant charge carriers. The significant temperature dependence of the Hall coefficient and the violation of Kohler's law indicate multiband effects in this compound. The upper critical field and the magnetic anisotropy are investigated in fields up to 16 T, applied parallel and perpendicular to the crystallographic $c$ axis. Hydrostatic pressure up to 2 GPa linearly increases the critical temperature and the resistivity residual ratio. A simple two-band model is used to describe the transport and magnetic properties of $\mathrm{P}{\mathrm{r}}_{4}\mathrm{F}{\mathrm{e}}_{2}\mathrm{A}{\mathrm{s}}_{2}\mathrm{T}{\mathrm{e}}_{1\ensuremath{-}x}{\mathrm{O}}_{4}$. The model can successfully explain the strongly temperature-dependent negative Hall coefficient and the high magnetic anisotropy, assuming that the mobility of electrons is higher than that of holes.

Details

ISSN :
24699969 and 24699950
Volume :
93
Database :
OpenAIRE
Journal :
Physical Review B
Accession number :
edsair.doi...........da714acdee0a13ad7804d9ecf2fff2f3
Full Text :
https://doi.org/10.1103/physrevb.93.094519