122 iron arsenide

Crystal structure of 122-type AEFe2Pn2 superconductors, AE = alkaline earth metal (Ca, Se, etc.), Pn = pnictide (As, P, etc.)[1]

The 122 iron arsenide unconventional superconductors are part of a new class of iron-based superconductors. They form in the tetragonal I4/mmm, ThCr2Si2 type, crystal structure. The shorthand name "122" comes from their stoichiometry; the 122s have the chemical formula AEFe2Pn2, where AE stands for alkaline earth metal (Ca, Ba Sr or Eu) and Pn is pnictide (As, P, etc.).[1][2][3] These materials become superconducting under pressure and also upon doping.[4][5][6][7] The maximum superconducting transition temperature found to date is 38 K in the Ba0.6K0.4Fe2As2.[8] The microscopic description of superconductivity in the 122s is yet unclear.[9]

  1. ^ a b Hosono, H.; Tanabe, K.; Takayama-Muromachi, E.; Kageyama, H.; Yamanaka, S.; Kumakura, H.; Nohara, M.; Hiramatsu, H.; Fujitsu, S. (2015). "Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides". Science and Technology of Advanced Materials. 16 (3): 033503. arXiv:1505.02240. Bibcode:2015STAdM..16c3503H. doi:10.1088/1468-6996/16/3/033503. PMC 5099821. PMID 27877784.
  2. ^ Kreyssig, A.; Green, M. A.; Lee, Y.; Samolyuk, G. D.; Zajdel, P.; Lynn, J. W.; Bud'ko, S. L.; Torikachvili, M. S.; Ni, N.; Nandi, S.; Leão, J. B.; Poulton, S. J.; Argyriou, D. N.; Harmon, B. N.; McQueeney, R. J.; Canfield, P. C.; Goldman, A. I. (2008). "Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering". Physical Review B. 78 (18): 184517. arXiv:0807.3032. Bibcode:2008PhRvB..78r4517K. doi:10.1103/PhysRevB.78.184517. S2CID 118703521.
  3. ^ Tegel, M.; Rotter, M.; Weiß, V.; Schappacher, F. M.; Pöttgen, R.; Johrendt, D. (2008). "Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2". Journal of Physics: Condensed Matter. 20 (45): 452201. arXiv:0806.4782. Bibcode:2008JPCM...20S2201T. doi:10.1088/0953-8984/20/45/452201. S2CID 15023921.
  4. ^ Shirage, P. M.; Miyazawa, K.; Kito, H.; Eisaki, H.; Iyo, A. (2008). "Superconductivity at 26 K in (Ca1−xNax)Fe2As2". Applied Physics Express. 1 (8): 081702. Bibcode:2008APExp...1h1702M. doi:10.1143/APEX.1.081702. S2CID 94498268.
  5. ^ Park, T.; Park, E.; Lee, H.; Klimczuk, T.; Bauer, E. D.; Ronning, F.; Thompson, J. D. (2008). "Pressure-induced superconductivity in CaFe2As2". Journal of Physics: Condensed Matter. 20 (32): 322204. arXiv:0807.0800. Bibcode:2008JPCM...20F2204P. doi:10.1088/0953-8984/20/32/322204. S2CID 94568851.
  6. ^ Alireza, P. L.; Ko, Y. T. C.; Gillett, J.; Petrone, C. M.; Cole, J. M.; Lonzarich, G. G.; Sebastian, S. E. (2009). "Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures". Journal of Physics: Condensed Matter. 21 (1): 012208. arXiv:0807.1896. Bibcode:2009JPCM...21a2208A. doi:10.1088/0953-8984/21/1/012208. PMID 21817209. S2CID 206027136.
  7. ^ Anupam; Paulose, P. L.; Jeevan, H. S.; Geibel, C.; Hossain, Z. (2009). "Superconductivity and magnetism in K-doped EuFe2As2". Journal of Physics: Condensed Matter. 21 (26): 265701. arXiv:0812.1131. Bibcode:2009JPCM...21z5701A. doi:10.1088/0953-8984/21/26/265701. PMID 21828476. S2CID 18250230.
  8. ^ Rotter, M.; Tegel, M.; Johrendt, D. (2008). "Superconductivity at 38 K in the Iron Arsenide (Ba1−xKx)Fe2As2". Physical Review Letters. 101 (10): 107006. arXiv:0805.4630. Bibcode:2008PhRvL.101j7006R. doi:10.1103/PhysRevLett.101.107006. PMID 18851249. S2CID 25876149.
  9. ^ Pickett, Warren E. (2009). "Iron-based superconductors: Timing is crucial". Nature Physics. 5 (2): 87–88. Bibcode:2009NatPh...5...87P. doi:10.1038/nphys1192.