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R Zeyher

Publications and source records attributed to R Zeyher.

11 recordsLinked to original sources
PubMed2003

Raman scattering from a superconductivity-induced bound state in MgB2.

It is shown that the sharp peak in the E(2g) Raman spectrum of superconducting MgB2 is due to a bound state caused by the electron-phonon coupling. Our theory explains why this peak appears only in the spectra with E(2g) symmetry and only in the sigma but not the pi bands. The properties of the bound state and the Raman spectrum are investigated, also in the presence of impurity scattering.

Journal Article↗
PubMed2002

Influence of collective effects and the d charge-density wave on electronic raman scattering in high-T(c) superconductors.

Electronic Raman scattering in high-T(c) superconductors is studied within the t-J model. It is shown that the A(1g) and B(1g) spectra are dominated by amplitude fluctuations of the superconducting and the d charge-density-wave order parameters, respectively. The B(2g) spectrum contains no collective effects and its broad peak reflects vaguely the doping dependence of T(c), similarly to the pronounced peak in the A(1g) spectrum. The agreement of our theory with the experiment supports the picture of two different, competing order parameters in the underdoped regime of high-T(c) superconductors.

Journal Article↗