Abstract
We report precision c-axis magnetic measurements on a high-quality single crystal of the heavy fermion metamagnet UCoAl. The metamagnetic transition at HM changes from 1st order at low temperature to a crossover at high temperature. HM is nearly linearly increasing with increasing temperature up to a critical temperature T0. The critical temperature T0 is determined from both the field and the temperature dependences of magnetization to be ∼ 11 K. The field dependence of the Sommerfeld coefficient γ is estimated from M(T) by using a Maxwell relation. γ(H) shows a step-like decrease at HM. This behavior is consistent with the previous reports of specific heat and resistivity measurements at low temperatures.
Highlights
INTRODUCTIONMetamagnetic transition from a PM to a FM phase
The heavy fermion UCoAl is known to be a unique system with a metamagnetic transition from a paramagnetic
In itinerant ferromagnets with tricritical points, the metamagnetic transition from along the c-axis, the paramagnetic ground state becomes a field-induced ferromagnetic state the paramagnetic(PM) phase to the ferromagnetic(FM) as the magnetic field increases through the metamagphase possesses the wing structure of the first order transition in the temperature-pressure-magnetic field phase diagram [1,2,3,4]
Summary
Metamagnetic transition from a PM to a FM phase. Metamagnetism and quantum criticality in strongly to a ferromagnetic ground state in uranium-based comcorrelated electron systems have attracted much attention because of the possibility of new quantum phases, and appear related to unconventional superconductivity pounds. In itinerant ferromagnets with tricritical points, the metamagnetic transition from along the c-axis (magnetic easy axis), the paramagnetic ground state becomes a field-induced ferromagnetic state the paramagnetic(PM) phase to the ferromagnetic(FM) as the magnetic field increases through the metamagphase possesses the wing structure of the first order transition in the temperature-pressure-magnetic field phase diagram [1,2,3,4]. We present the magnetic phase diagram for fields along the c-axis at ambient pressure
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