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Papers by ramiro severino

Research paper thumbnail of Ginzburg-Landau approach to the vortex–domain wall interaction in superconductors with nematic order

Physical review. B./Physical review. B, Mar 18, 2024

Research paper thumbnail of A Ginzburg-Landau approach to the vortex-domain wall interaction in superconductors with nematic order

arXiv (Cornell University), Jan 11, 2024

Research paper thumbnail of Vortices in a Ginzburg Landau Theory of Superconductors with Nematic Order

In this work we explore the interplay between superconductivity and nematicity in the framework o... more In this work we explore the interplay between superconductivity and nematicity in the framework of a Ginzburg Landau theory with a nematic order parameter coupled to the superconductor order parameter, often used in the description of superconductivity of Fe based materials. In particular, we focus on the study of the vortex-vortex interaction in order to determine the way nematicity affects its attractive or repulsive character. To do so, we use a dynamical method based on the solutions of the Time Dependent Ginzburg Landau equations in a bulk superconductor. An important contribution of our work is the implementation of a pseudo-spectral method to solve the dynamics, known to be highly efficient and of very high order in comparison to the usual finite differences/elements methods. The coupling between the superconductor and the (real) nematic order parameters is represented by two terms in the free energy: a biquadratic term and a coupling of the nematic order parameter to the covariant derivatives of the superconductor order parameter. Our results show that there is a competing effect: while the former independently of its competitive or cooperative character generates an attractive vortex-vortex interaction, the latter always generates a repulsive interaction.

Research paper thumbnail of Ginzburg-Landau approach to the vortex–domain wall interaction in superconductors with nematic order

Physical review. B./Physical review. B, Mar 18, 2024

Research paper thumbnail of A Ginzburg-Landau approach to the vortex-domain wall interaction in superconductors with nematic order

arXiv (Cornell University), Jan 11, 2024

Research paper thumbnail of Vortices in a Ginzburg Landau Theory of Superconductors with Nematic Order

In this work we explore the interplay between superconductivity and nematicity in the framework o... more In this work we explore the interplay between superconductivity and nematicity in the framework of a Ginzburg Landau theory with a nematic order parameter coupled to the superconductor order parameter, often used in the description of superconductivity of Fe based materials. In particular, we focus on the study of the vortex-vortex interaction in order to determine the way nematicity affects its attractive or repulsive character. To do so, we use a dynamical method based on the solutions of the Time Dependent Ginzburg Landau equations in a bulk superconductor. An important contribution of our work is the implementation of a pseudo-spectral method to solve the dynamics, known to be highly efficient and of very high order in comparison to the usual finite differences/elements methods. The coupling between the superconductor and the (real) nematic order parameters is represented by two terms in the free energy: a biquadratic term and a coupling of the nematic order parameter to the covariant derivatives of the superconductor order parameter. Our results show that there is a competing effect: while the former independently of its competitive or cooperative character generates an attractive vortex-vortex interaction, the latter always generates a repulsive interaction.

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