The strength of electron electron correlation in Cs3C60

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Baldassarre , L , Perucchi , A , Mitrano , M , Nicoletti , D , Marini , C , Pontiroli , D , Mazzani , M , Aramini , M , Ricco , M , Giovannetti , G , Capone , M & Lupi , S 2015 , ' The strength of electron electron correlation in Cs3C60 ' Scientific Reports , vol. 5 , 15240 . DOI: 10.1038/srep15240

Title: The strength of electron electron correlation in Cs3C60
Author: Baldassarre, L.; Perucchi, A.; Mitrano, M.; Nicoletti, D.; Marini, C.; Pontiroli, D.; Mazzani, M.; Aramini, M.; Ricco, M.; Giovannetti, G.; Capone, M.; Lupi, S.
Contributor: University of Helsinki, Materials Physics
Date: 2015-10-15
Language: eng
Number of pages: 7
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/175350
Abstract: Cs3C60 is an antiferromagnetic insulator that under pressure (P) becomes metallic and superconducting below T-c = 38 K. The superconducting dome present in the T - P phase diagram close to a magnetic state reminds what found in superconducting cuprates and pnictides, strongly suggesting that superconductivity is not of the conventional Bardeen-Cooper-Schrieffer (BCS) type We investigate the insulator to metal transition induced by pressure in Cs3C60 by means of infrared spectroscopy supplemented by Dynamical Mean-Field Theory calculations. The insulating compound is driven towards a metallic-like behaviour, while strong correlations survive in the investigated pressure range. The metallization process is accompanied by an enhancement of the Jahn-Teller effect. This shows that electronic correlations are crucial in determining the insulating behaviour at ambient pressure and the bad metallic nature for increasing pressure. On the other hand, the relevance of the Jahn-Teller coupling in the metallic state confirms that phonon coupling survives in the presence of strong correlations.
Subject: INSULATOR-TRANSITION
SUPERCONDUCTIVITY
FULLERIDES
STATE
PHASE
C-60
114 Physical sciences
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