Concept

Théorie du champ moléculaire

Publications associées (148)

Excitation spectrum and density matrix renormalization group iterations

We show that, in certain circumstances, exact excitation energies appear as locally site-independent (or flat) modes if one records the excitation spectrum of the effective Hamiltonian while sweeping through the lattice in the variational matrix-product-st ...

2017

Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4

Henrik Moodysson Rønnow, Peter Babkevich, Bastien Dalla Piazza, Julian Piatek, Neda Nikseresht Ghanepour, Conradin Kraemer, Ivan Kovacevic

We present a systematic study of the phase diagram of LiHoxY1-xF4 (0.25

Amer Physical Soc2016

Mean-Field Description of Plastic Flow in Amorphous Solids

Matthieu Wyart, Jie Lin

Failure and flow of amorphous materials are central to various phenomena including earthquakes and landslides. There is accumulating evidence that the yielding transition between a flowing and an arrested phase is a critical phenomenon, but the associated ...

American Physical Society2016

Probing strongly hybridized nuclear-electronic states in a model quantum ferromagnet

Henrik Moodysson Rønnow, Giovanni Boero, Peter Babkevich, Julian Piatek, Ivan Kovacevic

We present direct local-probe evidence for strongly hybridized nuclear-electronic spin states of an Ising ferromagnet LiHoF4 in a transverse magnetic field. The nuclear-electronic states are addressed via a magnetic resonance in the GHz frequency range usi ...

2016

Mean field modelling of dynamic and post-dynamic recrystallization during hot deformation of Inconel 718 in the absence of δ phase particles

Roland Logé

Dynamic and post-dynamic recrystallization kinetics were investigated during hot-working of Inconel 718 as a function of temperature,strain and strain rate in the single phase domain.The post-dynamic evolution was found to be extremely fast and impacting s ...

Elsevier2016

Spontaneous dimerization, critical lines, and short-range correlations in a frustrated spin-1 chain

Frédéric Mila, Natalia Chepiga

We report on a detailed investigation of the spin-1 J1−J2−J3 Heisenberg model, a frustrated model with nearest-neighbor coupling J1, next-nearest neighbor coupling J2, and a three-site interaction J3[(Si−1⋅Si)(Si⋅Si+1)+H.c.] previously studied in [Phys. Re ...

2016

Upper critical field, pressure-dependent superconductivity and electronic anisotropy of Sm4Fe2As2Te1-xO4-yFy

László Forró, Richard Gaal, Bálint Náfrádi, Janusz Andrzej Karpinski, Andrea Pisoni, Sergiy Katrych, Péter Szirmai

We present a detailed study of the electrical transport properties of a recently discovered iron-based superconductor: Sm4Fe2As2Te0.72O2.8F1.2. We followed the temperature dependence of the upper critical field by resistivity measurement of single crystals ...

Iop Publishing Ltd2016

Comment on “Frustration and multicriticality in the antiferromagnetic spin-1 chain”

Frédéric Mila, Natalia Chepiga

The phase diagram of the spin-1 chain with bilinear-biquadratic and next-nearest-neighbor interactions, recently investigated by Pixley, Shashi, and Nevidomskyy [Phys. Rev. B 90, 214426 (2014)], has been revisited in the light of results we have recently o ...

2016

On Polynomial Lieb–Robinson Bounds for the XY Chain in a Decaying Random Field

Marius Christopher Lemm

We consider the isotropic XY quantum spin chain in a random external field in the z direction, with single site distributions given by i.i.d. random variables times the critical decaying envelope j−1/2. Our motivation is the study of many-body localization ...

2016

Single crystals of superconducting SmFeAsOHx: Structure and properties

László Forró, Alla Arakcheeva, Richard Gaal, Janusz Andrzej Karpinski, Andrea Pisoni, Sergiy Katrych, Ping Huang, Péter Krisztián Matus

We report the synthesis, structure, and superconducting properties of single crystals of SmFeAsOHx. The crystals were grown at high pressure and high temperature using a cubic anvil technique. H-1-NMR studies confirm the presence of H atoms in the samples. ...

Amer Physical Soc2016

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