Publications (10)
Optical study of the vibrational and dielectric properties of BiMnO3
W. S. Mohamed, A. Nucara, G. Calestani +5
BiMnO3 (BMO), ferromagnetic (FM) below Tc = 100 K, was believed to be also ferroelectric (FE) due to a non-centro-symmetric C2 structure, until diffraction data indicated that its…
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…
Revealing the KH2PO4 soft-mode coupling mechanism with infrared spectroscopy under pressure
D. Santos-Cottin, S. Nasrallah, F. Capitani +4
We measured the far-infrared reflectivity of a KH2PO4 single crystal up to pressures of 2 GPa in the ferroelectric and paraelectric phases. We find that the nu4 vibrational mode of…
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…
Spectroscopy of HS: evidence of a new energy scale for superconductivity
F. Capitani, B. Langerome, J. -B. Brubach +6
The discovery of a superconducting phase in sulfur hydride under high pressure with a critical temperature above 200 K has provided a new impetus to the search for even higher $T_c…
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…
Coexistence of pressure-induced structural phases in bulk black phosphorus: a combined x-ray diffraction and Raman study up to 18 GPa
B. Joseph, S. Caramazza, F. Capitani +7
We report a study of the structural phase transitions induced by pressure in bulk black phosphorus by using both synchrotron x-ray diffraction for pressures up to 12.2 GPa and Rama…
Raman phonon spectrum of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7
F. Capitani, S. Koval, R. Fittipaldi +9
The Raman spectrum of Ba2CuGe2O7, a tetragonal insulator which develops Dzyaloshinsky- Moriya helical magnetism below TN = 3.2 K, has been detected at temperatures varying from 300…
Infrared study of the quasi-two-dimensional electron system at the interface between SrTiO and crystalline or amorphous LaAlO
A. Nucara, M. Corasaniti, A. Kalaboukhov +9
We have used grazing-angle infrared spectroscopy to detect the Berreman effect (BE) in the quasi-two-dimensional electron system (q-2DES) which forms spontaneously at the interface…
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 […