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Title: Transport properties of β-Ga{sub 2}O{sub 3} nanoparticles embedded in Nb thin films

The origin of ferromagnetism in nanoparticles of nonmagnetic oxides is an interesting area of research. In the present work, transport properties of niobium thin films, with β-Ga{sub 2}O{sub 3} nanoparticles embedded within them, are presented. Nanoparticles of β-Ga{sub 2}O{sub 3} embedded in a Nb matrix were prepared at room temperature by radio frequency co-sputtering technique on Si (100) and glass substrates held at room temperature. The thin films deposited on Si substrates were subjected to Ar annealing at a temperature range of 600-650 C for 1 hour. Films were characterized by X-ray diffraction (XRD), Micro-Raman and elemental identification was performed with an Energy Dispersive X-ray Spectroscopy (EDS). Transport measurements were performed down to liquid helium temperatures by four-probe contact technique, showed characteristics analogous to those observed in the context of a Kondo system. A comparison of the experimental data with the theoretical formalism of Kondo and Hamann is presented. It is suggested that this behavior arises from the existence of magnetic moments associated with the oxygen vacancy defects in the nanoparticles of the nonmagnetic oxide Ga{sub 2}O{sub 3}.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam (India)
  2. Water and Steam Chemistry Division, Bhabha Atomic Research Centre Facilities, Kalpakkam (India)
  3. Microscopy and Thermo-Physical Property Division, Indira Gandhi Centre for Atomic Research, Kalpakkam (India)
Publication Date:
OSTI Identifier:
22454434
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 1; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANNEALING; COMPARATIVE EVALUATIONS; DEPOSITS; FERROMAGNETISM; GALLIUM OXIDES; LIQUIDS; MAGNETIC MOMENTS; NANOPARTICLES; OXYGEN; SPUTTERING; SUBSTRATES; THIN FILMS; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY