Shimura Yasuyuki, Zhang Qiu, Zeng Bin, Rhodes Daniel, Schönemann Rico, Tsujimoto Masaki, Matsumoto Yosuke, Sakai Akito, Sakakibara Toshiro, Araki Koji, Zheng Wenkai, Zhou Qiong, Balicas Luis, Nakatsuji Satoru
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan.
Phys Rev Lett. 2019 Jun 28;122(25):256601. doi: 10.1103/PhysRevLett.122.256601.
We report the discovery of giant and anisotropic magnetoresistance due to the orbital rearrangement in a non magnetic correlated metal. In particular, we measured the magnetoresistance under fields up to 31.4 T in the cubic Pr-based heavy fermion superconductor PrV_{2}Al_{20} with a non magnetic Γ_{3} doublet ground state, exhibiting antiferroquadrupole ordering below 0.7 K. For the [100] direction, we find that the high-field phase appears between 12 and 25 T, accompanied by a large jump at 12 T in the magnetoresistance (ΔMR∼100%) and in the anisotropic magnetoresistivity ratio by ∼20%. These observations indicate that the strong hybridization between the conduction electrons and anisotropic quadrupole moments leads to the Fermi surface reconstruction upon crossing the field-induced antiferroquadrupole (orbital) rearrangement.
我们报告了在一种非磁性关联金属中由于轨道重排而发现的巨大各向异性磁电阻。具体而言，我们在具有非磁性Γ₃双重态基态的立方Pr基重费米子超导体PrV₂Al₂₀中测量了高达31.4 T磁场下的磁电阻，该超导体在0.7 K以下呈现反铁四极序。对于[100]方向，我们发现高场相出现在12至25 T之间，同时磁电阻在12 T处有大幅跃升（ΔMR ∼ 100%），各向异性磁电阻率比跃升约20%。这些观察结果表明，传导电子与各向异性四极矩之间的强杂化作用导致在越过场诱导的反铁四极（轨道）重排时费米面发生重构。
