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Caputo M, Di Santo G, Parisse P, Petaccia L, Floreano L, Verdini A, Panighel M, Struzzi C, Taleatu B, Lal C, Goldoni A. Experimental Study of Pristine and Alkali Metal Doped Picene Layers: Confirmation of the Insulating Phase in Multilayer Doped Compounds. THE JOURNAL OF PHYSICAL CHEMISTRY C 2012. [DOI: 10.1021/jp306640z] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Caputo
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
| | - G. Di Santo
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
- Department of Physics, Trieste University, Via Valerio 2, 34127 Trieste, Italy
| | - P. Parisse
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
| | - L. Petaccia
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
| | - L. Floreano
- Lab. TASC, IOM-CNR, s.s.
14 km 163.5 in Area Science Park, 34149 Trieste, Italy
| | - A. Verdini
- Lab. TASC, IOM-CNR, s.s.
14 km 163.5 in Area Science Park, 34149 Trieste, Italy
| | - M. Panighel
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
- Department of Physics, Trieste University, Via Valerio 2, 34127 Trieste, Italy
| | - C. Struzzi
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
| | - B. Taleatu
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
- Department of Physics, Obafemi Awolowo University Ile-Ife, Nigeria
| | - C. Lal
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
- Centre for Non-Conventional
Energy Resources, University of Rajasthan, Jaipur, India
| | - A. Goldoni
- ST-INSTM Lab., Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area
Science Park, 34149 Trieste, Italy
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Macovez R, Goldoni A, Petaccia L, Marenne I, Brühwiler PA, Rudolf P. Reversible phase transformation and doubly charged anions at the surface of simple cubic RbC60. PHYSICAL REVIEW LETTERS 2008; 101:236403. [PMID: 19113572 DOI: 10.1103/physrevlett.101.236403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2008] [Indexed: 05/27/2023]
Abstract
The simple cubic phase of a RbC60 thin film has been studied using photoelectron spectroscopy. The simple cubic-to-dimer transition is found to be reversible at the film surface. A sharp Fermi edge is observed and a lower limit of 0.5 eV is found for the surface Hubbard U, pointing to a strongly correlated metallic character of thin-film simple cubic RbC60. A molecular charge state is identified in the valence band and core-level photoemission spectra which arises from C60(2-) anions and contributes to the spectral intensity at the Fermi level.
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Affiliation(s)
- Roberto Macovez
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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Wang Y, Yamachika R, Wachowiak A, Grobis M, Khoo KH, Lee DH, Louie SG, Crommie MF. Novel orientational ordering and reentrant metallicity in K(x)C(60) monolayers for 3 < or = x < or = 5. PHYSICAL REVIEW LETTERS 2007; 99:086402. [PMID: 17930964 DOI: 10.1103/physrevlett.99.086402] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2006] [Indexed: 05/25/2023]
Abstract
STM studies on K(x)C(60) monolayers reveal new behavior over a wide range of the phase diagram. As x increases from 3 to 5 K(x)C(60) monolayers undergo metal-insulator-metal reentrant phase transitions and exhibit a variety of novel orientational orderings, including a complex 7-molecule, pinwheel-like structure. The proposed driving mechanism for the orientational ordering is the lowering of electron kinetic energy by maximizing the overlap of neighboring molecular orbitals. In insulating (metallic) K(x)C(60) this gives rise to orbital versions of the superexchange (double-exchange) interaction.
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Affiliation(s)
- Yayu Wang
- Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720-7300, USA
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Yang WL, Brouet V, Zhou XJ, Choi HJ, Louie SG, Cohen ML, Kellar SA, Bogdanov PV, Lanzara A, Goldoni A, Parmigiani F, Hussain Z, Shen ZX. Band structure and Fermi surface of electron-doped C60 monolayers. Science 2003; 300:303-7. [PMID: 12690192 DOI: 10.1126/science.1082174] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
C60 fullerides are challenging systems because both the electron-phonon and electron-electron interactions are large on the energy scale of the expected narrow band width. We report angle-resolved photoemission data on the band dispersion for an alkali-doped C60 monolayer and a detailed comparison with theory. Compared to the maximum bare theoretical band width of 170 meV, the observed 100-meV dispersion is within the range of renormalization by electron-phonon coupling. This dispersion is only a fraction of the integrated peak width, revealing the importance of many-body effects. Additionally, measurements on the Fermi surface indicate the robustness of the Luttinger theorem even for materials with strong interactions.
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Affiliation(s)
- W L Yang
- Advanced Light Source (ALS), Materials Science Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA
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