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

TL;DR

This study investigates the magnetic properties of V layers in Sr2VFeAsO3, revealing localized magnetic moments in V ions and their limited role in electronic conduction, contributing to understanding of magnetic ordering in this superconductor.

Contribution

It provides new insights into the magnetic behavior of V layers in Sr2VFeAsO3, showing localized moments and their decoupling from conduction electrons, which was not previously established.

Findings

V ions have localized magnetic moments.

No transport anomaly at ~150 K.

V electrons do not contribute to the Fermi surface.

Abstract

Results of transport, magnetic, thermal, and 75As-NMR measurements are presented for superconducting Sr2VFeAsO3 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 Sr2VO3-block layers have localized magnetic moments and that V-electrons do not contribute to the Fermi surface. The electronic characteristics of Sr2VFeAsO3 are considered to be common to those of other superconducting systems with Fe-pnictogen layers.