Sandu V, Cimpoiasu E, Katuwal T, Li Shi, Maple M B, Almasan C C
Department of Physics, Kent State University, Kent, OH 44242, USA.
Phys Rev Lett. 2004 Oct 22;93(17):177005. doi: 10.1103/PhysRevLett.93.177005. Epub 2004 Oct 20.
In-plane angular magnetoresistivity Deltarho(anis)(ab) measurements were made on Y(1-x)Pr(x)Ba(2)Cu(3)O(7-delta) single crystals in the pseudogap region. For x>/=0.2 single crystals, Deltarho(anis)(ab)(theta) displays a deviation from the typical quasiparticle contribution (proportional, sin((2)theta) for temperatures smaller than a certain value T(phi) in the pseudogap region. This deviation is consistent with a flux-flow type contribution to angular magnetoresistivity, indicating the presence of vortexlike excitations above the zero-field critical temperature in the pseudogap region.
在赝能隙区域对Y(1 - x)Pr(x)Ba(2)Cu(3)O(7 - δ)单晶进行了面内角磁阻率Δρ(anis)(ab)测量。对于x≥0.2的单晶，在赝能隙区域中，当温度低于某个值T(phi)时，Δρ(anis)(ab)(θ)偏离典型的准粒子贡献（与sin²θ成正比）。这种偏离与角磁阻率的磁通流型贡献一致，表明在赝能隙区域高于零场临界温度时存在类涡旋激发。
