期刊
PHYSICAL REVIEW B
卷 62, 期 8, 页码 4945-4962出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.4945
关键词
-
We present a theory of the magnetotransport in weakly disordered metals close to an antiferromagnetic quantum-critical point, The anisotropic scattering from critical spin fluctuations is strongly influenced by weak but isotropic scattering from small amounts of disorder. This leads to a large regime where the resistivity obeys a scaling form rho= rho(0) + Delta rho approximate to rho(0) + T(3/2)f[T/rho(0),(p -p(c))/rho(0),B/rho(0)(3/2)], where rho(0) is the residual resistivity, B the magnetic field, and p-p(c)>0 measures the distance from the quantum-critical point on the paramagnetic side of the phase diagram. Orbital effects of the magnetic field are most pronounced in very clean samples for not too low temperatures, where the resistivity for increasing magnetic field crosses over from a linear temperature dependence Delta p similar to T root rho(0) to a resistivity linear in B and independent of T and rho(0). At higher magnetic fields, Delta rho saturates at a value proportional to T-1.5 or T-2/(p-p(c)). Deviations from scaling, the interplay of orbital and spin contributions of the magnetic field, and experimental test of the spin-fluctuation model are discussed in detail.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据