Mott Transition in the A15 Phase of Cs3C60 : Absence of a Pseudogap and Charge Order

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Alloul , H , Wzietek , P , Mito , T , Pontiroli , D , Aramini , M , Ricco , M , Itie , J P & Elkaim , E 2017 , ' Mott Transition in the A15 Phase of Cs3C60 : Absence of a Pseudogap and Charge Order ' , Physical Review Letters , vol. 118 , no. 23 , 237601 . https://doi.org/10.1103/PhysRevLett.118.237601

Title: Mott Transition in the A15 Phase of Cs3C60 : Absence of a Pseudogap and Charge Order
Author: Alloul, H.; Wzietek, P.; Mito, T.; Pontiroli, D.; Aramini, M.; Ricco, M.; Itie, J. P.; Elkaim, E.
Contributor: University of Helsinki, Department of Physics
Date: 2017-06-05
Language: eng
Number of pages: 5
Belongs to series: Physical Review Letters
ISSN: 0031-9007
URI: http://hdl.handle.net/10138/195065
Abstract: We present a detailed NMR study of the insulator-to-metal transition induced by an applied pressure p in the A15 phase of Cs3C60. We evidence that the insulating antiferromagnetic (AFM) and superconducting (SC) phases coexist only in a narrow p range. At fixed p, in the metallic state above the SC transition T-c, the Cs-133 and C-13 NMR spin-lattice relaxation data are seemingly governed by a pseudogaplike feature. We prove that this feature, also seen in the (CsNMR)-Cs-133 shift data, is rather a signature of the Mott transition which broadens and smears out progressively for increasing (p,T). The analysis of the variation of the quadrupole splitting nu(Q) of the Cs-133 NMR spectrum precludes any cell symmetry change at the Mott transition and only monitors a weak variation of the lattice parameter. These results open an opportunity to consider theoretically the Mott transition in a multiorbital three-dimensional system well beyond its critical point.
Subject: SUPERCONDUCTOR CS3C60
WIDOM LINE
STATE
PRESSURE
BEHAVIOR
SYSTEM
V2O3
114 Physical sciences
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