Dermot Coffey
Associate Professor


Science Building, Room 223
    Fax : (716)-878-4421



 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 RuSr2GdCu2O8 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 La4Ru2O10 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 SrRu1-nO3 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 RuSr2GdCu2O8",
 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 SrRuO3 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).



"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).



``Magnetic anisotropy in the molecular complex V15",
 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 C60 ",
  Coffey and S. A. Trugman,    Phys. Rev. Lett69, 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).