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Pressure-induced shift of the photoluminescence band in single crystals of buckminster fullerene C60 and its implications for superconductivity in doped samples

Sood, AK and Chandrabhas, N and Muthu, DVS and Jayaraman, A and Kumar, N and Krishnamurthy, HR and Pradeep, T and Rao, CNR (1992) Pressure-induced shift of the photoluminescence band in single crystals of buckminster fullerene C60 and its implications for superconductivity in doped samples. In: Solid State Communications, 18 (1). pp. 89-92.

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Abstract

We report the first observation of a large pressure-induced red-shift of the photoluminescence band in single crystals of C60 and the associated colour change of the sample from red to black at 3.2 GPa. Interpreting the red shift of the luminescence band as a reduction of the bandgap Eg of the crystal, we get the pressure derivative ∂Eg/∂P = −0.138 eV/GPa. This result taken in conjunction with the known compressibility, gives the deformation potential ∂Eg/∂(ln a) = 6.0 eV, where ‘a’ is the lattice constant. Taking the same value for the alkali-doped fullerene, and combining it with the known pressure dependence of the transition temperature in the context of a single BCS expression for Tc we estimate the electron-phonon coupling parameter - 0.3.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier Science Ltd.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 23 Jul 2004
Last Modified: 19 Sep 2010 04:13
URI: http://eprints.iisc.ernet.in/id/eprint/1012

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