A5029875006- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Surface and Thin Film Phenomena
- Nuclear Materials and Properties
- Superconductivity in MgB2 and Alloys
- Ga2O3 and related materials
- Inorganic Chemistry and Materials
- Thermodynamic and Structural Properties of Metals and Alloys
- Magnetic Properties of Alloys
- Magnetic properties of thin films
- MXene and MAX Phase Materials
- 2D Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Crystal Structures and Properties
- Solid-state spectroscopy and crystallography
- Electronic and Structural Properties of Oxides
- Organic and Molecular Conductors Research
Laboratoire de physique des Solides
2020-2024
Université Paris-Saclay
2020-2024
Centre National de la Recherche Scientifique
2020-2024
Université Paris-Sud
2022
Sorbonne Université
2020
Institut des NanoSciences de Paris
2020
Universität Hamburg
2016-2019
CEA Grenoble
2012-2017
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012-2017
Institut Nanosciences et Cryogénie
2012-2017
We demonstrate the artificial construction of magnetic atom chains on a conventional superconductor as Majorana platform.
Interface engineering of the Fe/Re hybrid system leads to a topological superconducting state with chiral Majorana edge modes.
We report field and temperature dependent measurements of the thermoelectric power (TEP) Nernst effect in itinerant metamagnet UCoAl. The magnetic is applied along easy magnetization $c$ axis hexagonal crystal structure. metamagnetic transition from paramagnetic phase at zero to induced ferromagnetic state first order low temperatures becomes a broad crossover above critical ${T}_{M}^{\ensuremath{\star}}\ensuremath{\sim}11\text{ }\text{ }\mathrm{K}$. dependence TEP reveals that effective...
We present thermoelectric power and resistivity measurements in the ferromagnet ${\mathrm{UGe}}_{2}$ as a function of temperature magnetic field. At low temperature, huge quantum oscillations are observed field applied along $a$ axis. The frequencies extreme orbits determined an analysis cyclotron masses is performed following different theoretical approaches for detected power. They compared to those obtained by Shubnikov--de Haas experiments on same crystal previous de Haas--van Alphen...
The pair breaking potential of individual magnetic impurities in s-wave superconductors generates localized states inside the superconducting gap commonly referred to as Yu- Shiba-Rusinov (YSR) whose isolated nature makes them ideal building blocks for artificial structures that may host Majorana fermions. One challenges this endeavor is understand their intrinsic lifetime, $\hbar/\Lambda$, which expected be limited by inelastic coupling with continuum thus leading decoherence. Here we use...
Spin-polarized scanning tunneling microscopy is used to investigate the magnetic state of Fe monolayer on Re(0001). Two coexisting atomic-scale noncollinear spin textures are observed with a sharp transition between them order atomic lattice spacing. A position correlation two states both in experiments and Monte Carlo simulations, demonstrating their coupling behavior.
We report thermoelectric measurements of the low carrier heavy fermion compound URu2Si2 at high fields up to 34T and temperatures down 500mK. The field dependence power (TEP) Nernst signal shows successive anomalies deep inside hidden order (HO) phase. position these correspond different changes in Shubnikov-de Haas frequencies effective masses around 12 T, 17 23 T 30 T. These results indicate reconstructions Fermi surface, which imply electronic phase transitions well within HO
We report quite exotic thermoelectric power $S$ in ${\mathrm{UBe}}_{13}$. At 0 T, the negative $S/T$ continues to strongly enhance down superconducting transition temperature with no Fermi-liquid behavior. $|S/T|$ is dramatically suppressed and becomes rather modest increasing field. have also obtained precise field dependencies of (i) an anomaly due Kondo effect (ii) a field-induced associated anomalous upward ${H}_{\mathrm{c}2}(T)$. In contrast field-sensitive transport property,...
The itinerant metamagnet UCoAl has been investigated by high field X-ray magnetic circular dichroism (XMCD) at the U M4,5 and Co K edges. orbital spin moments of 2.1 for H || c applied below above first order metamagnetic transition (HM) have determined. magnetism is dominated moment. There no evidence any change to moment ratio (∼−2.05) across HM within ferromagnetic phase up 17 T. possibility a Fermi surface reconstruction remains an open option. XMCD K-edge reveals presence small...
Measurements of thermoelectric power are used to show that the heavy fermion compound CeRh${}_{2}$Si${}_{2}$ has very different Fermi surfaces in portions pressure-temperature phase diagram.
Abstract Transition metal dichalcogenides (TMDs) display a rich variety of instabilities such as spin and charge orders, Ising superconductivity, topological properties. Their physical properties can be controlled by doping in electric double‐layer field‐effect transistors (FET). However, for the case single layer NbSe 2 , FET is limited to ≈ 1 × 10 14 cm −2 while somewhat larger injection obtained via deposition K atoms. Here, performing angle‐resolved photoemission spectroscopy, scanning...
The pair breaking potential of individual magnetic impurities in s-wave superconductors generates localized states inside the superconducting gap commonly referred to as Yu-Shiba-Rusinov (YSR) whose isolated nature makes them promising building blocks for artificial structures that may host Majorana fermions. One challenges this endeavor is understand their intrinsic lifetime, ℏ/Λ, which expected be limited by inelastic coupling with continuum thus leading decoherence. Here we use shot-noise...
The large quantum oscillations observed in the thermoelectric power antiferromagnetic (AF) state of heavy-fermion compound CeRh2Si2 disappear suddenly when entering polarized paramagnetic (PPM) at Hc=26.5 T, indicating an abrupt reconstruction Fermi surface. electronic band structure was [LDA+U] for AF taking correct magnetic into account, PPM state, and (PM). Different surfaces were obtained AF, PM, states. Due to folding, a number branches expected state. LDA+U calculation compared with...
Liquid free cryogenic devices are acquiring importance in basic science and engineering. But they can also lead to improvements teaching low temperature an solid state physics graduate students specialists. Most of the relatively expensive, but small sized equipment is slowly becoming available. Here, we have designed several simple experiments which be performed using a Stirling refrigerator. We discuss measurement critical current bulk YBa2Cu3O(7-d) (YBCO) sample, observation levitation...
Fourier transformation of atomically resolved STM topography (LaSe)1.14(NbSe2)revealed a surface modulation along the hexagonal lattice NbSe2 layer, but with two times larger period.We compare it to modified charge density wave found on plain under strain.
Hybrid interfaces where organic molecules are adsorbed on metallic substrates very interesting to understand the fundamental interactions that might modify chemical–physical properties of or substrate. Here, we explore adsorption manganese phthalocyanines (MnPcs) different structural phases a Pb monatomic layer, namely, √7 × √3-Pb and striped incommensurate phase (SIC-Pb) phase, grown Si(111). Surprisingly, deposition minute amount MnPc (∼0.18 molecules/100 nm2) nucleates macroscopic...
We report the evolution of thermoelectric power under hydrostatic pressure up to 17 kbar and at low temperature in heavy fermion compound CeRh2Si2. These measurements were performed using a setup specially designed for piston cylinder cells. The suppression antiferromagnetic order (AF) into paramagnetic (PM) state was studied (T, P) phase diagram precisely obtained. different magnetic transitions as function pressure, AF1-AF2 transition P'c AF1-PM Pc, show significant changes signal. This...
Understanding the interplay between individual magnetic impurities and superconductivity is crucial for bottom-up construction of novel phases matter. For decades, description by Yu, Shiba Rusinov (YSR) single spins in a superconductor its extension to include quantum effects has proven highly successful: pair-breaking potential spin generates sub-gap electron- hole excitations that are energetically equidistant from zero. By tuning energy states through zero, impurity screening makes ground...