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

Abstract

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 ${\rho }_c$ for current applied along the $c$ axis at $T_{{\rho }_c}^{\max }\approx 14.75$~K follows the minimum in the thermal expansion $T_{\alpha }^{\star }$ along $b$ axis. Under a magnetic field applied along the $b$ axis, $T_{{\rho }_c}^{\max }$ 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 ${\rho }_c$ shows a steplike decrease while the resistivities ${\rho }_a$ and ${\rho }_b$, for current along the $a$ and $b$ axis, respectively, show a steplike increase. Under hydrostatic pressure $T_{{\rho }_c}^{\max }$ 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 $T_{{\rho }_c}^{\max }$ in field and temperature suggesting that this temperature scale is governing the main interactions in the normal state.

accepted in Phys. Rev. B

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Cited by in corpus (6)

• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Incommensurate antiferromagnetism in UTe2 under pressure
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T