On Sharp Enhancement of Effective Mass of Quasiparticles and Coefficient of T^{2} Term of Resistivity around First-Order Metamagnetic Transition Observed in UTe_{2}

Abstract

The mechanism underlying the enhancement of the Sommerfeld coefficient of quasiparticles at the first-order metamagnetic transition in UTe_2, reported by Miyake et al. in J. Phys. Soc. Jpn. 88, 063706 (2019), is discussed theoretically by taking into account the ferromagnetic order-parameter fluctuations on the basis of the Landau theory of phase transition. We find that the enhanced ferromagnetic spin fluctuation gives rise to the enhancement of the effective mass of the quasiparticles or the Sommerfeld coefficient γ,which is consistent with the experimental observations. At the same time, the Kadowaki-Woods type scaling around the metamagnetic transition, reported by Imajo et al.in J. Phys. Soc. Jpn. 88, 083705 (2019) and Knafo et al. in J. Phys. Soc. Jpn. 88, 063705 (2019), is also understood semi-quantitatively by assuming reasonable values of parameters of Landau-type free energy reproducing key quantities characterizing the metamagnetic transition.

arXiv commentAccepted for publication in J. Phys. Soc. Jpn

References in corpus (11)

• Spontaneously polarized half-gapped superconductivity
• Unconventional Superconductivity in Heavy Fermion UTe2
• Extreme magnetic field-boosted superconductivity
• Coexistence of ferromagnetic fluctuations and superconductivity in the actinide superconductor UTe2
• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Exponent relations at quantum phase transitions, with applications to metallic quantum ferromagnets
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
• Pressure Evolution of the Ferromagnetic and Field Re-entrant Superconductivity in URhGe
• Anomalous Local Fermi Liquid in $f^2$-Singlet Configuration: Impurity Model for Heavy-Electron System UPt_3

Cited by in corpus (7)

• Unconventional Superconductivity in UTe2
• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Non-unitary triplet superconductivity tuned by field-controlled magnetization --URhGe, UCoGe and UTe${}_2$--
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$