The pair density wave (PDW) is a superconducting state in which Cooper pairs carry centre-
of-mass momentum in equilibrium, leading to the breaking of translational symmetry …

Superconductivity (SC) and ferromagnetism (FM) are normally antagonistic, and their
coexistence in a single crystalline material appears to be very rare. Over a decade ago, the …

We report the synthesis, crystal structure, and physical properties of a quinary iron arsenide
fluoride, KCa2Fe4As4F2. The new compound crystallizes in a body-centered tetragonal …

We investigate nonreciprocal photon correlations in coupled microring resonators with
directional quantum squeezing (quantum parametric amplification). We show that the …

The recent discovery of Sr-doped infinite-layer nickelate NdNiO2 offers a new platform for
investigating unconventional superconductivity in nickelate-based compounds. Most …

In the novel stoichiometric iron-based material RbEuFe 4 As 4, superconductivity coexists
with a peculiar long-range magnetic order of Eu 4f states. Using angle-resolved …

The interplay between superconductivity and magnetism is one of the oldest enigmas in
physics. Usually, the strong exchange field of ferromagnet suppresses singlet …

Magnetic excitations and magnetic structure of EuRbFe 4 As 4 were investigated by inelastic
neutron scattering (INS), neutron diffraction, and random phase approximation (RPA) …

Superconductivity (SC) and ferromagnetism (FM) are in general antagonistic, which makes
their coexistence very rare. Following our recent discovery of robust coexistence of SC and …

We have synthesized two iron fluo-arsenides $ A $ Ca $ _2 $ Fe $ _4 $ As $ _4 $ F $ _2 $
with $ A $= Rb and Cs, analogous to the newly discovered superconductor KCa $ _2 $ Fe …