Personal_Webpage

Dermot Coffey
Associate Professor

Science Building, Room 223

email:coffeyd@buffalostate.edu
Phone:(716)-878-5230
Fax : (716)-878-4421

Education

B.A. Trinity College, Dublin (1979)

M. Sc. University of California, Riverside (1980)

Ph. D. University of Illinois, Urbana-Chamapign (1986)

Research Interests

My area of research in theoretical condensed matter physics with an emphasis on many-body physics in strongly correlated systems.

Specific topics and selected publications:

Superconductivity and Magnetism in the Ruthenates

^{" Absence of the hyperfine magnetic field at the Ru site in ferromagnetic rare-earth intermetallics
",}^{D. Coffey, M. DeMarco, P. C. Ho, M.
B. Maple, T. Sayles, J. W. Lynn, Q. Huang, S. Toorongian
and M. Haka, Phys. Rev. B 81, 184404
(2010).}

^{" Investigation of the Mössbauer
spectrum of RuSr}₂^GdCu₂^O₈^{as a function of Temperature ",}^{D. Coffey, M. DeMarco, B. Dabrowski,
S. Kolesnik,S. Toorongian
and M. Haka, Phys. Rev. B 77, 174513
(2008).}

^{"Orbital ordering transition in La}₄^Ru₂^O₁₀^{probed with Mossbauer spectroscopy ",}^{R. Heary,
D. Coffey, M.DeMarco, P. Khalifah,
S. Tooringian and M. Haka,
Physica B 393, 78 ( 2007).}

^{"99Ru Mössbauer effect study of off-stoichiometric SrRu}_1-_n^O₃^{synthesized with different Curie temperatures",}^{M. DeMarco, D. Coffey, R. Heary, B. Dabrowski, P.Klamut, M.
Maxwell, S. Toorongian and M. Haka,
Phys. Rev. B 71, 104403 (2005).}

^{"99Ru Mössbauer effect measurements in
superconducting and magnetic RuSr}₂^GdCu₂^O₈^",^{M. DeMarco, D. Coffey, J. Tallon, M. Haka, S. Toorongian and J. Fridmann, Phys.
Rev. B 65, 212506 (2002).}

^{"Temperature dependence of the hyperfine magnetic field in SrRuO}₃^{measured by the 99Ru Mössbauer Effect",

M. DeMarco, G. Cao, J. E. Crow, D. Coffey, S. Toorongian,
M. Haka and J. Friedmann,
Phys. Rev. B 62, 14297 (2000).}

^{Superconductivity}

^{"Calculation of optical conductivity in a
two-band superconductor: Pb",}^{N. Bock and D. Coffey, Phys.
Rev. B.}^{76, 174513 (2007).}

^{"Strong Coupling Features Due to Quasiparticle
Interactions in Two-Dimensional Superconductors",}^{D. Coffey, Physica
C 305, 139 (1998).}^{"Quasiparticle
Interactions in Two- and Three-Dimensional
Superconductors",}^{D. Coffey, Europhysics
Letts. 40, 563 (1997).}^{"Quasiparticle
Interactions and Signatures of the Superconductor Order Parameter Symmetry in
Phonon Linewidths"}^{D. Coffey and L. Coffey, Phys. Rev. B. 53, 15292 (1996).}^{"Effect of the Spontaneous Decay
of Superconductor Quasiparticles in The Tunneling
Density of States",}^{D. Coffey,
J. Phys. Chem. Solids 54, 1369 (1993).}^{"Quasiparticle
Spectral Weight of Cuprate Oxide
Superconductors",}^{L. Coffey and D. Coffey, Phys. Rev. B 48, 4184 (1993).}^{"Quasiparticle
Decay Effects in the Superconducting Density of States: Evidence for d-wave
Pairing",}^{D. Coffey and L. Coffey, Phys. Rev. Lett. 70, 1529 (1993).}

^Magnetism

^{``Magnetic anisotropy in the molecular complex V}₁₅^",^{N. P. Konstantinidis and D.
Coffey, Phys. Rev. B 66, 174426 (2002).}^{``Accurate Results from Perturbation Theory for Strongly Frustrated S=1/2 Heisenberg Spin
Clusters",}^{N. P. Konstantinidis and D.
Coffey. Phys. Rev. B 63, 184436
(2001).}^{"Correlations for the S=1/2 Antiferromagnet on the Truncated Tetrahedron",}^{D. Coffey and
S. A. Trugman,}^{Phys.
Rev. B 46, 12717 (1992).}^{"Magnetic
Properties of Undoped C}₆₀^",^D.^{Coffey and S. A. Trugman,}^{Phys. Rev. Lett. 69, 176 (1992).}

^{Fermi Liquid Theory}

^{"Adiabatic and nonadiabatic
contributions to the free energy from the electron-phonon interaction for Na,
K, Al, and Pb"}^{N. Bock, Duane Wallace, and D.
Coffey, Phys. Rev. B 73, 75114
(2006).}^{``Evolution of Fermi Liquid Behavior
with doping in the Hubbard Model",}^{J. S. Kim and D. Coffey, Phys.
Rev. B 62, 4288 (2000).}^{"Single-Particle
Properties of a Two-Dimensional Fermi Liquid at Finite Frequencies and
Temperature",}^{J. S. Kim and D. Coffey, Phys.
Rev. B 57, 542 (1998).}^{"Two Dimensional Fermi Liquids
at low density: The Single-Particle Self-Energy"}^{J.S. Kim and D. Coffey, Phil. Mag. B 74, 477 (1996).}^{"Quasiparticle
Spectra and the Calculation of Thermodynamics
for a 2D Fermi Liquid",}^{D. Coffey, Phys. Rev. B 51,
14069 (1995).}^{"Non-Analytic
Contributions to the Self-Energy and the Thermodynamics of Two-Dimensional
Fermi Liquids",}^{D. Coffey and K. S. Bedell, Phys. Rev. Lett.}^{71, 1043 (1993).}