John Eldridge, Professor

B.Sc., Birmingham (1963)
Ph.D., Birmingham (1966)
Res. Assoc., Nebraska (1966--1968)
Best Condensed Matter Paper in Can J. Phys. (1981)
UBC Killam Senior Fellow (1986)

Research Interests

Infrared and Raman Studies of Solids


 Our main equipment consists of two state-of-the-art spectrometers, both manufactured by Bruker. The first is a Fourier-transform infrared spectrometer, which is an evacuable, rapid-scan interferometer, with computer-selectable sources, beam-splitters, filters, apertures and detectors to cover entire infrared region with speed and precision. Accurate reflectivity measurements from small single crystals or thin-film samples cover a wide infrared frequency range as a funcion of temperature down to 2K.
 The second spectrometer is a recently-purchased Fourier-transform Raman spectometer, which uses a Nd:YAG diode-pumped infrared laser. This infrared laser eliminates the problems of fluorescence and photodegragation so often encountered with the usual argon-ion lasers, which operate in the visible region. Since the organic superconductors are always black in appearance, these problems were always very severe, but with the new infrared-laser Raman machine we are able to use Raman spectroscopy where it was not possible before.
 Both spectrometers use the same PC computers and dedicated software, which is regularly updated.

Selected Publications

“Assignment of the Raman Spectra of some Deuterated-BEDT-TTF Superconductors”, Spectrochim. Acta A 58, 2237-2243 (2002), J.E. Eldridge, H.H. Wang, A.M. Kini, and J.A. Schlueter.

“ Raman Studies of BEDT-TTF Molecule-based Organic Superconductors”, Phys. Rev. B64, 24506-1-5 (2001), Y. Lin, J.E. Eldridge, J. Schlueter, H.H. Wang, and A.M. Kini.

" Magnetic Order in La1.9Sr0.1CuO4 from Two-Magnon Scattering", Phys. Rev. B61, 7130-7134 (2000), Y. Lin, J. Sichelschmidt, J.E. Eldridge and T. Wahlbrink.

" Frohlich-Interaction Induced One-Phonon Raman Scattering in La2CuO4 using an Infrared Laser", Solid State Comm. 112, 315-318 (1999), Y. Lin, J.E. Eldridge, J. Sichelschmidt, S.W. Cheong, and T. Wahlbrink.

"Effect of  Magnetic Fluctuations on the Raman Scattering in k-(BEDT-TTF)2[Cu(NCS)2]",  Phys. Rev. B58, R599-R602 (1998), Y. Lin, J.E. Eldridge, H.H. Wang, A.M. Kini, M.E. Kelly, J.M. Williams and J.M. Schlueter.

" Fluctuation Effects on the Raman Scattering from the Charge-Density-Wave System TTF-TCNQ", Phys. Rev. B58, 3477-3481 (1998), Y. Lin and J.E. Eldridge.

“Resonant Raman Scattering from a Charge-Density-Wave System (TTF-TCNQ)", Solid State Comm. 105, 427-431 (1998), J.E. Eldridge, Y. Lin, T.C. Mayadunne, L.K. Montgomery, S. Kaganov, and T. Mieback.

"Tc-Dependent Raman Scattering from a High-Frequency Phonon in k-(BEDT-TTF)2 Cu[N(CN)2]Br", Phys. Rev. B57, 597-601 (1998), J. E. Eldridge, Y. Lin, H.H. Wang, J.M. Williams and A.M. Kini.

“Infrared and Raman Studies of the Organic Superconductor k-(BEDT-TTF)2[Cu(NCS)2] and its 13C(4) Isotopic Analog”, Spectrochim. Acta A 53, 565-573 (1997), J.E. Eldridge, Y. Xie, Y. Lin, C.C. Homes, H.H. Wang, J.M. Williams, A.M. Kini and J.A. Schlueter.

“The Infrared Properties of Magnetron-sputtered Diamond-like Thin Films”, Thin Solid Films 280, 130-135 (1996), G.A. Clarke, Y. Xie, J.E. Eldridge and R.R. Parsons.

“Electron-Phonon Effects in the Organic Superconductor k-(BEDT-TTF)2Cu[N(CN)2]Br”, Spectrochimica Acta 52A, 45-56 (1996), J.E. Eldridge, Y. Xie, H.H. Wang, J.M. Williams, A.M. Kini and J.A. Schlueter.

"Far Infrared Magneto--Conductivity of a High-Tc Superconducting Film", Phys. Rev. B52, 4462-4466 (1995), J.E. Eldridge, M. Dressel, D.J. Matz, B. Gross, Q.Y. Ma and W.N. Hardy.

"The Assignment of the Normal Modes of the BEDT-TTF Electron-Donor Molecule using the Infrared and Raman Spectra of Several Isotopic Analogs", Spectrochimica Acta 51A, No. 6, 947-960 (1995), J.E. Eldridge, C.C. Homes, J.M. Williams, A.M. Kini and H.H. Wang.

"Characterization of GaAs/Ga1-xAlxAs Multilayer Systems by Infrared Spectroscopy at Normal Incidence", Solid State Commun. 87, 1039-1044 (1993), A. Zeng, J.E. Eldridge, C. Lavoie and T. Tiedje.

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