Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$

Abstract

The link between the metamagnetic transition and novel spin-triplet superconductivity of UTe${}_2$ was discussed thermodynamically through magnetostriction measurements in a pulsed-magnetic field. We revealed a discontinuous magnetostriction across the metamagnetic transition at ${\mu }_0{H}_{\mathrm{m}}\approx 35$~T for the applied magnetic fields along the crystallographic $b$ axis in the orthorhombic structure. The resultanting volume magnetostriction of $\Delta V/V\approx -5.9\times 10^{-4}$ gives the initial pressure dependence of $H_{\mathrm{m}}$ by employing the Clausius-Clapeyron's equation, which agrees with previous pressure experiments. Further, significant anisotropic magnetostriction (AMS), derived by subtracting the averaged linear magnetostriction, was revealed. Contrary to the weakly field-dependent AMS along the $a$ axis, those along the $b$ and $c$ axes show strong field dependences with a similar magnitude but with opposite signs, indicating its lattice instability. The relationship between characteristic energy scales of magnetic fields and temperatures was discussed in terms of the Grüneisen parameters compared to the other $f$-electron systems. The volume shrinkage in UTe${}_2$ at $H_{\mathrm{m}}$, contrary to the volume expansion in typical heavy fermion metamagnets, pushes to invoke the link with the valence instability related to the itinerant-localized dual nature of the U magnetism.

6 pages, 5 figures, including supplemental material. To be published in Journal of Physical Society of Japan

References in corpus (18)

• Unconventional Superconductivity in Heavy Fermion UTe2
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• 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
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Heavy fermions in high magnetic field
• Magnetic-Field Control of Quantum Critical Points of Valence Transition
• Valence Fluctuations Revealed by Magnetic Field Scan: Comparison with Experiments in YbXCu_4 (X=In, Ag, Cd) and CeYIn_5 (Y=Ir, Rh)
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
• Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
• Dimensionality driven enhancement of ferromagnetic superconductivity in URhGe
• Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Core-Level Photoelectron Spectroscopy Study of 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}