Magnetoresistance in paramagnetic heavy fermion metals

Details Magnetoresistance in paramagnetic heavy fermion metals Magnetoresistance in paramagnetic heavy fermion metals

2008-12-22

arxiv.org/abs/0812.4101v2

J. Phys.: Condens. Matter Vol.21 (2009) 405602 (9pp)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 8 figures

Scientific paper

10.1088/0953-8984/21/40/405602

A theoretical study of magnetic field (h) effects on single-particle spectra and transport quantities of heavy fermion metals in the paramagnetic phase is carried out. We have employed a non-perturbative local moment approach (LMA) to the asymmetric periodic Anderson model within the dynamical mean field framework. The lattice coherence scale $\om_L$, which is proportional within the LMA to the spin-flip energy scale, and has been shown in earlier studies to be the energy scale at which crossover to single impurity physics occurs,increases monotonically with increasing magnetic field. The many body Kondo resonance in the density of states at the Fermi level splits into two with the splitting being proportional to the field itself. For h$\geq$ 0, we demonstrate adiabatic continuity from the strongly interacting case to a corresponding non-interacting limit, thus establishing Fermi liquid behaviour for heavy fermion metals in the presence of magnetic field. In the Kondo lattice regime, the theoretically computed magnetoresistance is found to be negative in the entire temperature range. We argue that such a result could be understood at $T\gtrsim \om_L$ by field-induced suppression of spin-flip scattering and at $T\lesssim \om_L$ through lattice coherence. The coherence peak in the heavy fermion resistivity diminishes and moves to higher temperatures with increasing field. Direct comparison of the theoretical results to the field dependent resistivity measurements in CeB$_6$ yields good agreement.

Affiliated with

Also associated with

No associations

Rating

Magnetoresistance in paramagnetic heavy fermion metals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetoresistance in paramagnetic heavy fermion metals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetoresistance in paramagnetic heavy fermion metals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-538316