Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$

Abstract

We present magnetoresistivity measurements on the heavy-fermion superconductor UTe${}_2$ in pulsed magnetic fields ${\mu }_{0}H$ up to 68~T and temperatures $T$ from 1.4 to 80~K. Magnetic fields applied along the three crystallographic directions $\mathbf{a}$ (easy magnetic axis), $\mathbf{b}$, and $\mathbf{c}$ (hard magnetic axes), are found to induce different phenomena - depending on the field direction - beyond the low-field suppression of the superconducting state. For $\mathbf{H}\parallel \mathbf{a}$, a broad anomaly in the resistivity is observed at ${\mu }_0{H}^{\ast }\simeq 10$~T and $T=1.4$~K. For $\mathbf{H}\parallel \mathbf{c}$, no magnetic transition nor crossover are observed. For $\mathbf{H}\parallel \mathbf{b}$, a sharp first-order-like step in the resistivity indicates a metamagnetic transition at the field ${\mu }_0{H}_m\simeq 35$~T. When the temperature is raised signature of first-order metamagnetism is observed up to a critical endpoint at $T_{CEP}\simeq 7$~K. At higher temperatures a crossover persists up to 28~K, i.e., below the temperature $T_{\chi }^{max}=35$~K where the magnetic susceptibility is maximal. A sharp maximum in the Fermi-liquid quadratic coefficient $A$ of the low-temperature resistivity is found at $H_m$. It indicates an enhanced effective mass associated with critical magnetic fluctuations, possibly coupled with a Fermi surface instability. Similarly to the URhGe case, we show that UTe${}_2$ is a candidate for field-induced reentrant superconductivity in the proximity of $H_m$.

5 pages, 4 Figures, to be published in the Journal of the Physical Society of Japan includes Supplementary Materials (15 pages, 11 Figures)

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Cited by in corpus (10)

• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
• Low energy band structure and symmetries of UTe2 from angle resolved photoemission spectroscopy
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
• Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Expansion of the high field-boosted superconductivity in UTe2 under pressure
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• On Sharp Enhancement of Effective Mass of Quasiparticles and Coefficient of T^{2} Term of Resistivity around First-Order Metamagnetic Transition Observed in UTe_{2}