Erratum: Dynamic Multiferroicity of a Ferroelectric Quantum Critical Point [Phys. Rev. Lett. 122, 057208 (2019)].

This corrects the article DOI: 10.1103/PhysRevLett.122.057208.

Dynamic Multiferroicity of a Ferroelectric Quantum Critical Point.

Quantum matter hosts a large variety of phases, some coexisting, some competing; when two or more orders occur together, they are often entangled and cannot be separated. Dynamical multiferroicity, where fluctuations of electric dipoles lead to magnetization, is an example where the two orders are impossible to disentangle. Here we demonstrate an elevated magnetic response of a ferroelectric near the ferroelectric quantum critical point (FE QCP), since magnetic fluctuations are entangled with ferroelectric fluctuations. We thus suggest that any ferroelectric quantum critical point is an inherent multiferroic quantum critical point. We calculate the magnetic susceptibility near the FE QCP and find a region with enhanced magnetic signatures near the FE QCP and controlled by the tuning parameter of the ferroelectric phase. The effect is small but observable-we propose quantum paraelectric strontium titanate as a candidate material where the magnitude of the induced magnetic moments can be ∼5×10^{-7} µ_{B} per unit cell near the FE QCP.

Lightly doped La2-xSrxCuO4 as a Lifshitz helimagnet.

We study the static magnetic correlations in lightly doped La2-xSrxCuO4 within the framework of a dipolar frustration model for a canted antiferromagnet. We show that the stability of the canted Néel state for x < 2% is due to the Dzyaloshinskii-Moriya and XY anisotropies. For higher doping, the ground state is unstable towards a helicoidal magnetic phase, where the transverse components of the staggered magnetization rotate in a plane perpendicular to the orthorhombic b axis. Our theory reconciles, for the first time, the incommensurate peaks observed in elastic neutron scattering with Raman and magnetic susceptibility experiments in La2-xSrxCuO4 .

Dynamics of topological defects in a spiral: a scenario for the spin-glass phase of cuprates.

We propose that the dissipative dynamics of topological defects in a spiral state is responsible for the transport properties in the spin-glass phase of cuprates. Using the collective-coordinate method, we show that topological defects are coupled to a bath of magnetic excitations. By integrating out the bath degrees of freedom, we find that the dynamical properties of the topological defects are dissipative. The calculated damping matrix is related to the in-plane resistivity, which exhibits an anisotropy and linear temperature dependence in agreement with experimental data.

[Pathogenic and clinical differences between stasis and chronic bronchitis]. / Patogenetske i klinicke razlike izmedu zastojnog i kronicnog bronhitisa.

There is often a misguide of chronic bronchitis and passive pulmonary hypertension. In 42 patients with chronic bronchitis a revision of the results was made and it was found that in 28 (67%) patients the former diagnosis of chronic bronchitis was confirmed, while in 8 (19%) patients a new diagnosis was established--a passive pulmonary hypertension and in 6 (14%) patients a combination of chronic bronchitis and passive pulmonary hypertension was found. It is considered that the symptoms like cough, sputum and dyspnea as well as the similar physical finding may lead the clinician to change the diagnoses.