Energy scales and magnetoresistance at a quantum critical point

Abstract

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.

7 pages, 6 figures

References in corpus (7)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Multiple energy scales at a quantum critical point
• Anomalous Transport Phenomena in Fermi Liquids with Strong Magnetic Fluctuations
• Nonvanishing Energy Scales at the Quantum Critical Point of CeCoIn5
• Universal Behavior of Two-Dimensional 3He at Low Temperatures
• Universal low-temperature behavior of the CePd_{1-x}Rh_x ferromagnet

Cited by in corpus (3)

• Strongly correlated Fermi-systems: non-Fermi liquid behavior, quasiparticle effective mass and their interplay
• Nature of the quantum critical point as disclosed by extraordinary behavior of magnetotransport and the Lorentz number in the heavy-fermion metal YbRh2Si2
• Energy scales and the non-Fermi liquid behavior in YbRh2Si2