The undoped β-FeSe is the simplest iron-based superconductor but with the diverse properties. It has a critical temperature (Tc) of 8 K at normal pressure, and 36.7 K under high pressure and by means of intercalation. The combination of both intercalation and pressure results in re-emerging superconductivity at 48 (see and references therein).
What are iron-based superconductors?
Iron-based superconductors ( FeSC) are iron -containing chemical compounds whose superconducting properties were discovered in 2006. In 2008, led by recently discovered iron pnictide compounds (originally known as oxypnictides ), they were in the first stages of experimentation and implementation.
Is Al-42622(Pn) a superconductor?
Al-42622 (Pn) exhibit superconductivity for both Pn = As and P with the transition temperatures of 28.3 K and 17.1 K, respectively. The a-lattice parameters of Al-42622 (Pn) (a = 3.713 Å and 3.692 Å for Pn = As and P, respectively) are smallest among the iron-pnictide superconductors.
Is superconductivity reemerging at 48?
The combination of both intercalation and pressure results in re-emerging superconductivity at 48 (see and references therein). A subset of iron-based superconductors with properties similar to the oxypnictides, known as the 122 iron arsenides, attracted attention in 2008 due to their relative ease of synthesis.
What are the physical properties of superconductivity?
The onset of superconductivity is accompanied by abrupt changes in various physical properties, which is the hallmark of a phase transition. For example, the electronic heat capacity is proportional to the temperature in the normal (non-superconducting) regime.
When does a superconducting material cease to be superconductive?
Similarly, at a fixed temperature below the critical temperature, superconducting materials cease to superconduct when an external magnetic field is applied which is greater than the critical magnetic field.
