c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail (Preprint/Prepublication) Année : 2023

c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure

Résumé

The electrical resistivity of the unconventional superconductor UTe$_2$ shows very anisotropic behavior in the normal state depending on the current direction. In the present paper we show that the maximum in the resistivity $ρ_c$ for current applied along the $c$ axis at $T^{\rm max}_{ρ_c} \approx 14.75$~K follows the minimum in the thermal expansion $T_α^\star$ along $b$ axis. Under a magnetic field applied along the $b$ axis, $T^{\rm max}_{ρ_c}$ can be tracked up to the critical point of the first order metamagnetic transition, which is located near 6~K and 34.5~T. Surprisingly, at the metamagnetic field $H_m$ the resistivity $ρ_c$ shows a steplike decrease while the resistivities $ρ_a$ and $ρ_b$, for current along the $a$ and $b$ axis, respectively, show a steplike increase. Under hydrostatic pressure $T^{\rm max}_{ρ_c}$ and $H_m$ decrease significantly up to the critical pressure $p_c$ at which superconductivity is suppressed and a long range antiferromagnetic order appears. We show that the phase diagram at different pressures can be scaled by $T^{\rm max}_{ρ_c}$ in field and temperature suggesting that this temperature scale is governing the main interactions in the normal state.

Dates et versions

hal-04297462 , version 1 (21-11-2023)

Identifiants

Citer

G. Knebel, A. Pourret, S. Rousseau, N. Marquardt, D. Braithwaite, et al.. c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure. 2023. ⟨hal-04297462⟩
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