Metamagnetic Transition in UCoAl Probed by Thermoelectricity Measurements

Abstract

We report field and temperature dependent measurements of the thermoelectric power (TEP) and the Nernst effect in the itinerant metamagnet UCoAl. The magnetic field is applied along the easy magnetization c-axis in the hexagonal crystal structure. The metamagnetic transition from the paramagnetic phase at zero field to the field induced ferromagnetic (FM) state is of first order at low temperatures and becomes a broad crossover above the critical temperature $T_M^{\star }\sim 11$ K. The field-dependence of the TEP reveals that the effective mass of the hole carriers changes significantly at the metamagnetic transition. The TEP experiment reflects the existence of different carrier types in good agreement with band structure calculations and previous Hall effect experiments. According to the temperature dependence of the TEP, no Fermi liquid behavior appears in the paramagnetic state down to 150 mK, but is achieved only in the field induced ferromagnetic state.

5 pages, 4 figures

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Cited by in corpus (10)

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• Superconductivity and Ferromagnetic Quantum Criticality in Uranium Compounds
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Evidence of Fermi-Surface Reconstruction at the Metamagnetic Transition of the Strongly Correlated Superconductor UTe2
• Critical behavior of magnetization in URhAl:Quasi-two-dimensional Ising system with long-range interactions
• Ferromagnetic Quantum Criticality Studied by Hall Effect Measurements in UCoAl
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• Quantum criticality and Lifshitz transition in the Ising system CeRu2Si2: Comparison with YbRh2Si2
• Ferromagnetic Critical Behavior in U(Co${}_{1-x}$Fe${}_x$)Al ($0\le x\le 0.02$) Studied by ${}^{59}$Co Nuclear Quadrupole Resonance Measurement
• Dramatic elastic response at the critical end point in UTe${}_2$