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 Tc, the Cs133 and C13 NMR spin-lattice relaxation data are seemingly governed by a pseudogaplike feature. We prove that this feature, also seen in the Cs133 NMR 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 νQ of the Cs133 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.

Mott Transition in the A15 Phase of Cs3 C60: Absence of a Pseudogap and Charge Order / Alloul, H.; Wzietek, P.; Mito, T.; Pontiroli, Daniele; Aramini, M.; Ricco', Mauro; Itie, J. P.; Elkaim, E.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 118:23(2017), p. 237601. [10.1103/PhysRevLett.118.237601]

Mott Transition in the A15 Phase of Cs3 C60: Absence of a Pseudogap and Charge Order

PONTIROLI, Daniele;RICCO', Mauro;
2017

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 Tc, the Cs133 and C13 NMR spin-lattice relaxation data are seemingly governed by a pseudogaplike feature. We prove that this feature, also seen in the Cs133 NMR 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 νQ of the Cs133 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.
Mott Transition in the A15 Phase of Cs3 C60: Absence of a Pseudogap and Charge Order / Alloul, H.; Wzietek, P.; Mito, T.; Pontiroli, Daniele; Aramini, M.; Ricco', Mauro; Itie, J. P.; Elkaim, E.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 118:23(2017), p. 237601. [10.1103/PhysRevLett.118.237601]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2830888
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