The optical phonon spectrum of SmFeAsO (2008)
Marini, C., Mirri, C., Profeta, G., Lupi, S., Di Castro, D., Sopracase, R., ...
We measured the Raman and the Infrared phonon spectrum of SmFeAsO polycrystalline samples. We also performed Density Functional Theory calculations within the pseudopotential approximation to obtain...
Transport and infrared properties of SmFeAs(O1-xFx): from SDW to superconducting ordering (2008)
Tropeano, M., Fanciulli, C., Ferdeghini, C., Marre', D., Siri, A. S., Putti, M., ...
We report measurements of resistivity, magnetoresistivity, Hall effect, Seebeck coefficient, infrared reflectivity of undoped SmFeAsO and lightly doped SmFeAs(O0.93F0.07) oxypnictides. All the...
Ortolani, M., Dore, P., Di Castro, D., Perucchi, A., Lupi, S., Ferrando, V., ...
The optical response of the two-band superconductor MgB$_2$ has been studied in the 0.7-4 THz range on films with very low impurity level. The effect of the high-energy $\sigma$-gap is observed in...
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...
Quasiparticle evolution and pseudogap formation in V2O3: An infrared spectroscopy study (2007)
Baldassarre, L., Perucchi, A., Nicoletti, D., Toschi, A., Sangiovanni, G., Held, K., ...
The infrared conductivity of V2O3 is measured in the whole phase diagram. Quasiparticles appear above the Neel temperature TN and eventually disappear further enhancing the temperature, leading to a...
Electrodynamics near the Metal-to-Insulator Transition in V3O5 (2007)
Baldassarre, L., Perucchi, A., Arcangeletti, E., Nicoletti, D., Di Castro, D., Postorino, P., ...
The electrodynamics near the metal-to-insulator transitions (MIT) induced, in V3O5 single crystals, by both temperature (T) and pressure (P) has been studied by infrared spectroscopy. The T- and...
Evidence of a pressure-induced metallization process in monoclinic VO$_2$ (2006)
Arcangeletti, E., Baldassarre, L., Di Castro, D., Lupi, S., Malavasi, L., Marini, C., ...
Raman and combined trasmission and reflectivity mid infrared measurements have been carried out on monoclinic VO$_2$ at room temperature over the 0-19 GPa and 0-14 GPa pressure ranges, respectively....
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...
Optical investigation of the metal-insulator transition in $FeSb_2$ (2005)
Perucchi, A., Degiorgi, L., Hu, R., Petrovic, C., Mitrovi{ć}, V.
We present a comprehensive optical study of the narrow gap $FeSb_2$ semiconductor. From the optical reflectivity, measured from the far infrared up to the ultraviolet spectral range, we extract the...
Magneto-optical evidence of double exchange in a percolating lattice (2005)
Caimi, G., Perucchi, A., Degiorgi, L., Ott, H. R., Pereira, V. M., Castro-Neto, A. H., ...
Substituting $Eu$ by $Ca$ in ferromagnetic $EuB_6$ leads to a percolation limited magnetic ordering. We present and discuss magneto-optical data of the $Eu_{1-x}Ca_{x}B_6$ series, based on...
Infrared signature of the charge-density-wave gap in $ZrTe_3$ (2005)
Perucchi, A., Degiorgi, L., Berger, H.
The chain-like $ZrTe_3$ compound undergoes a charge-density-wave (CDW) transition at $T_{CDW}=63$ $K$, most strongly affecting the conductivity perpendicular to the chains. We measure the temperature...
Süllow, S., Maksimov, I., Otop, A., Litterst, F. J., Perucchi, A., Degiorgi, L., ...
We present a detailed study of the electronic transport properties on a single crystalline specimen of the moderately disordered heavy fermion system URh$_2$Ge$_2$. For this material, we find glassy...
Optical investigation of the charge-density-wave phase transitions in $NbSe_{3}$ (2003)
Perucchi, A., Degiorgi, L., Thorne, R. E.
We have measured the optical reflectivity $R(\omega)$ of the quasi one-dimensional conductor $NbSe_{3}$ from the far infrared up to the ultraviolet between 10 and 300 $K$ using light polarized along...
Optical evidence for a spin-filter effect in the charge transport of $Eu_{0.6}Ca_{0.4}B_{6}$ (2003)
Perucchi, A., Caimi, G., Ott, H. R., Degiorgi, L., Bianchi, A. D., Fisk, Z.
We have measured the optical reflectivity $R(\omega)$ of $Eu_{0.6}Ca_{0.4}B_{6}$ as a function of temperature between 1.5 and 300 $K$ and in external magnetic fields up to 7 $T$. The slope at the...
MgB2 single crystals: high pressure growth and anisotropic properties (2002)
Karpinski, J., Angst, M., Jun, J., Kazakov, S. M., Puzniak, R., Wisniewski, A., ...
Single crystals of MgB2 with a size up to 1.5x0.9x0.2 mm3 have been grown with a high pressure cubic anvil technique. The crystal growth process is very peculiar and involves an intermediate nitride,...
Magneto-optical reflectivity of superconducting MgB2 single crystals (2002)
Perucchi, A., Degiorgi, L., Jun, J., Angst, M., Karpinski, J.
We present magneto-optical reflectivity results in the basal-plane of the hexagonal $MgB_2$. The data were collected on a mosaic of $MgB_2$ single crystals with $T_{c}=38 ~K$ from the ultraviolet...