Publications by Bastien Dalla Piazza

Staggered flux state for rectangular-lattice spin-1/2 Heisenberg antiferromagnets

Henrik Moodysson Rønnow, Dmitri Ivanov, Bastien Dalla Piazza, Noore Elahi Shaik

We investigate the spin-1/2 Heisenberg model on a rectangular lattice, using the Gutzwiller projected variational wave function known as the staggered flux state. Using Monte Carlo techniques, the variational parameters and instantaneous spin-spin correlat ...

AMER PHYSICAL SOC2020

Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R = Gd, Ho, Er, Tm, and Yb)

Henrik Moodysson Rønnow, Peter Babkevich, Bastien Dalla Piazza, Conradin Kraemer, Ivan Kovacevic

We present a systematic study of the crystal-field interactions in the LiRF4 (R = Gd, Ho, Er, Tm, and Yb) family of rare-earth magnets. Using detailed inelastic neutron scattering measurements, we have been able to quantify the transition energies and wave ...

American Physical Society2015

Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14

László Forró, Henrik Moodysson Rønnow, Arnaud Magrez, Alla Arakcheeva, Lin Yang, Ana Akrap, Krunoslav Prsa, Andrea Pisoni, Sergiy Katrych, Bastien Dalla Piazza, Jacim Jacimovic

The novel iridate Ba8Al2IrO14 was prepared as single crystals by self-flux method, thereby providing a rare example of an all-Ir(VI) compound that can be synthesized under ambient pressure conditions. The preparation of all-Ir6+ iridate without using tradi ...

2015

Spin-orbit-induced orbital excitations in Sr2RuO4 and Ca2RuO4: A resonant inelastic x-ray scattering study

Henrik Moodysson Rønnow, Marco Grioni, Thorsten Schmitt, Christian Rüegg, Johan Juul Chang, Bastien Dalla Piazza, Sara Fatale, Noore Elahi Shaik, Claudia Giuseppina Fatuzzo, Sándor Tóth

High-resolution resonant inelastic x-ray scattering (RIXS) at the oxygen K edge has been used to study the orbital excitations of Ca2RuO4 and Sr2RuO4. In combination with linear dichroism x-ray absorption spectroscopy, the ruthenium 4d-orbital occupation a ...

Amer Physical Soc2015

Fractional excitations in the square-lattice quantum antiferromagnet

Henrik Moodysson Rønnow, Dmitri Ivanov, Bastien Dalla Piazza, Goran Nilsen, Martin Mourigal, Mechthild Enderle

Quantum magnets have occupied the fertile ground between many-body theory and low-temperature experiments on real materials since the early days of quantum mechanics. However, our understanding of even deceptively simple systems of interacting spin-1/2 par ...

Nature Publishing Group2015

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in La2CuO4

Henrik Moodysson Rønnow, Sandrine Gerber, Bruce Normand, Bastien Dalla Piazza, Vera Irina Schnells, Kazimierz Conder

We study the zero-point and thermal ionic motion in La2CuO4 by means of high-resolution neutron-diffraction experiments. Our results demonstrate anisotropic motion of O and, to a lesser extent, Cu ions, both consistent with the structure of coupled CuO6 oc ...

2014

The electronic structure of the high-symmetry perovskite iridate Ba2IrO4

Henrik Moodysson Rønnow, Marco Grioni, Johan Juul Chang, Luca Moreschini, Simon Karl Moser, Bastien Dalla Piazza

We report angle-resolved photoemission (ARPES) measurements, density functional and model tight-binding calculations on Ba2IrO4 (Ba-214), an antiferromagnetic (T-N = 230 K) insulator. Ba-214 does not exhibit the rotational distortion of the IrO6 octahedra ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2014

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Bastien Dalla Piazza

Staggered flux state for rectangular-lattice spin-1/2 Heisenberg antiferromagnets

Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4

Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R = Gd, Ho, Er, Tm, and Yb)

Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14

Spin-orbit-induced orbital excitations in Sr2RuO4 and Ca2RuO4: A resonant inelastic x-ray scattering study

Fractional excitations in the square-lattice quantum antiferromagnet

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in La2CuO4

The electronic structure of the high-symmetry perovskite iridate Ba2IrO4

Theories of Experimentally Observed Excitation Spectra of Square Lattice Antiferromagnets

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Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14

Staggered flux state for rectangular-lattice spin-1/2 Heisenberg antiferromagnets

Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R = Gd, Ho, Er, Tm, and Yb)

Spin-orbit-induced orbital excitations in Sr2RuO4 and Ca2RuO4: A resonant inelastic x-ray scattering study

Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4

Fractional excitations in the square-lattice quantum antiferromagnet

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in La2CuO4

Theories of Experimentally Observed Excitation Spectra of Square Lattice Antiferromagnets

The electronic structure of the high-symmetry perovskite iridate Ba2IrO4