Joël Mesot

Cette personne n’est plus à l’EPFL

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Publications associées (50)

Charge disproportionation in RNiO3 perovskites (R=rare earth) from high-resolution x-ray absorption spectroscopy

Marco Grioni, François Vernay, Joël Mesot

High-resolution x-ray absorption measurements reveal a rare-earth-dependent splitting of the Ni K edge in the insulating, charge-disproportionated state of the whole RNiO3 perovskite family. The splitting is five times larger for LuNiO3 [2.5(1) eV] than fo ...

2009

Fermi Surface and Order Parameter Driven Vortex Lattice Structure Transitions in Twin-Free YBa2Cu3O7

Joël Mesot, Jonathan White

We report on small-angle neutron scattering studies of the intrinsic vortex lattice (VL) structure in detwinned YBa2Cu3O7 at 2 K, and in fields up to 10.8 T. Because of the suppressed pinning to twin-domain boundaries, a new distorted hexagonal VL structur ...

2009

Spectroscopic evidence for preformed Cooper pairs in the pseudogap phase of cuprates

Joël Mesot, Elia Razzoli, Martin Mansson, Johan Juul Chang

Angle-resolved photoemission on underdoped La1.895Sr0.105CuO4 reveals that in the pseudogap phase, the dispersion has two branches located above and below the Fermi level with a minimum at the Fermi momentum. This is characteristic of the Bogoliubov disper ...

2009

Electronic structure of La1.48Nd0.4Sr0.12CuO4 probed by high- and low-energy angle-resolved photoelectron spectroscopy

Joël Mesot, Martin Mansson, Johan Juul Chang

We present angle-resolved photoelectron spectroscopy data probing the electronic structure of the Nd-substituted high-T-c cuprate La1.48Nd0.4Sr0.12CuO4. Data have been acquired at low and high photon energies, h nu=55 and 500 eV, respectively. The two extr ...

2009

Tuning competing orders in La2-xSrxCuO4 cuprate superconductors by the application of an external magnetic field

Henrik Moodysson Rønnow, Joël Mesot, Johan Juul Chang

We report the results of a combined muon-spin rotation and neutron-scattering study on La2-xSrxCuO4 in the vicinity of the so-called 1/8 anomaly. Application of a magnetic field drives the system toward a magnetically ordered spin-density-wave state, which ...

AMER PHYSICAL SOC2008

Electronic structure near the 1/8-anomaly in La-based cuprates

Joël Mesot, Martin Mansson, Johan Juul Chang

We report an angle-resolved photoemission study of the electronic structure of the pseudogap state in La1.48Nd0.4Sr0.12CuO4 (T-c < 7 K). Two opposite dispersing Fermi arcs are the main result of this study. Several scenarios that can explain this observati ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2008

Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped La1.895Sr0.105CuO4 superconductor

Henrik Moodysson Rønnow, Joël Mesot, Mechthild Enderle, Johan Juul Chang

High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La1.895Sr0.105CuO4 (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum transfer Q(IC)=( ...

AMERICAN PHYSICAL SOC2007

Nature of the magnetic order in the charge-ordered cuprate La1.48Nd0.4Sr0.12CuO4

Henrik Moodysson Rønnow, Joël Mesot, Mechthild Enderle

Using polarized neutron scattering we establish that the magnetic order in La1.48Nd0.4Sr0.12CuO4 is either (i) one dimensionally modulated and collinear, consistent with the stripe model or (ii) two dimensionally modulated with a novel noncollinear structu ...

AMERICAN PHYSICAL SOC2007

Incommensurate magnetic ordering in Cu2Te2O5X2 (X=Cl,Br) studied by single crystal neutron diffraction

Helmuth Berger, Henrik Moodysson Rønnow, Joël Mesot

Polarized and unpolarized neutron-diffraction studies have been carried out on single crystals of the coupled spin tetrahedra systems Cu2Te2O5X2 (X=Cl, Br). A model of the magnetic structure associated with the propagation vectors k(') (Cl) approximate to ...

2006

Incommensurate magnetism in the coupled spin tetrahedra system Cu2Te2O5Cl2

Helmuth Berger, Henrik Moodysson Rønnow, Joël Mesot

Neutron scattering studies on powder and single crystals have provided new evidence for unconventional magnetism in Cu2Te2O5Cl2. The compound is built from tetrahedral clusters of S=1/2 Cu2+ spins located on a tetragonal lattice. Magnetic ordering, emergin ...

2005

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