Zobrazeno 1 - 10
of 320
pro vyhledávání: '"Wzietek, P."'
Autor:
Alloul, H., Wzietek, P., Mito, T., Pontiroli, D., Aramini, M., Riccò, M., Itié, J. P., Elkaim, E.
Publikováno v:
Phys. Rev. Lett. 118, 237601 (2017)
We present a detailed NMR study of the insulator to metal transition induced by an applied pressure $p$ in the A15 phase of Cs$_{3}$C$_{60}$. We evidence that the insulating antiferromagnetic (AF) and superconducting (SC) phases only coexist in a nar
Externí odkaz:
http://arxiv.org/abs/1610.00513
Autor:
Wzietek, P.
A general expression is derived for the dipolar NMR spin-lattice relaxation rate $1/T_1$ of a system exhibiting Brownian dynamics in a discrete and finite configuration space. It is shown that this approach can be particularly useful to model the pro
Externí odkaz:
http://arxiv.org/abs/1507.01419
Autor:
Alloul, Henri, Ihara, Yoshihiko, Mito, Takeshi, Wzietek, Pawel, Aramini, Matteo, Pontiroli, Daniele, Ricco, Mauro
Publikováno v:
Journal of Physics: Conference Series 449 (2013) 012030
The discovery in 1991 of high temperature superconductivity (SC) in A3C60 compounds, where A is an alkali ion, has been initially ascribed to a BCS mechanism, with a weak incidence of electron correlations. However various experimental evidences take
Externí odkaz:
http://arxiv.org/abs/1310.6969
Publikováno v:
Phys. Rev. Lett. 112, 066401 (2014)
Former extensive studies of superconductivity in the \textit{A}$_{3}$C$_{60}$ compounds, where \textit{A} is an alkali, have led to consider that Bardeen Cooper Schrieffer (BCS) electron-phonon pairing prevails in those compounds, though the incidenc
Externí odkaz:
http://arxiv.org/abs/1310.5529
Autor:
Rodolakis, F., Rueff, J. -P., Sikora, M., Alliot, I., Itié, J. -P., Baudelet, F., Ravy, S., Wzietek, P., Hansmann, P., Toschi, A., Haverkort, M. W., Sangiovanni, G., Held, K., Metcalf, P., Marsi, M.
Publikováno v:
Phys. Rev. B 84, 245113 (2011)
V2O3 is an archetypal system for the study of correlation induced, Mott-Hubbard metal-insulator transitions. Despite decades of extensive investigations, the accurate description of its electronic properties remains an open problem in the physics of
Externí odkaz:
http://arxiv.org/abs/1110.4397
Autor:
Kiss, A., Palyi, A., Ihara, Y., Wzietek, P., Alloul, H., Simon, P., Zolyomi, V., Koltai, J., Kurti, J., Dora, B., Simon, F.
Publikováno v:
Phys. Rev. Lett. 107, 187204 (2011)
Recent transport measurements [Churchill \textit{et al.} Nat. Phys. \textbf{5}, 321 (2009)] found a surprisingly large, 2-3 orders of magnitude larger than usual $^{13}$C hyperfine coupling (HFC) in $^{13}$C enriched single-wall carbon nanotubes (SWC
Externí odkaz:
http://arxiv.org/abs/1106.1557
Publikováno v:
EPL 94, (2011) 37007
We present here ^{13}C and ^{133}Cs NMR spin lattice relaxation T_{1} data in the A15 and fcc-Cs_{3}C_{60} phases for increasing hydrostatic pressure through the transition at p_{c} from a Mott insulator to a superconductor. We evidence that for p>>
Externí odkaz:
http://arxiv.org/abs/1102.5693
We have performed sound velocity measurements in (V$_{1-x}$Cr$_x$)$_2$O$_3$ in the vicinity of the critical point of the first order Mott transition line. The pressure sweeps at constant temperature reveal a large dip in the $c_{33}$ compression modu
Externí odkaz:
http://arxiv.org/abs/1012.0515
Autor:
Ihara, Yoshihiko, Alloul, Henri, Wzietek, Pawel, Pointiroli, Daniel, Mazzani, Marcello, Riccó, Mauro
Publikováno v:
Phys. Rev. Lett. 104 256402 (2010)
We report an NMR and magnetometry study on the expanded intercalated fulleride Cs_3C_60 in both its A15 and face centered cubic structures. NMR allowed us to evidence that both exhibit a first-order Mott transition to a superconducting (SC) state, oc
Externí odkaz:
http://arxiv.org/abs/1003.2937
Autor:
Rodolakis, F., Hansmann, P., Rueff, J. -P., Toschi, A., Haverkort, M. W., Sangiovanni, G., Tanaka, A., Saha-Dasgupta, T., Andersen, O. K., Held, K., Sikora, M., Alliot, I., Itié, J. -P., Baudelet, F., Wzietek, P., Metcalf, P., Marsi, M.
Publikováno v:
Phys. Rev. Lett. 104, 047401 (2010)
The changes in the electronic structure of V2O3 across the metal-insulator transition induced by temperature, doping and pressure are identified using high resolution x-ray absorption spectroscopy at the V pre K-edge. Contrary to what has been taken
Externí odkaz:
http://arxiv.org/abs/1001.0477