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Influence of flexoelectric coupling on domain patterns in ferroelectrics

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Magnetic phase diagram of Ca-substituted EuFe2As2

The simultaneous presence of an Fe-related spin-density wave and the antiferromagnetic order of Eu-2(+) moments ranks EuFe2As2 among the most interesting parent compounds of iron-based pnictide superconductors. Here we explore the consequences of the dilut ...

AMER PHYSICAL SOC2018

Tunable spin polarization and superconductivity in engineered oxide interfaces

Stefano Rusponi

Advances in growth technology of oxide materials allow single atomic layer control of heterostructures. In particular delta doping, a key materials' engineering tool in today's semiconductor technology, is now also available for oxides. Here we show that a ...

Nature Publishing Group2016

Probing Entangled States of the Nuclear-Electronic Quantum Magnet LiHoF₄

Ivan Kovacevic

Two objects are entangled when their quantum mechanical wavefunctions cannot be written in a separable product form. Entangling dissimilar quantum objects, or hybridization, has been suggested as a promising route to efficient quantum information processor ...

EPFL2016

Monocrystalline PZT thin films

Mahamudu Mtebwa

"More with less" has been the motto behind the hardware miniaturization trend in the microelectronics industry since the 1970s. Active research in the growth of oxide films, including ferroelectrics, which started soon after, followed the same trend. Meanw ...

EPFL2015

Interacting spin-1 bosons in a two-dimensional optical lattice

We study, using quantum Monte Carlo (QMC) simulations, the ground state properties of spin-1 bosons trapped in a square optical lattice. The phase diagram is characterized by the mobility of the particles (Mott insulating or superfluid phase) and by their ...

Amer Physical Soc2013

Phase diagram with an enhanced spin-glass region of the mixed Ising–XY magnet LiHoxEr1-xF4

Henrik Moodysson Rønnow, Ivica Zivkovic, Bastien Dalla Piazza, Julian Piatek, Neda Nikseresht Ghanepour, Nikolay Tsyrulin

We present the experimental phase diagram of LiHoxEr1-xF4, a dilution series of dipolar-coupled model magnets. The phase diagram was determined using a combination of ac susceptibility and neutron scattering. Three unique phases in addition to the Ising fe ...

Amer Physical Soc2013

Strain-Induced Ferromagnetism in Antiferromagnetic LuMnO3 Thin Films

Jonathan White

Single phase and strained LuMnO3 thin films are discovered to display coexisting ferromagnetic and antiferromagnetic orders. A large moment ferromagnetism (approximate to 1 mu(B)), which is absent in bulk samples, is shown to display a magnetic moment dist ...

American Physical Society2013

Structural phase transitions and electronic phenomena at 180-degree domain walls in rhombohedral BaTiO3

Nava Setter, Alexander Tagantsev, Petr Yudin

The structure and electronic phenomena at the 180-degree domain wall in the rhombohedral phase of BaTiO3 are described using Landau-Ginzburg-Devonshire theory. Dependent on the wall orientation, two types of domain wall behaviors are identified. The low-en ...

American Physical Society2013

Berry phase investigation of spin-S ladders

Frédéric Mila, Natalia Chepiga, Frédéric Alexis Michaud

We investigate the properties of antiferromagnetic spin-S ladders with the help of local Berry phases defined by imposing a twist on one or a few local bonds. In gapped systems with time-reversal symmetry, these Berry phases are quantized, hence able in pr ...

2013

Structural and Magnetic Dynamics of a Laser Induced Phase Transition in FeRh

Paul Beaud

We use time-resolved x-ray diffraction and magneto-optical Kerr effect to study the laser-induced antiferromagnetic to ferromagnetic phase transition in FeRh. The structural response is given by the nucleation of independent ferromagnetic domains (tau(1) s ...

American Physical Society2012