Pressure-induced superconductivity

Cs3C60 is an insulating material which under pressure, becomes a superconductor with Tc= 38 K. Infrared spectroscopy highlights the importance of electronic correlations
in shaping the unique properties of this compound

L. Baldassarre et al., Scientific Reports 5, 15240 (2015)



The superconducting dome present in the T-P phase diagram of C3C60, 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. Our results show that  electronic correlations are crucial in determining the insulating behaviour at ambient pressure and the bad metallic nature for increasing pressure. The relevance of the Jahn-Teller effect in the metallic state confirms that phonon coupling survives in the presence of strong correlations.

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The strength of electron-electron correlation in Cs3C60
L. Baldassarre et al., Scientific Reports 5, 15240 (2015)
 

 

 

Ultima modifica il Venerdì, 10 Febbraio 2017 12:28