ﻻ يوجد ملخص باللغة العربية
Thermoelectric power ($S$) and Hall effect ($R_mathrm{H}$) measurements on the paramagnetic superconductor UTe$_2$ with magnetic field applied along the hard magnetization $b$-axis are reported. The first order nature of the metamagnetic transition at $H_mathrm{m}=H^b_mathrm{c2}=35$~T leads to drastic consequences on $S$ and $R_mathrm{H}$. In contrast to the field dependence of the specific heat in the normal state through $H_mathrm{m}$, $S(H)$ is not symmetric with respect to $H_mathrm{m}$. This implies a strong interplay between ferromagnetic (FM) fluctuations and a Fermi-surface reconstruction at $H_mathrm{m}$. $R_mathrm{H}$ is very well described by incoherent skew scattering above the coherence temperature $T_mathrm{m}$ corresponding roughly to the temperature of the maximum in the susceptibility $T_{chi_mathrm{max}}$ and coherent skew scattering at lower temperatures. The discontinuous field dependence of both, $S(H)$ and the ordinary Hall coefficient $R_0$, at $H_mathrm{m}$ and at low temperature, provides evidence of a change in the band structure at the Fermi level.
We present different transport measurements up to fields of 29~T in the recently discovered heavy-fermion superconductor UTe$_{2}$ with magnetic field $H$ applied along the easy magnetization a-axis of the body-centered orthorhombic structure. The th
We report on the electronic and thermodynamic properties of the antiferromagnetic metal uranium mononitride with a Neel temperature $T_Napprox 53,$K. The fabrication of microstructures from single crystals enables us to study the low-temperature meta
We have studied the magnetization of the recently discovered heavy fermion superconductor UTe$_2$ up to 56 T in pulsed-magnetic fields. A first-order metamagnetic transition has been clearly observed at $H_{rm m}$ =34.9 T when the magnetic field $H$
Some materials can have the dispersionless parts in their electronic spectra. These parts are usually called flat bands and generate the corps of unusual physical properties of such materials. These flat bands are induced by the condensation of fermi
The nature of the pseudogap phase remains a major barrier to our understanding of cuprate high-temperature superconductivity. Whether or not this metallic phase is defined by any of the reported broken symmetries, the topology of its Fermi surface re