6533b7d1fe1ef96bd125d724
RESEARCH PRODUCT
Energy scales and magnetoresistance at a quantum critical point
M. Ya. AmusiaVladimir A. StephanovichVasily R. ShaginyanVasily R. ShaginyanVasily R. ShaginyanKonstantin G. PopovAlfred Z. Msezanesubject
Quantum phase transitionPhysicsMagnetoresistanceCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)General Physics and AstronomyFOS: Physical sciences01 natural sciences010305 fluids & plasmasMagnetizationCondensed Matter - Strongly Correlated ElectronsEffective mass (solid-state physics)Quantum critical point0103 physical sciencesQuasiparticleStrongly correlated materialCondensed Matter::Strongly Correlated Electrons010306 general physicsScalingdescription
The magnetoresistance (MR) of CeCoIn_5 is notably different from that in many conventional metals. We show that a pronounced crossover from negative to positive MR at elevated temperatures and fixed magnetic fields is determined by the scaling behavior of quasiparticle effective mass. At a quantum critical point (QCP) this dependence generates kinks (crossover points from fast to slow growth) in thermodynamic characteristics (like specific heat, magnetization etc) at some temperatures when a strongly correlated electron system transits from the magnetic field induced Landau Fermi liquid (LFL) regime to the non-Fermi liquid (NFL) one taking place at rising temperatures. We show that the above kink-like peculiarity separates two distinct energy scales in QCP vicinity - low temperature LFL scale and high temperature one related to NFL regime. Our comprehensive theoretical analysis of experimental data permits to reveal for the first time new MR and kinks scaling behavior as well as to identify the physical reasons for above energy scales.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-02-11 |