RAPID COMMUNICATIONSThe Rapid Communications section of Physical Review B is devoted to the accelerated publication of especially important new results. A Rapid Communication presents work that is important, interesting, or timely to those in a particular subfield.More about RapidsEDITORS' SUGGESTIONSpin dynamics in pressure-induced magnetically ordered phases in (C4H12N2)Cu2Cl6Organic molecular magnets like piperazinium hexachlorodicuprate (PHCC) have attracted interest due to their sensitivity to pressure which presents possibilities for pressure-induced quantum phase transitions. Previous neutron and muon studies of PHCC gave differing indications of how the spin gap in this material varied with applied pressure. The authors of this work have resolved this discrepancy by further neutron scattering results showing that the spin gap has dissipated completely by 9 kbar, in agreement with the previous muon data. The authors also present a model in which the results are explained by the weakening of a single exchange pathway.G. Perren et al.Phys. Rev. B 92, 054413 (2015)EDITORS' SUGGESTIONTopological magnetoelectric effects in thin films of topological insulatorsThe authors describe two theoretical setups that could be used to demonstrate the yet unobserved topological magnetoelectric effect. The first proposal employs the zero-filling quantum Hall effect in thin films under magnetic field. The second setup involves topological insulator thin films doped with two magnetic ions such as Cr and Mn.Takahiro Morimoto, Akira Furusaki, and Naoto NagaosaPhys. Rev. B 92, 085113 (2015)EDITORS' SUGGESTIONNeutron-scattering-based evidence for interacting magnetic excitons in LaCoO3For several decades LaCoO3 attracted interest due the unconventional thermally-driven spin-state crossover from a nonmagnetic to paramagnetic state. More recently, it was realized that the nonmagnetic ground state harbors some form of magnetism that is likely due to local magnetic entities forming at oxygen vacancies. Such entities dubbed magnetic excitons were predicted in 1996, with some evidence for their existence emerging around 2005 from muon spin relaxation. In this Rapid Communication the authors provide the first scattering-based evidence for spin excitons, direct information on the size and density of the excitons, as well as their interactions. The form of the scattering is also direct proof of a bulk 3D ensemble of these excitons.S. El-Khatib et al.