David Belanger

About

David Belanger is a Professor Emeritus in the Physics Department at UC Santa Cruz, affiliated with the Division of Physical & Biological Sciences. His primary office is located in the Interdisciplinary Sciences Building 245. As a research professor, he has contributed to the field of physics through his academic and research activities. Further details about his specific research focus or key contributions are not provided in the available page text.

Research topics

• Materials science
• Computer Science
• Machine Learning
• Physics
• Anatomy
• Algorithm
• Medicine
• Quantum mechanics
• Condensed matter physics

Selected publications

• Local Structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>CoO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Determined from EXAFS and Neutron Pair Distribution Function Studies

  Physical Review Letters · 2009-01-13 · 73 citations

  article

  The combined local structure techniques, extended x-ray absorption fine structure and neutron pair distribution function analysis, have been used for temperatures $4\ensuremath{\le}T\ensuremath{\le}330\text{ }\text{ }\mathrm{K}$ to rule out a large Jahn-Teller (JT) distortion of the Co-O bond in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ for a significant fraction of Co sites ($x\ensuremath{\le}0.35$), indicating few, if any, JT-active, singly occupied ${e}_{g}$ Co sit…

  PublisherDOI

• Study of the local distortions of the perovskite system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>La</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Sr</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>CoO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>0</mml:mn><mml:mo>≤</mml:mo><mml:mi>x</mml:mi><mml:mo>≤</mml:mo><mml:mn>0.35</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>using the extended x-ray absorption fine structure technique

  Physical Review B · 2009-10-26 · 51 citations

  article

  We present a temperature-dependent extended x-ray absorption fine structure (EXAFS)/x-ray absorption near edge structure (XANES) investigation of ${\text{La}}_{1\ensuremath{-}x}{\text{Sr}}_{x}{\text{CoO}}_{3}$ (LSCO) over a wide doping concentration range $(0\ensuremath{\le}x\ensuremath{\le}0.35)$. Five of the samples are nanoparticles ($x=0.15$, 0.20, 0.25, 0.30, and 0.35) and four are bulk powders ($x=0$, 0.15, 0.20, and 0.30). From the EXAFS analysis, we find that the Co-O bonds are well orde…

  PublisherDOI

• Magnetism and phase transitions in LaCoO₃

  Journal of Physics Condensed Matter · 2013-08-30 · 41 citations

  article

  Neutron scattering and magnetometry measurements have been used to study phase transitions in LaCoO3 (LCO). For H ≤ 100 Oe, evidence for a ferromagnetic (FM) transition is observed at Tc ≈ 87 K. For 1 kOe ≤ H ≤ 60 kOe, no transition is apparent. For all H, Curie-Weiss analysis shows predominantly antiferromagnetic (AFM) interactions for T > Tc, but the lack of long-range AFM order indicates magnetic frustration. We argue that the weak ferromagnetism in bulk LCO is induced by lattice strain, as i…

  PublisherDOI

• The effects of Co₃O₄on the structure and unusual magnetism of LaCoO₃

  Journal of Physics Condensed Matter · 2015-03-09 · 12 citations

  articleOpen access

  Bulk La(w)CoO(3) particles with w = 1.1, 1.0, 0.9, 0.8, and 0.7 were synthesized using starting materials with varying molar ratios of La(2)O(3) and Co(3)O(4). The resulting particles are characterized as LaCoO(3) crystals interfaced with a crystalline Co(3)O(4) phase. X-ray and neutron scattering data show little effect on the average structure and lattice parameters of the LaCoO(3) phase resulting from the Co(3)O(4) content, but magnetization data indicate that the amount of Co(3)O(4) strongly…

  PublisherOA PDFDOI

• Magnetic vacancy percolation in dilute antiferromagnets

  Physical Review B · 2004-01-21 · 11 citations

  article

  Neutron-scattering experiments at the magnetic vacancy percolation threshold concentration ${x}_{v},$ using the random-field Ising crystal ${\mathrm{Fe}}_{0.76}{\mathrm{Zn}}_{0.24}{\mathrm{F}}_{2},$ show stability of the transition to long-range order up to fields $H=6.5\mathrm{T}.$ The observation of the stable long-range order corroborates the sharp boundary observed in computer simulations at ${x}_{v}$ separating equilibrium critical scattering behavior at high magnetic concentration from low…

  PublisherDOI

Frequent coauthors

• A. R. King

  31 shared

• V. Jaccarino

  University of California, Santa Barbara

  30 shared

• J. A. Fernandez‐Baca

  Oak Ridge National Laboratory

  22 shared

• Feng Ye

  Oak Ridge National Laboratory

  13 shared

• Z. Slanič

  University of California, Santa Cruz

  13 shared

• H. Yoshizawa

  The University of Tokyo

  12 shared

• David Lederman

  9 shared

• S-J. Han

  University of California, Santa Cruz

  7 shared

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