On Pulsed Magnetic Field Measurements of Enhanced Sommerfeld Constant γ and A-Coefficient around Metamagnetic Transition in UTe2
Abstract
It is discussed from theoretical viewpoint why the aspects of enhancements in the A-coefficient in the resistivityKnafoand the Sommerfeld constant γ AtsushiMiyake,Imajo observed in UTe2 around the metamagnetic transition at H=Hm are so different. In particular, the discussions are focused on the reason why the H dependence of the A-coefficient reported in Ref.Knafo and γ reported in Ref.AtsushiMiyakeis almost symmetric around H=H m, while γ(H) at H Hm, reported in Ref.Imajo, is considerably suppressed compared to that at H Hm. A key point to solve this seeming paradox is to take properly into account the difference in time scales of probes used in those measurements of pulsed magnetic field method with different time scales. Another crucial effect is the time dependent non-uniform magnetic fluctuations remaining in a certain period of time after the first-order metamagnetic transition has occurred. Indeed, the time scales of former measurements in Refs.Knafo,AtsushiMiyake are far shorter than that of the latter one in Ref.Imajo, which can solve the above paradox.
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