Although the existence of nematic order in iron-based superconductors is now a well-
established experimental fact, its origin remains controversial. Nematic order breaks the …

Muon spin relaxation/rotation (μ SR) is a vital technique for probing the superconducting gap
structure, pairing symmetry and time reversal symmetry breaking, enabling an …

We investigate how emergent nematic order and nematic fluctuations affect several
macroscopic properties of both the normal and superconducting states of the iron pnictides …

In several families of iron-based superconducting materials, ad-wave pairing instability may
compete with the leading s-wave instability. Here, we show that when both states have …

The multiband nature of iron pnictides gives rise to a rich temperature-doping phase
diagram of competing orders and a plethora of collective phenomena. At low dopings, the …

Unconventional superconductivity often intertwines with various forms of order, such as the
nematic order which breaks the rotational symmetry of the lattice. Here we report a scanning …

Recent experiments on two iron-pnictide families suggest the existence of a single quantum
phase transition inside the superconducting dome despite the fact that two separate …

We study superconductivity in a three-dimensional zero-density Dirac semimetal in proximity
to a ferroelectric quantum critical point. We find that the interplay of criticality, inversion …

The emergence of nematic electronic states accompanied by a structural phase transition is
a recurring theme in many correlated electron materials, including the high-temperature …

In this study, we have constructed an extended version of Ginzburg-Landau theory of
superconductivity starting from the exponential non-standard Lagrangian. An extended …