Publications de Ivan Kovacevic

Dimensional Reduction in Quantum Dipolar Antiferromagnets

Henrik Moodysson Rønnow, Martin Mansson, Ivan Kovacevic, Peter Babkevich

We report ac susceptibility, specific heat, and neutron scattering measurements on a dipolar-coupled antiferromagnet LiYbF4. For the thermal transition, the order-parameter critical exponent is found to be 0.20(1) and the specific-heat critical exponent -0 ...

2016

Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4

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

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

Amer Physical Soc2016

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

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

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

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

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)

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

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

Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4

Bastien Dalla Piazza, Julian Piatek, Stephen Paul Neithardt, Henrik Moodysson Rønnow, Ivan Kovacevic, Peter Babkevich

We present a study of the model spin-glass LiHo0.5Er0.5F4 using simultaneous ac susceptibility, magnetization, and magnetocaloric effect measurements along with small angle neutron scattering ( SANS) at sub-Kelvin temperatures. All measured bulk quantities ...

American Physical Society2014