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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Superconductivity in Uncollapsed Tetragonal LaFe2As2.

Akira Iyo1, Shigeyuki Ishida1, Hiroshi Fujihisa1

  • 1National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Umezono , Tsukuba , Ibaraki 305-8568 , Japan.

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We synthesized LaFe2As2 (La122) and discovered superconductivity at 12.1 K after annealing. This transformation from a collapsed to an uncollapsed tetragonal structure is key for achieving superconductivity in this iron-based material.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Superconductivity

Background:

  • Iron-based superconductors exhibit complex phase diagrams and tunable properties.
  • The ThCr2Si2 structure type is known to host various interesting electronic properties.
  • CaFe2As2 under pressure shows structural transitions linked to superconductivity.

Purpose of the Study:

  • To synthesize and characterize ThCr2Si2-type LaFe2As2 (La122).
  • To investigate the structural and superconducting properties of La122.
  • To understand the relationship between crystal structure and superconductivity in La122.

Main Methods:

  • High-pressure synthesis at 960 °C and 3.4 GPa.
  • Annealing treatment at 500 °C to induce structural transformation.
  • X-ray diffraction to determine crystal structure and lattice parameters.
  • Superconductivity measurements to determine the critical temperature (Tc).

Main Results:

  • Synthesis of La122 with a collapsed tetragonal structure (c ≈ 11.01 Å) as-synthesized.
  • Transformation to an uncollapsed tetragonal structure (c ≈ 11.73 Å) upon annealing.
  • Emergence of superconductivity at 12.1 K in the uncollapsed tetragonal phase.
  • Absence of a specific Fermi surface feature crucial for s± wave pairing due to heavy electron doping.

Conclusions:

  • Annealing transforms La122 from a nonsuperconducting collapsed tetragonal phase to a superconducting uncollapsed tetragonal phase.
  • Superconductivity in La122 is strongly dependent on its crystal structure.
  • The observed superconductivity mechanism in La122 may share similarities with pressure-induced superconductivity in CaFe2As2.