Effect of Al doping on the optical phonon spectrum in Mg(1-x)Al(x)B(2)

Abstract

Raman and infrared absorption spectra of Mg(1-x)Al(x)B(2) have been collected for 0<x<0.5 in the spectral range of optical phonons. The x-dependence of the peak frequency, the width and the intensity of the observed Raman lines has been carefully analized. A peculiar x-dependence of the optical modes is pointed out for two different Al doping ranges. In particular the onset of the high-doping structural phase previously observed in diffraction measurements is marked by the appearence of new spectral components at high frequencies. A connection between the whole of our results and the observed suppression of superconductivity in the high doping region is established.

References in corpus (14)

• Superconductivity of metallic boron in MgB_2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity of MgB2: Covalent Bonds Driven Metallic
• Electron-phonon interaction in the normal and superconducting states of MgB2
• Phonon dispersion and electron-phonon coupling in MgB_2 and AlB_2
• Giant anharmonicity and non-linear electron-phonon coupling in MgB${}_2$; A combined first-principles calculations and neutron scattering study
• Evidence for Two Superconducting Gaps in $Mg{B}_2$
• Phonon Density-of-States in MgB2
• Tunneling spectroscopy in small grains of superconducting MgB2
• Electronic and structural properties of superconducting MgB${}_2$, CaSi${}_2$ and related compounds
• High-Resolution Photoemission Study of MgB2
• Raman spectrum and lattice parameters of MgB2 as a function of pressure
• Infrared absorption from Charge Density Waves in magnetic manganites
• Phonons in MgB2 by Polarized Raman Scattering on Single Crystals

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• Local Tunneling Study of Three-Dimensional Order Parameter in the $\pi$-band of Al-doped MgB${}_2$ Single Crystals
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• Is Delta_{pi}-gap-only superconductivity possible in Mg_{1-x}Al_{x}B_{2} and Mg(B_{1-y}C_{y})_{2} alloys?
• Enhancing long-range order in disordered two-band s-wave superconductors
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