Johan Juul Chang

Cette personne n’est plus à l’EPFL

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Publications associées (25)

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

Anomalous Magnetic Excitations of Cooperative Tetrahedral Spin Clusters

Helmuth Berger, Krunoslav Prsa, Henrik Moodysson Rønnow, Joël Mesot, Johan Juul Chang

An inelastic neutron scattering study of Cu2Te2O5X2 (X=Cl, Br) shows strong dispersive modes with large energy gaps persisting far above T-N, notably in Cu2Te2O5Br2. The anomalous features: a coexisting unusually weak Goldstone-like mode observed in Cu2Te2 ...

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

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