Zobrazeno 1 - 10
of 260
pro vyhledávání: '"P. Echegut"'
Autor:
B. Rousseau, S. Guevelou, A. Mekeze-Monthe, J. Vicente, L. Del Campo, D. De Sousa Meneses, P. Echegut, C. Caliot, G. Flamant
Publikováno v:
AIP Advances, Vol 6, Iss 6, Pp 065226-065226-6 (2016)
A simple and robust analytical model is used to finely predict the spectral emittance under air up to 1300 K of α-SiC open-cell foams constituted of optically thick struts. The model integrates both the chemical composition and the macro-porosity an
Externí odkaz:
https://doaj.org/article/0f7aa63a181748628be0ff8cd53aa248
Autor:
Massa, Néstor E., del Campo, Leire, Holldack, Karsten, Phuoc, Vinh Ta, Echegut, Patrick, Kayser, Paula, Alonso, José Antonio
Publikováno v:
Phys. Rev. B 98, 184302 (2018)
We report on the high-temperature evolution of far- and mid- infrared reflectivity and emissivity spectra of ambient orthorhombic ErMnO3 from 12 K to sample decomposition above 1800 K. At low temperatures the number of phonons agrees with the predict
Externí odkaz:
http://arxiv.org/abs/1811.04694
Autor:
Massa, Néstor E., Holldack, Karsten, Sopracase, Rodolphe, Phuoc, Vinh Ta, del Campo, Leire, Echegut, Patrick, Alonso, José Antonio
We report on THz absorption spectroscopy combined with high magnetic fields of polycrystalline RCrO3 (R= Pr, Sm, Er) aiming understanding spin wave resonances at their low temperature magnetic phases. Our measurements show that the temperature, and t
Externí odkaz:
http://arxiv.org/abs/1708.01497
Autor:
Massa, Néstor E., del Campo, Leire, Meneses, Domingos De Sousa, Echegut, Patrick, Martínez-Lope, María Jesús, Alonso, José Antonio
Publikováno v:
J. Phys. Condens. Matter 26 (2014) 275901
We report on TmMnO3 far infrared emissivity and reflectivity spectra from 1910 K to 4 K. At the highest temperature the number of infrared bands is lower than that predicted for centrosymmetric P63/mmc (D6h4) (Z=2) space group due high temperature an
Externí odkaz:
http://arxiv.org/abs/1406.4382
Autor:
del Campo, Néstor E. Massa. Leire, Meneses, Domingos De Sousa, Echegut, Patrick, Martínez-Lope, María Jesús, Alonso, José Antonio
Publikováno v:
J. Phys.: Condens. Matter 25 (2013) 395601
We report on far- and mid-infrared reflectivity of NdMnO3 from 4 K to 300K. Two main features are distinguished in the infrared spectra: active phonons in agreement with the expected for orthorhombic D2h 16-Pbnm (Z=4) space group remaining constant d
Externí odkaz:
http://arxiv.org/abs/1309.1479
Autor:
Massa, Néstor E., del Campo, Leire, Meneses, Domingos De Sousa, Echegut, Patrick, Martínez-Lope, María Jesús, Alonso, José Antonio
Publikováno v:
J. Phys.: Condens. Matter 25 (2013) 235603
We report on near normal far- and mid-infrared emission and reflectivity of NdMnO3 perovskite from room temperature to sample decomposition above 1800 K. At 300 K the number infrared active phonons is in close agreement with the 25 calculated for the
Externí odkaz:
http://arxiv.org/abs/1309.1482
Autor:
Massa, Néstor E., García-Flores, Ali F., Meneses, Domingos De Sousa, del Campo, Leire, Echegut, Patrick, Fabbris, Gilberto F. L., Martínez-Lope, María Jesús, Alonso, José Antonio
We report on electronic collective excitations in RMn2O5 (R= Pr, Sm, Gd, Tb) showing condensation starting at and below TN\simTC\sim40-50 K. Its origin is understood as partial delocalized eg electron orbitals in the Jahn-Teller distortion of the pyr
Externí odkaz:
http://arxiv.org/abs/1204.3406
The short-range structure of an iron doped soda-lime glass was investigated by infrared emissivity spectroscopy from room temperature up to the melt. Quantitative information on the distribution of the Q^n tetrahedral units was obtained by fitting th
Externí odkaz:
http://arxiv.org/abs/1201.5676
Autor:
Massa, Néstor E., del Campo, Leire, Meneses, Domingos De Sousa, Echegut, Patrick, Fabbris, Gilberto F. L., Azevedo, G. de M., Martínez-Lope, María Jesús, Alonso, José Antonio
Publikováno v:
JOURNAL OF APPLIED PHYSICS 108, 1 (2010)
We report on the lattice evolution of BiFeO3 as function of temperature using far infrared emissivity, reflectivity, and X-ray absorption local structure. A power law fit to the lowest frequency soft phonon in the magnetic ordered phase yields an exp
Externí odkaz:
http://arxiv.org/abs/1009.1773
Autor:
De Silans, Thierry Passerat, Maurin, Isabelle, Segundo, Pedro Chaves De Souza, Saltiel, Solomon, Gorza, Marie-Pascale, Ducloy, Martial, Bloch, Daniel, Meneses, Domingo De Sousa, Echegut, Patrick
Publikováno v:
Journal of Physics : Condensed Matter 21 (2009) 255902
The temperature behaviour in the range 22\degree C to 500\degree C of the dielectric permittivity in the infrared range is investigated for CaF2, BaF2 and Al2O3 through reflectivity measurements. The dielectric permittivity is retrieved by fitting re
Externí odkaz:
http://arxiv.org/abs/0905.4710