000217630 001__ 217630
000217630 005__ 20190507143827.0
000217630 0247_ $$2doi$$a10.1088/0953-8984/28/11/115701
000217630 022__ $$a0953-8984
000217630 02470 $$2ISI$$a000370733400015
000217630 037__ $$aARTICLE
000217630 245__ $$aUpper critical field, pressure-dependent superconductivity and electronic anisotropy of Sm4Fe2As2Te1-xO4-yFy
000217630 260__ $$bIop Publishing Ltd$$c2016$$aBristol
000217630 269__ $$a2016
000217630 300__ $$a6
000217630 336__ $$aJournal Articles
000217630 520__ $$aWe present a detailed study of the electrical transport properties of a recently discovered iron-based superconductor: Sm4Fe2As2Te0.72O2.8F1.2. We followed the temperature dependence of the upper critical field by resistivity measurement of single crystals in magnetic fields up to 16 T, oriented along the two main crystallographic directions. This material exhibits a zero-temperature upper critical field of 90 T and 65 T parallel and perpendicular to the Fe2As2 planes, respectively. An unprecedented superconducting magnetic anisotropy gamma(H) = H-c2(ab)/H-c2(c) similar to 14 is observed near T-c, and it decreases at lower temperatures as expected in multiband superconductors. Direct measurement of the electronic anisotropy was performed on microfabricated samples, showing a value of rho(c)/rho(ab) (300 K) similar to 5 that rises up to 19 near T-c. Finally, we have studied the pressure and temperature dependence of the in-plane resistivity. The critical temperature decreases linearly upon application of hydrostatic pressure (up to 2 GPa) similarly to overdoped cuprate superconductors. The resistivity shows saturation at high temperatures, suggesting that the material approaches the Mott-Ioffe-Regel limit for metallic conduction. Indeed, we have successfully modelled the resistivity in the normal state with a parallel resistor model that is widely accepted for this state. All the measured quantities suggest strong pressure dependence of the density of states.
000217630 6531_ $$aFe-based superconductors
000217630 6531_ $$aupper critical field
000217630 6531_ $$ahydrostatic pressure
000217630 6531_ $$aelectronic anisotropy
000217630 6531_ $$anovel materials
000217630 700__ $$g227410$$0246855$$aPisoni, A.
000217630 700__ $$aKatrych, S.
000217630 700__ $$aSzirmai, P.
000217630 700__ $$aNáfrádi, B.
000217630 700__ $$aGaál, R.
000217630 700__ $$aKarpinski, J.
000217630 700__ $$aForró, L.
000217630 773__ $$j28$$tJournal Of Physics-Condensed Matter$$k11$$q115701
000217630 909C0 $$0252456$$pLPCM$$xU10143
000217630 909CO $$particle$$ooai:infoscience.tind.io:217630
000217630 917Z8 $$x167625
000217630 937__ $$aEPFL-ARTICLE-217630
000217630 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000217630 980__ $$aARTICLE