W. Knafo
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View article: Anisotropic collapse of electronic correlations in the ferromagnet UGe$_2$ under high magnetic field
Anisotropic collapse of electronic correlations in the ferromagnet UGe$_2$ under high magnetic field Open
We present electrical-resistivity measurements on the prototypical heavy-fermion ferromagnet UGe$_2$ under pulsed magnetic field up to 60~T. An anisotropic field-induced suppression of the electronic correlations is revealed. The electrica…
View article: Incommensurate Antiferromagnetism in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>UTe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> under Pressure
Incommensurate Antiferromagnetism in under Pressure Open
The discovery of multiple superconducting phases in UTe2 boosted research on correlated-electron physics. This heavy-fermion paramagnet was rapidly identified as a reference compound to study the interplay between magnetism and unconventio…
View article: Field-induced electronic correlations and superconductivity in UTe$_2$ beyond 40~T
Field-induced electronic correlations and superconductivity in UTe$_2$ beyond 40~T Open
Several superconducting phases have been discovered close to a metamagnetic transition in the heavy-fermion compound UTe$_2$, unveiling a close relation between its superconducting and magnetic properties. Although suspected to be of magne…
View article: Metamagnetism in the high-pressure tetragonal phase of UTe$_2$
Metamagnetism in the high-pressure tetragonal phase of UTe$_2$ Open
A structural orthorhombic-to-tetragonal phase transition was recently discovered in the heavy-fermion compound UTe$_2$ at a pressure $p^*\simeq3-8$~GPa [Honda \textit{et al.}, J. Phys. Soc. Jpn. \textbf{92}, 044702 (2023); Huston \textit{e…
View article: Incommensurate antiferromagnetism in UTe2 under pressure
Incommensurate antiferromagnetism in UTe2 under pressure Open
The discovery of multiple superconducting phases in UTe2 boosted research on correlated-electron physics. This heavy-fermion paramagnet was rapidly identified as a reference compound to study the interplay between magnetism and unconventio…
View article: c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure Open
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 curr…
View article: Anisotropic signatures of electronic correlations in the electrical resistivity of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>UTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Anisotropic signatures of electronic correlations in the electrical resistivity of Open
Multiple unconventional superconducting phases are suspected to be driven by\nmagnetic fluctuations in the heavy-fermion paramagnet UTe$_2$, and a challenge\nis to identify the signatures of the electronic correlations, including the\nmagn…
View article: Possible stripe phases in the multiple magnetization plateaus in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>TbB</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:math> from single-crystal neutron diffraction under pulsed high magnetic fields
Possible stripe phases in the multiple magnetization plateaus in from single-crystal neutron diffraction under pulsed high magnetic fields Open
We present a single-crystal neutron diffraction study on the\nShastry-Sutherland lattice system TbB$_4$ at zero magnetic field and under\npulsed high magnetic fields up to 35 T applied along the crystallographic $c$\naxis. While our result…
View article: Magnetic reshuffling and feedback on superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>UTe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math> under pressure
Magnetic reshuffling and feedback on superconductivity in under pressure Open
The discovery of superconductivity in the heavy-fermion paramagnet UTe$_2$\nhas attracted a lot of attention, particularly due to the reinforcement of\nsuperconductivity near pressure- and magnetic-field-induced magnetic quantum\nphase tra…
View article: Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>UTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder compound Open
Inelastic-neutron-scattering measurements were performed on a single crystal\nof the heavy-fermion paramagnet UTe$_2$ above its superconducting temperature.\nWe confirm the presence of antiferromagnetic fluctuations with the\nincommensurat…
View article: Feedback of superconductivity on the magnetic excitation spectrum of UTe$_{2}$
Feedback of superconductivity on the magnetic excitation spectrum of UTe$_{2}$ Open
We investigate the spin dynamics in the superconducting phase of UTe$_{2}$ by triple-axis inelastic neutron scattering on a single crystal sample. At the wave-vector $\bf{k_1}$=(0, 0.57, 0), where the normal state antiferromagnetic correla…
View article: Magnetism in heavy-f-electron metals
Magnetism in heavy-f-electron metals Open
In this document, I present a personal view on the heavy-fermion problem, within a phenomenological approach guided by experiments. This review presents a set of 'historical' works which established the ground bases of the thematic during …
View article: Comparison of two superconducting phases induced by a magnetic field in UTe2
Comparison of two superconducting phases induced by a magnetic field in UTe2 Open
View article: Evidence of Fermi surface reconstruction at the metamagnetic transition of the strongly correlated superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>UTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Evidence of Fermi surface reconstruction at the metamagnetic transition of the strongly correlated superconductor Open
Thermoelectric power ($S$) and Hall effect ($R_\\mathrm{H}$) measurements on\nthe paramagnetic superconductor UTe$_2$ with magnetic field applied along the\nhard magnetization $b$-axis are reported. The first order nature of the\nmetamagne…
View article: Destabilization of hidden order in URu2Si2 under magnetic field and pressure
Destabilization of hidden order in URu2Si2 under magnetic field and pressure Open
View article: Monitoring the propagation of COVID-19-pandemic first waves
Monitoring the propagation of COVID-19-pandemic first waves Open
A phenomenological approach is proposed to monitor the propagation of the COVID-19-pandemic first waves. A large set of data collected at a worldwide scale during the first months of 2020 is compiled into series of semi-logarithmic plots, …
View article: Competing pairing interactions responsible for the large upper critical field in a stoichiometric iron-based superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CaKFe</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Competing pairing interactions responsible for the large upper critical field in a stoichiometric iron-based superconductor Open
The upper critical field of multiband superconductors is an important\nquantity that can reveal the details about the nature of the superconducting\npairing. Here we experimentally map out the complete upper critical field phase\ndiagram o…
View article: COVID-19: Monitoring the propagation of the first waves of the pandemic
COVID-19: Monitoring the propagation of the first waves of the pandemic Open
Introduction : A phenomenological approach is proposed to monitor the propagation of the first waves of the COVID-19 pandemic. Method : A large set of data collected during the first months of 2020 is compiled into a series of semi-logarit…
View article: Quenched nematic criticality and two superconducting domes in an iron-based superconductor
Quenched nematic criticality and two superconducting domes in an iron-based superconductor Open
View article: High-field moment polarization in the itinerant ferromagnet URhSi
High-field moment polarization in the itinerant ferromagnet URhSi Open
We report a high-magnetic-field study of the itinerant ferromagnet URhSi.\nMagnetization and electrical resistivity were measured under magnetic fields\n$\\mu_0H$ up to 58~T applied along the directions $\\mathbf{a}$, $\\mathbf{b}$,\nand $…
View article: Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe<sub>2</sub>
Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe<sub>2</sub> Open
We present magnetoresistivity measurements on the heavy-fermion\nsuperconductor UTe$_{2}$ in pulsed magnetic fields $\\mu_0H$ up to 68~T and\ntemperatures $T$ from 1.4 to 80~K. Magnetic fields applied along the three\ncrystallographic dire…
View article: Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure
Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure Open
The nematic electronic state and its associated nematic critical fluctuations have emerged as potential candidates for superconducting pairing in various unconventional superconductors. However, in most materials their coexistence with oth…
View article: Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition
Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition Open
View article: 40-Tesla pulsed-field cryomagnet for single crystal neutron diffraction
40-Tesla pulsed-field cryomagnet for single crystal neutron diffraction Open
We present the first long-duration and high duty cycle 40-T pulsed-field cryomagnet addressed to single crystal neutron diffraction experiments at temperatures down to 2 K. The magnet produces a horizontal field in a bi-conical geometry, ±…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0021.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi>URu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> under intense magnetic fields: From hidden order to spin-density wave
under intense magnetic fields: From hidden order to spin-density wave Open
View article: Three-dimensional critical phase diagram of the Ising antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> under intense magnetic field and pressure
Three-dimensional critical phase diagram of the Ising antiferromagnet under intense magnetic field and pressure Open
Using novel instrumentation to combine extreme conditions of intense pulsed\nmagnetic field up to 60~T and high pressure up to 4~GPa, we have established\nthe three-dimensional (3D) magnetic field - pressure - temperature phase\ndiagram of…
View article: Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx Open
We investigate the evolution of the Fermi surfaces and electronic interactions across the nematic phase transition in single crystals of FeSe1-xSx using Shubnikov-de Haas oscillations in high magnetic fields up to 45 tesla in the low tempe…
View article: Field-induced spin-density wave beyond hidden order in URu2Si2
Field-induced spin-density wave beyond hidden order in URu2Si2 Open
View article: Dichotomy between Attractive and Repulsive Tomonaga-Luttinger Liquids in Spin Ladders
Dichotomy between Attractive and Repulsive Tomonaga-Luttinger Liquids in Spin Ladders Open
We present a direct NMR method to determine whether the interactions in a Tomonaga-Luttinger liquid (TLL) state of a spin-1/2 Heisenberg antiferromagnetic ladder are attractive or repulsive. For the strong-leg spin ladder compound (C_{7}H_…
View article: Publisher’s Note: Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields [Phys. Rev. Lett.<b>115</b>, 027006 (2015)]
Publisher’s Note: Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields [Phys. Rev. Lett.<b>115</b>, 027006 (2015)] Open
Received 5 November 2015DOI:https://doi.org/10.1103/PhysRevLett.115.219902© 2015 American Physical Society