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Effect of hole doping and antiferromagnetic coupling on the itinerant ferromagnetism of through Cu substitution at Ru site
Authors:R Nithya  V Sankara Sastry  Pinaki Paul  TC Han  JG Lin  FC Chou  
Institution:1. Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan;2. Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India;3. Corrosion Science & Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India;4. Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan;5. National Synchrotron Radiation Research Center, HsinChu 30076, Taiwan;1. Key Laboratory of In-fiber Integrated Optics, Ministry of Education of China, Harbin Engineering University, Harbin 150001, China;2. College of Science, Harbin Engineering University, Harbin 150001, China;3. Postdoctoral Research Station of Mechanical Engineering, College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China;1. School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People?s Republic of China;2. The High Pressure Research Center of Science and Technology, Zhengzhou University of Light Industry, Zhengzhou 450002, People?s Republic of China;1. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China;2. High Magnetic Field Laboratory, Chinese Academy of Science, Hefei 230031, Anhui, China;1. Instituto de Ciencia de Materiales de Madrid, C.S.I.C., Cantoblanco E-28049, Madrid 28049, Spain;2. Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain;3. Institut Laue Langevin, BP 156X, Grenoble F-38042, France
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.
Keywords:A  Itinerant ferromagnet  D  Magnetic susceptibility  D  Irreversibilities
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