Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
Phys Rev Lett. 2012 Jan 6;108(1):016402. doi: 10.1103/PhysRevLett.108.016402. Epub 2012 Jan 5.
We address theoretically the evolution of the heavy fermion Fermi surface (FS) as a function of temperature (T), using a first principles dynamical mean-field theory approach combined with density functional theory. We focus on the archetypical heavy electrons in CeIrIn{5}. Upon cooling, both the quantum oscillation frequencies and cyclotron masses show logarithmic scaling behavior [∼ln(T{0}/T)] with different characteristic temperatures T{0}=130 and 50 K, respectively. The enlargement of the electron FSs at low T is accompanied by topological changes around T=10-50 K. The resistivity coherence peak observed at T≃50 K is the result of the competition between the binding of incoherent 4f electrons to the spd conduction electrons at Fermi level (E{F}) and the formation of coherent 4f electrons.
我们使用第一性原理动态平均场理论方法结合密度泛函理论，从理论上研究了重费米子费米面（FS）随温度（T）的演化。我们关注的是 CeIrIn{5}中的典型重电子。在冷却过程中，量子振荡频率和回旋质量都表现出对数标度行为[∼ln(T{0}/T)]，特征温度 T{0}=130 和 50 K 分别。在低温下，电子 FS 的扩大伴随着在 T=10-50 K 周围的拓扑变化。在 T≃50 K 观察到的电阻率相干峰是不相干 4f 电子与费米能级（E{F}）处的 spd 传导电子结合以及相干 4f 电子形成之间竞争的结果。
