Smith M F, McKenzie Ross H
University of Queensland, Department of Physics, 4072 Brisbane, Queensland, Australia.
Phys Rev Lett. 2008 Dec 31;101(26):266403. doi: 10.1103/PhysRevLett.101.266403.
The temperature dependences of the interlayer electrical and thermal resistivity in a layered metal are calculated for Fermi liquid quasiparticles which are scattered inelastically by two-dimensional antiferromagnetic spin fluctuations. Both resistivities have a linear temperature dependence over a broad temperature range. Extrapolations to zero temperature made from this linear-T range give values that appear to violate the Wiedemann-Franz law. However, below a low-temperature scale, which becomes small close to the critical point, a recovery of this law occurs. Our results describe recent measurements on CeCoIn5 near a magnetic field-induced quantum phase transition. Hence, the experiments do not necessarily imply a non-Fermi liquid ground state.
对于通过二维反铁磁自旋涨落发生非弹性散射的费米液体准粒子，计算了层状金属中层间电阻和热阻的温度依赖性。在很宽的温度范围内，这两种电阻都具有线性温度依赖性。从这个线性温度范围外推到零温度得到的值似乎违反了维德曼 - 夫兰兹定律。然而，在一个低温标度以下，该标度在接近临界点时变得很小，这个定律会恢复。我们的结果描述了最近在磁场诱导的量子相变附近对CeCoIn5的测量。因此，这些实验不一定意味着存在非费米液体基态。
