Magnetic Ordering in V-Layers of the Superconducting System of Sr2VFeAsO3

Results of transport, magnetic, thermal, and 75 As-NMR measurements are presented for superconducting Sr 2 VFeAsO 3 with an alternating stack of FeAs and perovskite-like block layers. Although apparent anomalies in magnetic and thermal properties have been observed at ∼150 K, no anomaly in transport behaviors has been observed at around the same temperature. These results indicate that V ions in the Sr 2 VO 3 -block layers have localized magnetic moments and that V-electrons do not contribute to the Fermi surface. The electronic characteristics of Sr 2 VFeAsO 3 are considered to be common to those of other superconducting systems with Fe-pnictogen layers.