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New Series of Nickel-Based Pnictide Oxide Superconductors (Ni2Pn2)(Sr4Sc2O6) (Pn = P, As).
- Source :
- Applied Physics Express; Jun2009, Vol. 2 Issue 6, p1-1, 1p
- Publication Year :
- 2009
-
Abstract
- We have discovered new nickel-based pnictide oxide superconductors, (Ni<subscript>2</subscript>Pn<subscript>2</subscript>)(Sr<subscript>4</subscript>Sc<subscript>2</subscript>O<subscript>6</subscript>) (Pn = P, As). These compounds have a tetragonal unit cell with a space group of P4/nmm and they consist of alternate stacking of anti-fluorite Ni<subscript>2</subscript>Pn<subscript>2</subscript> layers and K<subscript>2</subscript>NiF<subscript>4</subscript>-type Sr<subscript>4</subscript>Sc<subscript>2</subscript>O<subscript>6</subscript> blocking layers. Lattice parameters were a = 4.044 Å and c = 15.23 Å for (Ni<subscript>2</subscript>P<subscript>2</subscript>)(Sr<subscript>4</subscript>Sc<subscript>2</subscript>O<subscript>6</subscript>) and a = 4.078 Å and c = 15.41 Å for (Ni<subscript>2</subscript>As<subscript>2</subscript>)(Sr<subscript>4</subscript>Sc<subscript>2</subscript>O<subscript>6</subscript>), indicating their thicker blocking layers than that of LaNiPO (c∼8.1 Å). Both (Ni<subscript>2</subscript>P<subscript>2</subscript>)(Sr<subscript>4</subscript>Sc<subscript>2</subscript>O<subscript>6</subscript>) and (Ni<subscript>2</subscript>As<subscript>2</subscript>)(Sr<subscript>4</subscript>Sc<subscript>2</subscript>O<subscript>6</subscript>) exhibited superconductivity with zero resistivity at 3.3 and 2.7 K, respectively. The perfect diamagnetism observed in both compounds guaranteed their bulk superconductivity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18820778
- Volume :
- 2
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Applied Physics Express
- Publication Type :
- Academic Journal
- Accession number :
- 100161687
- Full Text :
- https://doi.org/10.1143/APEX.2.063007