We speculate that the normal Landau theory developed for 2nd order phase transition may not adequately account for the physics of the phase transitions and associated phenomena, for example, magneto-volume effect due to lattice anharmonicity in Fe pnictide superconductors.
Most significantly, our model predicted correctly the range of values of magnetic moment of Fe, in Fe pnictide superconductors.
This observation confirms our earlier assertion that spin mediated fluctuations may be the major dominant mediator in the superconductivity of Fe pnictide superconductors.
Petit, "Pressure-induced valence transitions in rare earth chalcogenides and pnictides," Physica Status Solidi (b), vol.
Leger, "Chalcogenides and pnictides of cerium and uranium under high pressure," Physica B: Condensed Matter, vol.
Approaching the critical temperature for creation the tetragonal structure appears to be an important factor in the superconductivity of pnictides (Kamihara et al., 2008, Matsuishi et al., 2008; Imamura et al., 2012).
It has been reported that superconductors containing iron (pnictides) require lower temperatures than cuprates (Kamihara et al., 2008).
"Our finding of a quantum critical point in iron pnictides opens the door for new avenues of research into this important class of materials," said University of Tennessee/ORNL physicist Pengcheng Dai, a neutron scattering specialist.
According to Si, "The evidence from this study bolsters the hypothesis that high-temperature superconductivity in the iron pnictides originates from electronic magnetism.
Fifteen additional contributions follow discussing parity mixing, superconductivity, quantum spin-orbit correlation in crystals, Dirac fermions in cuprates and graphenes, magnetism of iron pnictides
, liquid crystals, bilayer quantum Hall systems, bird flocking as an example of self-organization, pairing behavior in the unitary Fermi gas, crackling noise, growing length scales, dynamics of semiconductor nanocrystals, polycrystal plasticity, molecular beam epitaxy, and dislocation theory.
Ishizaka et al., "Orbital-independent superconducting gaps in iron pnictides
," Science, vol.