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Open Access Publications from the University of California

Scholarly Works (4 results)

  • Article
  • Peer Reviewed
UC Davis Previously Published Works (2004)

Motivated by the geometry of spins in the materials SrCu2O3 and CaCu2O3, we study a two-layer, spin-half Heisenberg model, with nearest-neighbor exchange couplings J and alphaJ along the two axes in the plane and a coupling J(perpendicular to) perpendicular to the planes. We study these class of models using the stochastic series expansion quantum Monte Carlo simulations at finite temperatures and series expansion methods at T=0. The critical value of the interlayer coupling, J(perpendicular to)(c), separating the Neel ordered and disordered ground states, is found to follow very closely a square root dependence on alpha. Both T=0 and finite-temperature properties of the model are presented and the contrasting behavior of SrCu2O3 and CaCu2O3 are explained.

    Cover page: Criticality in coupled quantum spin chains with competing ladderlike and two-dimensional couplings: Contrasting SrCu2O3 with CaCu2O3
    • Article
    • Peer Reviewed
    UC Irvine Previously Published Works (2005)
      Cover page: Spatio-temporal fluorescence fluctuation analysis of paxillin-EGFP in cellular adhesions using scanning FCS, ICS and PCHCreative Commons 'BY' version 4.0 license
      • Article
      • Peer Reviewed
      UC Irvine Previously Published Works (2005)
        Cover page: The GPI-anchored Urokinase Receptor (uPAR) dynamics on the cells surface followed by fluorescence fluctuation spectroscopy.Creative Commons 'BY' version 4.0 license
        • Article
        • Peer Reviewed
        UC Irvine Previously Published Works (2010)
        We report specific heat (C) and magnetization (M) of single crystalline Ce4 Pt12 Sn25 at temperature down to ∼50 mK and in fields up to 3 T. C/T exhibits a sharp anomaly at 180 mK, with a large ΔC/T∼30 J/molCe K2, which, together with the corresponding cusplike magnetization anomaly, indicates an antiferromagnetic (AFM) ground state with a Néel temperature TN =180 mK. Numerical calculations based on a Heisenberg model reproduce both zero-field C and M data, thus placing Ce 4 Pt12 Sn25 in the weak exchange coupling J< Jc limit of the Doniach diagram, with a very small Kondo scale TK TN. Magnetic field suppresses the AFM state at H⊃ ≈0.7 T, much more effectively than expected from the Heisenberg model, indicating additional effects possibly due to frustration or residual Kondo screening. © 2010 The American Physical Society.
          Cover page: Thermal and magnetic properties of the low-temperature antiferromagnet Ce4 Pt12 Sn25Creative Commons 'BY' version 4.0 license
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