Published April 2010 | Version v1
Journal article Metadata-only

Superconductivity in a new iron pnictide oxide (Fe2As2)(Sr4(Mg, Ti)2O6)

Creators

  • 1. Department of Applied Chemistry, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
  • 2. Magnetic Materials Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0106 (Japan)
  • 3. JST-TRIP, Sanban-cho, Chiyoda-ku, Tokyo 102-0075 (Japan)

Description

We have discovered a new iron pnictide oxide superconductor (Fe2As2)(Sr4(Mg, Ti)2O6). This material is isostructural with (Fe2As2)(Sr4M2O6) (M = Sc, Cr, V), which were found in previous studies. The structure of this compound is tetragonal with a space group of P4/nmm and consists of the anti-fluorite type FeAs layer and perovskite-type block layer. The lattice constants are a = 3.935 A and c = 15.952 A for (Fe2As2)(Sr4MgTiO6). Bulk superconductivity with a Tc(onset) of ∼ 26 K was observed for a partially Co-substituted sample. Moreover, Co-free and Ti-rich samples exhibited higher Tc(onset)s above 35 K, which were further enhanced by applying high pressures up to ∼ 43 K.

Availability note (English)

Available from http://dx.doi.org/10.1088/0953-2048/23/4/045001

Additional details

Identifiers

DOI
10.1088/0953-2048/23/4/045001;
PII
S0953-2048(10)40446-7;

Publishing Information

Journal Title
Superconductor Science and Technology
Journal Volume
23
Journal Issue
4
Journal Page Range
[5 p.]
ISSN
0953-2048
CODEN
SUSTEF

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
42057760
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
IRON; IRON ARSENIDES; OXIDES; PEROVSKITE; SUPERCONDUCTIVITY; SUPERCONDUCTORS
Descriptors DEC
ARSENIC COMPOUNDS; ARSENIDES; CHALCOGENIDES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; IRON COMPOUNDS; METALS; MINERALS; OXIDE MINERALS; OXYGEN COMPOUNDS; PEROVSKITES; PHYSICAL PROPERTIES; PNICTIDES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS