论文标题
在急剧增强准粒子的有效质量和T^{2}的系数上，在Ute_ {2}中观察到的一阶元磁过渡周围的电阻率术语
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}
论文作者
论文摘要
Miyake等人报道，在UTE_2中一阶元磁过渡时，准颗粒的Sommerfeld系数增强的基础机制。在J. Phys。 Soc。 JPN。 88，063706（2019）在理论上通过根据兰道相变理论的基础来考虑铁磁秩序参数的波动来讨论。我们发现增强的铁磁自旋波动会增加准粒子的有效质量或Sommerfeld系数γ，这与实验观察结果一致。同时，Imajo等人J. Phys。 Soc。 JPN。 88，083705（2019）和Knafo等。在J. Phys。 Soc。 JPN。 88，063705（2019）也通过假设Landau-Type自由能参数的合理值重现了表征元磁过渡的关键量的合理值。
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.
