Publications (39)
Evidence of a pressure-induced metallization process in monoclinic VO
E. Arcangeletti, L. Baldassarre, D. Di Castro +5
Raman and combined trasmission and reflectivity mid infrared measurements have been carried out on monoclinic VO at room temperature over the 0-19 GPa and 0-14 GPa pressure ran…
Electrodynamics of superconducting pnictide superlattices
A. Perucchi, F. Capitani, P. Di Pietro +8
It has been recently reported (S. Lee et al., Nature Materials 12, 392, 2013) that superlattices where layers of the 8% Co-doped BaFe2As2 superconducting pnictide are intercalated…
Magneto-optical evidence of double exchange in a percolating lattice
G. Caimi, A. Perucchi, L. Degiorgi +5
Substituting by in ferromagnetic leads to a percolation limited magnetic ordering. We present and discuss magneto-optical data of the series,…
Spectral weight redistribution in (LaNiO3)n/(LaMnO3)2 superlattices from optical spectroscopy
P. Di Pietro, J. Hoffman, A. Bhattacharya +2
We have studied the optical properties of four (LaNiO)/(LaMnO) superlattices (SL) (=2, 3, 4, 5) on SrTiO substrates. We have measured the reflectivity at tem…
Optical Properties of (SrMnO3)n/(LaMnO3)2n superlattices: an insulator-to-metal transition observed in the absence of disorder
A. Perucchi, L. Baldassarre, A. Nucara +6
We measure the optical conductivity of (SrMnO3)n/(LaMnO3)2n superlattices (SL) for n=1,3,5, and 8 and 10 < T < 400 K. Data show a T-dependent insulator to metal transition (IMT) fo…
Quasi-two-dimensional thermoelectricity in SnSe
V. Tayari, B. V. Senkovskiy, D. Rybkovskiy +14
Stannous selenide is a layered semiconductor that is a polar analogue of black phosphorus, and of great interest as a thermoelectric material. Unusually, hole doped SnSe supports a…
Magneto-optical reflectivity of superconducting MgB2 single crystals
A. Perucchi, L. Degiorgi, J. Jun +2
We present magneto-optical reflectivity results in the basal-plane of the hexagonal . The data were collected on a mosaic of single crystals with from…
Pressure dependent relaxation in the photo-excited Mott insulator ETF2TCNQ: Influence of hopping and correlations on quasiparticle recombination rates
M. Mitrano, G. Cotugno, S. R. Clark +12
Femtosecond relaxation of photo-excited quasiparticles in the one dimensional Mott insulator ET-F2TCNQ are measured as a function of external pressure, which is used to tune the el…
Optical evidence for a spin-filter effect in the charge transport of
A. Perucchi, G. Caimi, H. R. Ott +3
We have measured the optical reflectivity of as a function of temperature between 1.5 and 300 and in external magnetic fields up to 7 . The s…
Electrodynamic properties of an artificial heterostructured superconducting cuprate
A. Perucchi, P. Di Pietro, S. Lupi +6
We perform infrared conductivity measurements on a series of CaCuO/SrTiO heterostructures made by the insulating cuprate CaCuO (CCO) and the insulating perovkite SrTiO$…
Optical investigation of the metal-insulator transition in
A. Perucchi, L. Degiorgi, R. Hu +2
We present a comprehensive optical study of the narrow gap semiconductor. From the optical reflectivity, measured from the far infrared up to the ultraviolet spectral rang…
Optical investigation of the charge-density-wave phase transitions in
A. Perucchi, L. Degiorgi, R. E. Thorne
We have measured the optical reflectivity of the quasi one-dimensional conductor from the far infrared up to the ultraviolet between 10 and 300 using light p…
MgB2 single crystals: high pressure growth and anisotropic properties
J. Karpinski, M. Angst, J. Jun +11
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 in…
Transport and infrared properties of SmFeAs(O1-xFx): from SDW to superconducting ordering
M. Tropeano, C. Fanciulli, C. Ferdeghini +12
We report measurements of resistivity, magnetoresistivity, Hall effect, Seebeck coefficient, infrared reflectivity of undoped SmFeAsO and lightly doped SmFeAs(O0.93F0.07) oxypnicti…
Optical conductivity of V4O7 across its metal-insulator transition
I. Lo Vecchio, M. Autore, F. D'Apuzzo +6
The optical properties of a V4O7 single crystal have been investigated from the high temperature metallic phase down to the low temperature antiferromagnetic insulating one. The te…
Infrared signature of the charge-density-wave gap in
A. Perucchi, L. Degiorgi, H. Berger
The chain-like compound undergoes a charge-density-wave (CDW) transition at , most strongly affecting the conductivity perpendicular to the chains. We meas…
Metallic ground state and glassy transport in single crystalline URhGe: Enhancement of disorder effects in a strongly correlated electron system
S. Süllow, I. Maksimov, A. Otop +4
We present a detailed study of the electronic transport properties on a single crystalline specimen of the moderately disordered heavy fermion system URhGe. For this materi…
Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB.
M. Ortolani, P. Dore, D. Di Castro +7
The optical response of the two-band superconductor MgB has been studied in the 0.7-4 THz range on films with very low impurity level. The effect of the high-energy -gap is…
Pressure and alloying effects on the metal to insulator transition in NiS{2-x}Se{x} studied by infrared spectroscopy
A. Perucchi, C. Marini, M. Valentini +11
The metal to insulator transition in the charge transfer NiS{2-x}Se{x} compound has been investigated through infrared reflectivity. Measurements performed by applying pressure to…
Pressure dependence of the charge-density-wave gap in rare-earth tri-tellurides
A. Sacchetti, E. Arcangeletti, A. Perucchi +6
We investigate the pressure dependence of the optical properties of CeTe, which exhibits an incommensurate charge-density-wave (CDW) state already at 300 K. Our data are collec…
The optical phonon spectrum of SmFeAsO
C. Marini, C. Mirri, G. Profeta +12
We measured the Raman and the Infrared phonon spectrum of SmFeAsO polycrystalline samples. We also performed Density Functional Theory calculations within the pseudopotential appro…
Universal conductivity and the electrodynamics of graphite at high pressures
A. Perucchi, L. Baldassarre, C. Marini +4
We address the in-plane pressure-dependent electrodynamics of graphite through synchrotron based infrared spectroscopy and ab initio Density Functional Theory calculations. The Dru…
Electrodynamics of BaFe2As2 from infrared measurements under pressure
L. Baldassarre, A. Perucchi, P. Postorino +8
We report on an infrared study on the undoped compound BaFe2As2 as a function of both pressure (up to about 10 GPa) at three temperatures (300, 160, and 110 K). The evolution with…
Electrodynamics near the Metal-to-Insulator Transition in V3O5
L. Baldassarre, A. Perucchi, E. Arcangeletti +5
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 spectrosco…
Vibrational spectrum of solid picene (C_22H_14)
B. Joseph, L. Boeri, L. Malavasi +11
Recently, Mitsuhashi et al., have observed superconductivity with transition temperature up to 18 K in potassium doped picene (C22H14), a polycyclic aromatic hydrocarbon compound […
An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc
M. Mitrano, A. Cantaluppi, D. Nicoletti +10
The control of non-equilibrium phenomena in complex solids is an important research frontier, encompassing new effects like light induced superconductivity. Here, we show that cohe…
Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies
A. Perucchi, L. Baldassarre, C. Marini +10
We measured the THz reflectance properties of a high quality epitaxial thin film of the Fe-based superconductor BaFeCoAs with T=22.5 K. The film was grown…
A combined experimental and computational study of the pressure dependence of the vibrational spectrum of solid picene C_22H_14
F. Capitani, M. Hoeppner, B. Joseph +9
We present high-quality optical data and density functional perturbation theory calculations for the vibrational spectrum of solid picene (CH) under pressure up to 8…
Pressure dependence of the single particle excitation in the charge-density-wave CeTe system
M. Lavagnini, A. Sacchetti, C. Marini +8
We present new data on the pressure dependence at 300 K of the optical reflectivity of CeTe, which undergoes a charge-density-wave (CDW) phase transition well above room temper…
Far infrared properties of the rare-earth scandate DyScO3
L. Baldassarre, A. Perucchi, S. Lupi +1
We present reflectance measurements in the infrared region on a single crystal the rare earth scandate DyScO3. Measurements performed between room temperature and 10 K allow to det…
Two-band conductivity of a FeSeTe film by reflectance measurements in the terahertz and infrared range
A. Perucchi, B. Joseph, S. Caramazza +7
We report an infrared spectroscopy study of a 200 nm thick FeSeTe film grown on LaAlO with T=13.7 K. We analyze the 20 K normal state absolute reflectance R…
Multi-band conductivity and multi-gap superconductivity in V3Si from optical measurements on films at terahertz frequencies
A. Perucchi, D. Nicoletti, M. Ortolani +13
The possibility of multi-band conductivity and multi-gap superconductivity is explored in oriented V3Si thin films by means of reflectance and transmittance measurements at teraher…
Pressure dependence of the optical properties of the charge-density-wave compound LaTe
M. Lavagnini, A. Sacchetti, L. Degiorgi +7
We report the pressure dependence of the optical response of LaTe, which is deep in the charge-density-wave (CDW) ground state even at 300 K. The reflectivity spectrum is colle…
Electronic correlation assisted ferroelectric metallic state in LiOsO
I. Lo Vecchio, G. Giovannetti, M. Autore +6
LiOsO has been recently identified as the first unambiguous "ferroelectric metal", experimentally realizing a prediction from 1965 by Anderson and Blount. In this work, we inve…
A Microscopic View on the Mott transition in Chromium-doped V2O3
S. Lupi, L. Baldassarre, B. Mansart +18
V2O3 is the prototype system for the Mott transition, one of the most fundamental phenomena of electronic correlation. Temperature, doping or pressure induce a metal to insulator t…
Pressure tuning of light-induced superconductivity in K3C60
A. Cantaluppi, M. Buzzi, G. Jotzu +7
Optical excitation at terahertz frequencies has emerged as an effective means to manipulate complex solids dynamically. In the molecular solid K3C60, coherent excitation of intramo…
Optical properties of V2O3 in its whole phase diagram
I. Lo Vecchio, L. Baldassarre, F. D'Apuzzo +7
Vanadium sesquioxide V2O3 is considered a textbook example of Mott-Hubbard physics. In this paper we present an extended optical study of its whole temperature/doping phase diagram…
Emergent Dirac carriers across a pressure-induced Lifshitz transition in black phosphorus
P. Di Pietro, M. Mitrano, S. Caramazza +11
The phase diagrams of correlated systems like cuprates or pnictides high-temperature superconductors are characterized by a topological change of the Fermi surface under continuous…
Quasiparticle evolution and pseudogap formation in V2O3: An infrared spectroscopy study
L. Baldassarre, A. Perucchi, D. Nicoletti +10
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 tempera…