Fernández-Lomana Marta, Barrena Víctor, Wu Beilun, Delgado Sara, Mompeán Federico, García-Hernández Mar, Suderow Hermann, Guillamón Isabel
Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Unidad Asociada UAM-CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas (ICMM-CSIC), Unidad Asociada UAM-CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain.
J Phys Condens Matter. 2021 Feb 2;33(14). doi: 10.1088/1361-648X/abdbea.
The magnetoresistance (MR) of iron pnictide superconductors is often dominated by electron-electron correlations and deviates from theor saturating behaviors expected for uncorrelated metals. Contrary to similar Fe-based pnictide systems, the superconductor LaRuP(= 4 K) shows no enhancement of electron-electron correlations. Here we report a non-saturating MR deviating from theor saturating behaviors in LaRuP. We present results in single crystals of LaRuP, where we observe a MR followingup to 22 T. We discuss our result by comparing the bandstructure of LaRuPwith that of Fe based pnictide superconductors. The different orbital structures of Fe and Ru leads to a 3D Fermi surface with negligible bandwidth renormalization in LaRuP, that contains a large open sheet over the whole Brillouin zone. We show that the large MR in LaRuPis unrelated to the one obtained in materials with strong electron-electron correlations and that it is compatible instead with conduction due to open orbits on the rather complex Fermi surface structure of LaRuP.
铁基超导材料的磁电阻（MR）通常受电子-电子关联主导，偏离了非关联金属预期的理论饱和行为。与类似的铁基磷化物体系不同，超导体LaRuP（= 4 K）未表现出电子-电子关联的增强。在此，我们报道了LaRuP中偏离理论饱和行为的非饱和磁电阻。我们展示了LaRuP单晶的结果，在其中我们观察到磁电阻高达22 T。我们通过比较LaRuP与铁基磷化物超导材料的能带结构来讨论我们的结果。Fe和Ru不同的轨道结构导致LaRuP中具有可忽略带宽重整化的三维费米面，其在整个布里渊区包含一个大的开放面。我们表明，LaRuP中的大磁电阻与在具有强电子-电子关联的材料中获得的磁电阻无关，相反，它与LaRuP相当复杂的费米面结构上的开放轨道导致的传导相兼容。
