The strength of electron electron correlation in Cs3C60

被引：10

作者：

Baldassarre, L. ^{[1
]}

Perucchi, A. ^{[2
]}

Mitrano, M. ^{[3
,4
]}

Nicoletti, D. ^{[3
,4
]}

Marini, C. ^{[5
]}

Pontiroli, D. ^{[6
]}

Mazzani, M. ^{[6
]}

Aramini, M. ^{[6
]}

Ricco, M. ^{[6
]}

Giovannetti, G. ^{[7
,8
]}

Capone, M. ^{[7
,8
]}

Lupi, S. ^{[9
,10
]}

机构：

[1] Ist Italiano Tecnol, Ctr Life Nano Sci Sapienza, Rome, Italy

[2] INSTM Udr Trieste ST & Elettra Sincrotrone Triete, Trieste, Italy

[3] Max Planck Inst Struct & Dynam Matter, D-22761 Hamburg, Germany

[4] Ctr Free Electron Laser Sci CFEL, D-22761 Hamburg, Germany

[5] CELLS ALBA, Cerdanyola Del Valles 08290, Spain

[6] Univ Parma, Dipartimento Fis & Sci Terra, I-43100 Parma, Italy

[7] CNR IOM Democritos Natl Simulat Ctr, Trieste, Italy

[8] Int Sch Adv Studies SISSA, Trieste, Italy

[9] Univ Roma La Sapienza, CNR IOM, I-00185 Rome, Italy

[10] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

关键词：

INSULATOR-TRANSITION; SUPERCONDUCTIVITY; FULLERIDES; STATE; PHASE;

D O I：

10.1038/srep15240

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：7

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