30 Result(s)

Article

Experimental realization of long-distance entanglement between spins in antiferromagnetic quantum spin chains

Entanglement is a concept that has defied common sense since the discovery of quantum mechanics. Two particles are said to be entangled when the quantum state of each particle cannot be described independently...

S. Sahling, G. Remenyi, C. Paulsen, P. Monceau, V. Saligrama, C. Marin… in Nature Physics (2015)

Article

Transitions and Spin Dynamics at Very Low Temperature in the Pyrochlores Yb₂Ti₂O₇ and Gd₂Sn₂O₇

The very low temperature properties of two pyrochlore compounds, Yb₂Ti₂O₇ and Gd₂Sn₂O₇, were investigated using an ensemble of microscopic and bulk techniques. In both compounds, a first order transition is evide...

P. Bonville, J. A. Hodges, E. Bertin, J.-Ph. Bouchaud… in Hyperfine Interactions (2004)

Chapter and Conference Paper

Transitions and Spin Dynamics at Very Low Temperature in the Pyrochlores Yb₂Ti₂O₇ and Gd₂Sn₂O₇

The very low temperature properties of two pyrochlore compounds, Yb₂Ti₂O₇ and Gd₂Sn₂O₇, were investigated using an ensemble of microscopic and bulk techniques. In both compounds, a first order transition is evide...

P. Bonville, J. A. Hodges, E. Bertin, J.-P. Bouchaud, P. Dalmas de Réotier… in ICAME 2003 (2004)

Chapter

Magnetic Resonance Peak and Nonmagnetic Impurities

Nonmagnetic Zn impurities are known to strongly suppress superconductivity. We review their effects on the spin excitation spectrum in YB_a2Cu₃O₇, as investigated by inelastic neutron scattering measurements.

Y. Sidis, P. Bourges, B. Keimer… in Open Problems in Strongly Correlated Elect… (2001)

Chapter

Magnetized States of Quantum Spin Chains

Quantum spin chains display complex cooperative phenomena that can be explored in considerable detail through theory, numerical simulations, and experiments. Here we review neutron scattering experiments that ...

C. Broholm, G. Aeppli, Y. Chen, D. C. Dender, M. Enderle… in High Magnetic Fields (2001)

Article

A Critical Examination of the Spin Dynamics in High-Tc Cuprates

A critical examination of the spin dynamics in high-T _c cuprates is made in the light of recent inelastic neutron scattering results obtained by different groups. The neutron data show that incommensurate magneti...

Ph. Bourges, B. Keimer, L. P. Regnault, Y. Sidis in Journal of Superconductivity (2000)

Article

Neutron scattering from magnetic excitations in Bi₂Sr₂CaCu₂O_8+δ

Many of the physical properties of the copper oxide high-temperature superconductors appear to defy the conventional ‘one-electron’ theory of metals. The development of alternative theories incorporating stron...

H. F. Fong, P. Bourges, Y. Sidis, L. P. Regnault, A. Ivanov, G. D. Gu… in Nature (1999)

Chapter

Phase Diagrams and Spin Correlations in YBa₂Cu₃O_6+x

Since the first discovery in 1986 by J.G. Bednorz and K.A. Müller [1] of a superconductivity at about 30 K in the cuprate (La,Ba)₂CuO₄, a incredible amount of work has been carried out in order to establish and u...

L. P. Regnault, Ph. Bourges, P. Burlet in Neutron Scattering in Layered Copper-Oxide… (1998)

Article

Magnetic Correlations in Ce_0.925La_0.075Ru₂Si₂

Inelastic neutron scattering experiments were performed to study the spin dynamics of the heavy fermion compound Ce_0.925La_0.075Ru₂Si₂. This composition corresponds to the borderline of the magnetic-non magnetic t...

S. Raymond, L. P. Regnault, S. Kambe, J. M. Mignot… in Journal of Low Temperature Physics (1997)

Article

Magnetic correlations in Ce_0.925La_0.075Ru₂Si₂

Inelastic neutron scattering experiments were performed to study the spin dynamics of the heavy fermion compound Ce_0,925La_0.075Ru₂Si₂. This composition corresponds to the borderline of the magnetic-non magnetic t...

S. Raymond, L. P. Regnault, S. Kambe, J. M. Mignot… in Journal of Low Temperature Physics (1997)

Article

Spin dynamics by inelastic neutron scattering in YBCO

Key features of Inelastic neutron scattering experiments in YBCO-based cuprates are discussed. We underline the importance of precise oxygen content determination in samples having similar T_C as well as the resol...

P. Bourges, L. P. Regnault, Y. Sidis, J. Bossy… in Journal of Low Temperature Physics (1996)

Article

X-Ray and neutron scattering studies of YBa₂Cu₃O_6+x compounds: Oxygen insertion and spin dynamics

In the first part of this paper the results of X-ray and neutron diffraction studies of the structural aspects related to oxygen insertion in the CuO _x planes of YBa₂Cu₃O_6+x co...

P. Burlet, P. Bourges, J. Bossy, E. Elkaim, J. Y. Henry… in Journal of Superconductivity (1996)

Article

Charge and spin gaps in Kondo-insulator CeNiSn

Charge and spin gaps in CeNiSn have been studied as a function of T and H by the tunneling effect and inelastic neutron scattering measurements. A field induced crossover from a insulating to a heavy fermion s...

S. Kambe, S. Raymond, H. Suderow, G. Lapertot, H. Bioud… in Czechoslovak Journal of Physics (1996)

Article

Magnetic excitations of CsFeCl₃ in an external magnetic field parallel to the hexagonal plane

In CsFeCl₃ the Fe²⁺-ion with effective spin one has locally a singlet ground state (m _s =0). The ferromagnetic interactions along thec-direction and the anti-ferromagnetic inter...

B. Schmid, B. Dorner, D. Petitgrand… in Zeitschrift für Physik B Condensed Matter (1994)

Chapter and Conference Paper

Neutron Scattering Investigation of the Spin Dynamics in the High-Temperature Superconducting System YBa₂Cu₃0_6+x

We report on inelastic neutron scattering experiments carried out on single-crystals of the YBa₂Cu₃O_6+x system. The spin dynamics has been successfully investigated as a function of temperature in the metallic st...

J. Rossat-Mignod, L. P. Regnault, P. Bourges… in Electronic Properties of High-T_c Supercond… (1993)

Article

Excitations in liquid⁴He beyond the roton

The dynamic structure factor S(Q,E) for liquid⁴He at saturated vapor pressure has been measured by inelastic neutron scattering for wave vectors Q between 1.9 and 2.8 Å⁻¹. The temperature dependence is studied fo...

B. Fåk, L. P. Regnault, J. Bossy in Journal of Low Temperature Physics (1992)

Chapter and Conference Paper

Free vortices in the quasi-two dimensional XY antiferromagnet BaNl2(PO₄)₂?

P. Gaveau, J. P. Boucher, A. Bouvet… in Nonlinear Coherent Structures in Physics a… (1991)

Chapter and Conference Paper

Inelastic Neutron Scattering Study of Spin Dynamics in YBa₂Cu₃O_6+x

The recent results of extensive neutron scattering studies of the spin dynamics in YBa₂Cu₃O_6+x single crystals are reviewed. In the antiferromagnetic region (x=0.15) the spin waves spectrum shows that YBa₂Cu₃O_6+x

C. Vettier, P. Burlet, L. P. Regnault… in Advances in Superconductivity III (1991)