Effect of hole doping and antiferromagnetic coupling on the itinerant ferromagnetism of SrRuO3 through Cu substitution at Ru site
Journal
Solid State Communications
Journal Volume
149
Journal Issue
39-40
Pages
1674-1678
Date Issued
2009
Author(s)
Abstract
Systematic studies on the structural, transport and magnetic properties of SrRu1-xCuxO3 (x = 0.0 - 0.2) compounds have been performed. SrRu0.8Cu0.2O3 shows a tetragonal structure unlike the other compositions which exhibit a pseudo-cubic structure. Low temperature powder X-ray diffraction data of SrRu0.8Cu0.2O3 collected at a synchrotron beam line reveals that the tetragonal structure is stable down to 8 K. Ferromagnetic transition temperatures (Tc) are significantly reduced from 160 to 34 K with Cu doping. All the compositions exhibit irreversibilities in MZFC(T) and MFC(T) curves ascribable to the presence of domain structures. Magnetic susceptibility measurements show that the copper ions are anti-ferromagnetically coupled for concentrations higher than x = 0.16. The antiparallel arrangement of Ru5+ ions with its neighboring cations also contributes to the large reduction in the observed magnetic moment. X-ray photoemission spectroscopy measurements show evidence for both tetravalent and pentavalent Ru ions while copper is in a divalent state. We conclude from our resistivity data that Cu2+ substitution promotes a polaronic type of conductivity. © 2009 Elsevier Ltd. All rights reserved.
SDGs
Type
journal article