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Electronic excitations with energies near the superconducting energy gap are strongly affected by superconducting transitions. The authors show, with a comprehensive optical investigation, that excitations with energies up to two orders of magnitude greater are also affected by the transition.

The interplay between magnetic and superconducting phases is important to understand the physics of iron-based superconductivity. Here, the authors use thermodynamic measurements on Ba_1−xK_xFe₂As₂ single crystals to provide details of its phase diagram and the re-entrance of a C₂spin-density-wave phase.

The pulsation spectra of intermediate-mass stars (so-called δ Scuti stars) have been challenging to analyse, but new observations of 60 such stars reveal remarkably regular sequences of high-frequency pulsation modes.

A system’s properties near a quantum phase transition scale differently than near a finite-temperature phase transition. Here, the authors identify an anomalously small dynamic scaling exponent from magnetization and specific heat measurements in the itinerant ferromagnet SrCaRuO which is at odds with current theory.

The nearby Ophiuchus star-forming region should be able to give us insight into the incorporation of short-lived radionuclides into the early Solar System. These radionuclides, such as ²⁶Al, originated from multiple sources and gently warmed the protosolar disk over an extended period. Another heating event, therefore—perhaps an FU Orionis-type outburst—presumably led to the resetting of the radiogenic clock.

The crossover between the weak-coupling limit and strong-coupling limit provides important information for quantum bound states of interacting fermions. Here, Kasahara et al. report thermodynamic evidence for prevailing phase fluctuations of superconductivity, highlighting unusual normal state in the BCS-BEC crossover regime.

Whether the electronic nematicity is related to electronic pairing in strongly hole-doped iron-based superconductors remains controversial. Here, the authors perform transport measurements on AFe₂As₂ (A = K, Rb, Cs) superconductors under elastic strain, and find no indication of a nematic ordered state.

The non-linear Meissner effect is a key manifestation of unconventional nodal superconductors but its experimental evidence has been elusive. Here, the authors observe the nonlinear Meissner effect in nodal superconductors CeCoIn₅ and LaFePO.

The origin of the charge density wave in vanadium antimonides has been widely debated. Here, the authors report the cooperation of electron-phonon and phonon-phonon coupling for the formation of the charge density wave in CsV₃Sb₅.

This paper explores the use of scanning transmission electron microscopy (STEM) to vitrified biological samples for biomolecular structure elucidation. Integrated differential phase contrast (iDPC)–STEM imaging of keyhole limpet hemocyanin and tobacco mosaic virus enabled cryo-EM structure determination at 6.5 and 3.5 Å resolution, respectively.

An exotic s + is multiband superconducting state manifests in a doped pnictide superconductor when a second band moves below the Fermi surface. This creates an internal magnetic field, breaking time-reversal symmetry.