Diamagnetism

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Physics
Condensed matter physics
Phase transitions

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J1-J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4

Helmuth Berger, László Forró, Henrik Moodysson Rønnow, Lin Yang, Arnaud Magrez, Peter Babkevich, Oleg Yazyev, Noore Elahi Shaik, Ivica Zivkovic, Bálint Náfrádi

We report magnetic and thermodynamic properties of a 4d1 (Mo5+) magnetic insulator MoOPO4 single crystal, which realizes a J1−J2 Heisenberg spin-1/2 model on a stacked square lattice. The specific-heat measurements show a magnetic transition at 16 K which ...

Amer Physical Soc2017

A path to stable low-torque plasma operation in ITER with test blanket modules

Holger Reimerdes

New experiments in the low-torque ITER Q = 10 scenario on DIII-D demonstrate that n = 1 magnetic fields from a single row of ex-vessel control coils enable operation at ITER performance metrics in the presence of applied non-axisymmetric magnetic fields fr ...

IOP Publishing Ltd2017

Neutron spectroscopy in the layered quantum magnet SrCu₂(BO₃)₂ and in transition metal phosphorus trisulfides (MPS₃)

Diane Virginie Marie Lançon

Collective magnetic excitations are a fascinating aspect of condensed matter physics, where neutron scattering can provide valuable insight into the magnetic properties of physical realisations of model systems. This thesis focuses on the excitation spectr ...

EPFL2017

Terahertz-induced demagnetization in ferromagnets

Christoph Peter Hauri, Mostafa Shalaby

We experimentally demonstrate ultrafast terahertz induced demagnetization in conducting ferromagnets, Ni, Co, and Fe. At even higher excitation fluence, the materials lose their magnetic properties and then get damaged before magnetic switching takes place ...

Ieee2016

MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO

Henrik Moodysson Rønnow, Arnaud Magrez, Diane Virginie Marie Lançon, Ping Huang, Goran Nilsen

We show that the observed ferromagnetic behavior of ZnO lightly doped with Mn coincides with the presence of MnO nanoparticles, whereas cluster-free Mn doped ZnO behaves paramagnetically. This conclusion is reached by a study of the structural and magnetic ...

2016

Polaron response dominated multiferroic property in 12R-type hexagonal Ba(Ti1/3Mn2/3)O3-delta ceramics

Xiankui Wei

We report the multiferroic properties of 12R-type hexagonal Ba(Ti1/3Mn2/3)O3-delta found in Mn-doped BaTiO3 series samples. Hysteresis measurements reveal the coexistence of weak ferromagnetism and ferroelectricity at room temperature. Furthermore, frequen ...

Amer Inst Physics2015

Magnetic structure of the quasi-two-dimensional antiferromagnet NiPS3

Diane Virginie Marie Lançon

The magnetic structure of the quasi-two-dimensional antiferromagnet NiPS3 has been determined by magnetometry and a variety of neutron diffraction techniques. The experiments show that the samples must be carefully handled, as gluing influences the magneto ...

American Physical Society2015

Stability of Tokamak and RFP Plasmas with an Extended Region of Low Magnetic Shear

Daniele Brunetti

It has been observed experimentally that magnetically confined plasmas, characterised by the safety factor q with a small or slightly inverted magnetic shear, have good confinement properties. Such plasmas typically have no internal transport barrier, oper ...

EPFL2015

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