The strength of electron electron correlation in Cs3C60
L Baldassarre1, A Perucchi2, M Mitrano3,4
1Center for Life Nano Science@Sapienza, Istituto Italiano di Tecnologia, V.le Regina Elena 291, Rome, Italy.
Scientific Reports
|October 16, 2015
Summary
Pressure transforms cesium fulleride (Cs3C60) from an antiferromagnetic insulator to a superconductor. Strong electronic correlations and Jahn-Teller effects are key to its insulating and metallic properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Cesium fulleride (Cs3C60) exhibits antiferromagnetic insulating behavior at ambient pressure.
- Superconductivity emerges under pressure (P) with a critical temperature (Tc) of 38 K, suggesting non-conventional Bardeen-Cooper-Schrieffer (BCS) pairing.
Purpose of the Study:
- Investigate the pressure-induced insulator-to-metal transition in Cs3C60.
- Understand the role of electronic correlations and Jahn-Teller effects in this transition.
Main Methods:
- Infrared spectroscopy was employed to probe the electronic properties.
- Dynamical Mean-Field Theory (DMFT) calculations supplemented the experimental data.
Main Results:
- The transition to a metallic state was observed under pressure.
- Strong electronic correlations persist across the investigated pressure range.
- The Jahn-Teller effect is enhanced during the metallization process.
Conclusions:
- Electronic correlations are fundamental to the insulating state and the 'bad metallic' nature of Cs3C60 under pressure.
- Jahn-Teller coupling remains relevant in the metallic state, indicating surviving phonon coupling alongside strong correlations.
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