Transport properties of alkali metal doped fullerides

Journal Article · Fri Jul 31 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4926722· OSTI ID:22488675

Yadav, Daluram; Yadav, Nishchhal ^[1]

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1. School of studies in Physics, Vikram University, Ujjain (M.P) India (India)

We have studied the intercage interactions between the adjacent C{sub 60} cages and expansion of lattice due to the intercalation of alkali atoms based on the spring model to estimate phonon frequencies from the dynamical matrix for the intermolecular alkali-C{sub 60} phonons. We considered a two-peak model for the phonon density of states to investigate the nature of electron pairing mechanism for superconducting state in fullerides. Coulomb repulsive parameter and the electron phonon coupling strength are obtained within the random phase approximation. Transition temperature, T{sub c}, is obtained in a situation when the free electrons in lowest molecular orbital are coupled with alkali-C{sub 60} phonons as 5 K, which is much lower as compared to reported T{sub c} (20 K). The superconducting pairing is mainly driven by the high frequency intramolecular phonons and their effects enhance it to 22 K. The importance of the present study, the pressure effect and normal state transport properties are calculated within the same model leading superconductivity.

• OSTI ID: 22488675
• Journal Information: AIP Conference Proceedings, Vol. 1670, Issue 1; Conference: EIPT-2015: International conference on emerging interfaces of plasma science and technology, Ujjain (India), 9-10 Mar 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METALS
ATOMS
CLATHRATES
COMPARATIVE EVALUATIONS
DENSITY OF STATES
DOPED MATERIALS
ELECTRON-PHONON COUPLING
ELECTRONS
EXPANSION
FULLERENES
MOLECULAR ORBITAL METHOD
PHONONS
RANDOM PHASE APPROXIMATION
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE