2009/04/30 by Yutaka Matsumura, Hiraku Ogino, Shigeru Horii +3
Materials Science · Physics and Astronomy · #Diamagnetism #Electrical resistivity and conductivity #Iron-based superconductors research #Oxide #Physics of Superconductivity and Magnetism #Pnictogen #Stacking #Superconductivity #Superconductivity in MgB2 and Alloys #Tetragonal crystal system #cond-mat.supr-con
paper · pdf · doi:10.1143/apex.2.063007
published as Appl. Phys. Express 2 (2009) 063007 · 4 pages, 3 figures, 1 table
openalex publication_date 2009/06/05 · arxiv created 2009/06/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have discovered new nickel-based pnictide oxide superconductors, (Ni 2 Pn 2 )(Sr 4 Sc 2 O 6 ) ( Pn = P, As). These compounds have a tetragonal unit cell with a space group of P 4/ n m m and they consist of alternate stacking of anti-fluorite Ni 2 Pn 2 layers and K 2 NiF 4 -type Sr 4 Sc 2 O 6 blocking layers. Lattice parameters were a = 4.044 Å and c = 15.23 Å for (Ni 2 P 2 )(Sr 4 Sc 2 O 6 ) and a = 4.078 Å and c = 15.41 Å for (Ni 2 As 2 )(Sr 4 Sc 2 O 6 ), indicating their thicker blocking layers than that of LaNiPO ( c ∼8.1 Å). Both (Ni 2 P 2 )(Sr 4 Sc 2 O 6 ) and (Ni 2 As 2 )(Sr 4 Sc 2 O 6 ) exhibited superconductivity with zero resistivity at 3.3 and 2.7 K, respectively. The perfect diamagnetism observed in both compounds guaranteed their bulk superconductivity.