Zobrazeno 1 - 10 of 53 pro vyhledávání: '"Néstor E. Massa"'
1
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Paramagnetic Collective Electronic Mode and Low Temperature Hybrid Modes in the Far Infrared Dynamics of Orthorhombic NdMnO3
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
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2
h−ErMnO3 absorbance, reflectivity, and emissivity in the terahertz to mid-infrared from 2 to 1700 K: Carrier screening, Fröhlich resonance, small polarons, and bipolarons
Autor: José Antonio Alonso, Néstor E. Massa, Leire del Campo, Aurélien Canizares, Karsten Holldack, Paula Kayser, Vinh Ta Phuoc
Publikováno v: Physical Review B. 102
We report the temperature-dependent THz to mid-infrared response of hexagonal-${\mathrm{ErMnO}}_{3}$ using absorption, reflectivity, and emissivity techniques from 2 to 1700 K. At low temperatures, lowest frequency vibrational modes, which extend up
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::14182e19a6f8a05057dbf922cd32ce7a
https://doi.org/10.1103/physrevb.102.134305
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4
Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region
Autor: Leire del Campo, R. Sopracase, José Antonio Alonso, Néstor E. Massa, Vinh Ta Phuoc, Karsten Holldack, Patrick Echegut
Publikováno v: Journal of Magnetism and Magnetic Materials
Journal of Magnetism and Magnetic Materials, Elsevier, 2018, 468, pp.294-303. ⟨10.1016/j.jmmm.2018.07.028⟩
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
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c77d1a4099a71eb80ad30154dca3d75
https://hal.archives-ouvertes.fr/hal-01898550
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5
Far- and mid-infrared emission and reflectivity of orthorhombic and cubic ErMnO3 : Polarons and bipolarons
Autor: Karsten Holldack, Leire del Campo, Néstor E. Massa, Patrick Echegut, José Antonio Alonso, Vinh Ta Phuoc, Paula Kayser
Publikováno v: Physical Review B. 98
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: https://explore.openaire.eu/search/publication?articleId=doi_________::53b2d3b5a19890d7c13909674a884bc4
https://doi.org/10.1103/physrevb.98.184302
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6
Far infrared near normal specular reflectivity of Nix(SiO2)1−x (x=1.0, 0.84, 0.75, 0.61, 0.54, 0.28) granular films
Autor: Fernando P. de la Cruz, Xixiang Zhang, Juliano C. Denardin, Marcelo Knobel, Néstor E. Massa, Leandro M. Socolovsky
Publikováno v: JOURNAL OF ALLOYS AND COMPOUNDS
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
One of the current issues at the basis of the understanding of novel materials is the degree of the role played by spatial inhomogeneities due to subtle phase separations. To clarify this picture here we compare the plain glass network response of tr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6f11ec16f1d05379f133eb5dbbe469f
https://doi.org/10.1016/j.jallcom.2009.10.228
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7
Energy-dispersive X-ray absorption spectroscopy at LNLS: investigation on strongly correlated metal oxides
Autor: Néstor E. Massa, Jean Paul Itié, Narcizo M. Souza-Neto, Hélio C. N. Tolentino, Aline Y. Ramos, Cinthia Piamonteze, Edilson Tamura, Alberto Caneiro, Flávio Garcia, María Jesús Martínez-Lope, Julio C. Cezar, Edson J. Carvalho, José Antonio Alonso, Régis T. Neueschwander
Publikováno v: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
Journal of Synchrotron Radiation
Journal of Synchrotron Radiation, International Union of Crystallography, 2010, 17, pp.93-102. ⟨10.1107/S0909049509041119⟩
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
Repositório Institucional da UFOP
Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
An energy-dispersive X-ray absorption spectroscopy beamline mainly dedicated to X-ray magnetic circular dichroism (XMCD) and material science under extreme conditions has been implemented in a bending-magnet port at the Brazilian Synchrotron Light La
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d806ec1dc0ef5678452971121f7cfa2d
https://doi.org/10.1107/s0909049509041119
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8
Spectroscopy properties of the amide group in valpromide and some derivatives with antiepileptic activity
Autor: Néstor E. Massa, Nieves C. Comelli, Alicia H. Jubert, Eduardo A. Castro
Publikováno v: Journal of Raman Spectroscopy. 40:1797-1809
Infrared spectra at 300 and 77 K and Raman spectra at 300 K of the valpromide (Vpd), N-substituted derivatives, N-ethylvalpromide (Etvpd), N-isopropylvalpromide (Ipvpd) and the N,N-disubstituted derivative, N,N-dimethylvalpromide (Dmvpd) with antiepi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::eed0fa7bfb4a10da219900162c849e40
https://doi.org/10.1002/jrs.2322
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9
Experimental and theoretical study of the structure and vibrational spectra of valpromide, C7H15CONH2
Autor: Nieves C. Comelli, Luis Enrique Bruno Blanch, Néstor E. Massa, Alicia H. Jubert, Eduardo A. Castro
Publikováno v: Journal of Raman Spectroscopy. 40:6-17
In this work, we present results of the conformational and vibrational properties of valpromide (Vpd), an amide with antiepileptic activity, studied by IR and Raman spectroscopy at 300 and 77 K, and 300 K, respectively. Experimental data are compared
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa0901a72fbcb124174a79e9ff09eaaf
https://doi.org/10.1002/jrs.2061
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10
Temperature and high-pressure dependent x-ray absorption of SmNiO3 at the Ni K and Sm L3 edges
Autor: Jairo Fonseca, Hélio C. N. Tolentino, Néstor E. Massa, Aline Y. Ramos, Narcizo M. Sousa-Neto, José Antonio Alonso
Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
Materials Research Express
Materials Research Express, IOP Publishing Ltd, 2015, 2 (12), pp.126301. ⟨10.1088/2053-1591/2/12/126301⟩
Wereport on x-ray absorption near-edge structure (XANES) and extended x-ray absorption fine; structure (EXAFS) measurements of SmNiO3 from 20 Kto 600 Kand up to 38 GPa at the NiKand Sm; L3 edges. A multiple component pre-NiKedge tail is understood, o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::00e610c61f55035266cd052fb5567990
http://sedici.unlp.edu.ar/handle/10915/129650
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