Magnetic properties of PrCu$_2$ at high pressure (2008)
Sacchetti, A., Weller, M., Ott, H. R., Onuki, Y.
We report a study of the low-temperature high-pressure phase diagram of the intermetallic compound PrCu$_2$, by means of molecular-field calculations and $^{63,65}$Cu nuclear-quadrupole-resonance...
Lavagnini, M., Baldini, M., Sacchetti, A., Di Castro, D., Delley, B., Monnier, R., ...
We report on a Raman scattering investigation of the charge-density-wave (CDW), quasi two-dimensional rare-earth tri-tellurides $R$Te$_3$ ($R$= La, Ce, Pr, Nd, Sm, Gd and Dy) at ambient pressure, and...
Melting of the Na layers in solid Na0.8CoO2 (2008)
Weller, M., Sacchetti, A., Ott, H. R., Mattenberger, K., Batlogg, B.
Data of 23Na NMR spectra- and relaxation measurements are interpreted as suggesting that, upon increasing temperature the Na layers in Na0.8CoO2 adopt a 2D liquid state at T=291 K. The corresponding...
Passarella, D., Giardini, A., Peretto, B., Fontana, G., Sacchetti, A., Silvani, A., ...
A series of novel hybrid compounds obtained by the attachment of anhydrovinblastine, vinorelbine, and vindoline to thiocolchicine, podophyllotoxin, and baccatin III are described. Two types of diacyl...
Pressure dependence of the optical properties of the charge-density-wave compound LaTe$_2$ (2007)
Lavagnini, M., Sacchetti, A., Degiorgi, L., Arcangeletti, E., Baldassarre, L., Postorino, P., ...
We report the pressure dependence of the optical response of LaTe$_2$, which is deep in the charge-density-wave (CDW) ground state even at 300 K. The reflectivity spectrum is collected in the...
Resonances in twisted quantum waveguides (2007)
In this paper we consider embedded eigenvalues of a Schroedinger Hamiltonian in a waveguide induced by a symmetric perturbation. It is shown that these eigenvalues become unstable and turn into...
High pressure Raman study of La$_{1-x}$Ca$_x$MnO$_{3-\delta}$ manganites (2007)
Sacchetti, A., Corridoni, T., Arcangeletti, E., Postorino, P.
We report on a high-pressure Raman study on two members of the La$_{1-x}$Ca$_x$MnO$_{3-\delta}$ manganite family ($x=0.20$, $\delta=0$ and $\delta=0.08$). The results obtained for the $\delta=0$...
Pressure induced variation of the ground state of CeAl3 (2007)
Weller, M., Gavilano, J. L., Sacchetti, A., Ott, H. R.
Pressure-induced variations of $^{27}$Al NMR spectra of CeAl$_3$ indicate significant changes in the ground-state characteristics of this prototypical heavy-electron compound. Previously reported...
^{63,65}Cu NMR and NQR evidence for an unusual spin dynamics in PrCu_2 below 100 K (2007)
Sacchetti, A., Weller, M., Gavilano, J. L., Mudliar, R., Pedrini, B., Magishi, K., ...
We report the results of a $^{63,65}$Cu NMR/NQR study probing the intermetallic compound PrCu$_2$. The previously claimed onset of magnetic order at 65 K, indicated in a $\mu$SR study, is not...
Optical properties of the Ce and La di-telluride charge density wave compounds (2007)
Lavagnini, M., Sacchetti, A., Degiorgi, L., Shin, K. Y., Fisher, I. R.
The La and Ce di-tellurides LaTe$_2$ and CeTe$_2$ are deep in the charge-density-wave (CDW) ground state even at 300 K. We have collected their electrodynamic response over a broad spectral range...
Pressure dependence of the charge-density-wave gap in rare-earth tri-tellurides (2006)
Sacchetti, A., Arcangeletti, E., Perucchi, A., Baldassarre, L., Postorino, P., Lupi, S., ...
We investigate the pressure dependence of the optical properties of CeTe$_3$, which exhibits an incommensurate charge-density-wave (CDW) state already at 300 K. Our data are collected in the...
Sacchetti, A., Degiorgi, L., Giamarchi, T., Ru, N., Fisher, I. R.
We report on the first optical measurements of the rare-earth tri-telluride charge-density-wave systems. Our data, collected over an extremely broad spectral range, allow us to observe both the Drude...
Tuning topological disorder in MgB$_{2}$ (2006)
Di Castro, D., Cappelluti, E., Lavagnini, M., Sacchetti, A., Palenzona, A., Putti, M., ...
We carried out Raman measurements on neutron-irradiated and Al-doped MgB$_2$ samples. The irradiation-induced topological disorder causes an unexpected appearance of high frequency spectral...
Raman spectroscopy on cubic and hexagonal SrMnO$_3$ (2005)
Sacchetti, A., Baldini, M., Postorino, P., Martin, C., Maignan, A.
We report on the first optical characterization of both cubic and hexagonal SrMnO$_3$. Room-temperature Raman spectra collected by means of a micro-Raman spectrometer are shown. The spectrum of the...
Role of charge doping and lattice distortions in codoped Mg_{1-x}(AlLi)_{x}B_2 compounds (2005)
Monni, M., Ferdeghini, C., Manfrinetti, P., Palenzona, A., Putti, M., Affronte, M., ...
We prepared a series of Mg_{1-x}(AlLi)_{x}B_2 samples with 0≤x≤0.45 in order to compensate with Li the electron doping induced by Al. Structural characterization by means of neutron and...
Stabilization of an orthorhombic phase in LiMn2O4 by means of high pressure. (2005)
Paolone, A., Sacchetti, A., Postorino, P., Cantelli, R., Congeduti, A., Rousse, G., ...
LiMn2O4 is considered a promising material for the Li ion battery technology. Moreover, this material has been largely investigated in the last few years because it presents a charge order transition...
High-Pressure Phase Diagram in the Manganites: a Two-site Model Study (2004)
Sacchetti, A., Postorino, P., Capone, M.
The pressure dependence of the Curie temperature $T_C$ in manganites, recently studied over a wide pressure range, is not quantitatively accounted for by the quenching of Jahn-Teller distortions, and...
Postorino, P., Congeduti, A., Dore, P., Gorelli, F. A., Ulivi, L., Sacchetti, A., ...
A comprehensive understanding of the physical origin of the unique magnetic and transport properties of A_(1-x)A'^xMnO_3 manganites (A = trivalent rare-earth and A' = divalent alkali-earth metal) is...
Sacchetti, A., Subramaniam, V., Jovin, T. M., Alberti, S.
The coral red fluorescent protein (DsRed) absorbs and emits light at much higher wavelengths than the structurally homologous green fluorescent protein, raising questions about the properties of its...