Autor: Forte, Filomena - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Topological phases emerging from spin-orbital physics
Autorzy:: Oleś, Andrzej
Brzezicki, Wojciech
Cuoco, Mario
Forte, Filomena
Opis:: We study the evolution of spin-orbital correlations in an inhomogeneous quantum system with an impurity replacing a doublon by a holon orbital degree of freedom. Spin-orbital entanglement is large when spin correlations are antiferromagnetic, while for a ferromagnetic host we obtain a chain with only orbital interactions. In this regime, the orbital model can be mapped on spinless fermions and we uncover topological phases with zero energy modes at the edge or at the domain between magnetically inequivalent regions.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Tuning crystal field potential by orbital dilution in strongly correlated d^{4} oxides
Autorzy:: Couco, Mario
Forte, Filomena
Oleś, Andrzej
Noce, Canio
Brzezicki, Wojciech
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: Spin-orbital mechanisms for negative thermal expansion in $Ca_{2}RuO_{4}$
Autorzy:: Forte, Filomena
Cuoco, Mario
Oleś, Andrzej
Noce, Canio
Brzezicki, Wojciech
Opis:: The phenomenon of negative thermal expansion (NTE) deals with the increase of the lattice parameters and the volume of the unit cell when the material is thermally cooled. The NTE is typically associated with thermal phonons and anomalous spin-lattice coupling at low temperatures. However, the underlying mechanisms in the presence of strong electron correlations in multiorbital systems are not yet fully established. Here, we investigate the role of Coulomb interaction in the presence of lattice distortions in setting out the NTE effect, by focusing on the physical case of layered Ca$_{2}$RuO$_{4}$ with the d$^{4}$ configuration at each Ru ion site. We employ the Slater-Koster parametrization to describe the electron-lattice coupling through the dependence of the d-p hybridization on the Ru-O-Ru bond angle. The evaluation of the minimum of the free energy at finite temperature by fully solving the multiorbital many-body problem on a finite-size cluster allows us to identify the regime for which the system is prone to exhibit NTE effects. The analysis shows that the nature of the spin-orbital correlations is relevant to drive the reduction of the bond angle by cooling, and in turn the tendency toward a NTE. This is confirmed by the fact that a changeover of the electronic and orbital configuration from d$^{4}$ to d$^{3}$ by transition metal substitution is shown to favor the occurrence of a NTE in Ca$_{2}$RuO$_{4}$. This finding is in agreement with the experimental observations of a NTE effect which is significantly dependent on the transition metal substitution in the Ca$_{2}$RuO$_{4}$ compound.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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