Výsledky vyhledávání - "Gisèle Gruener"

Heisenberg spin-glass behaviour inGa0.99Yb0.01FeO3

Autor: Gisèle Gruener, Daniela Maria Neacsa, Jean-Claude Soret, Sylvie Hébert

Publikováno v: Journal of Magnetism and Magnetic Materials. 432:68-76

The dynamic and static magnetic properties of Ga0.99Yb0.01FeO3 are studied in detail using ac susceptibility and dc magnetization measurements. The study shows that the compound undergoes a spin-glass freezing at T g ≈ 213 K . The dynamic scaling a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::44187bc410ada01da2dd0c60376147fd
https://doi.org/10.1016/j.jmmm.2017.01.086

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Sub-Terahertz Excitations in Manganites with Commensurate Charge Order

Autor: Ulrich Schade, R. Sopracase, Paola Maselli, J. García, Alessandro Nucara, M. Cestelli Guidi, Michele Ortolani, Gisèle Gruener, Paolo Calvani

Publikováno v: Journal of Superconductivity and Novel Magnetism. 22:13-16

The optical conductivity of La–Ca, Nd–Sr, and Bi–Sr manganites with commensurate charge order (CO) has been first observed in the sub-THz region. Below, the ordering temperature TCO well-defined peaks are observed, associated with side bands. T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3654d6073534010979fb0dd68eea9d1
https://doi.org/10.1007/s10948-008-0366-4

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Dependence of optical conductivity with δ in La2NiO4+δ single crystals

Autor: Gisèle Gruener, Nathalie Poirot, Vinh Ta Phuoc, François Gervais

Publikováno v: Solid State Sciences. 7:1157-1162

Optical conductivity and electrical resistivity of La2NiO4+δ ( δ = 0.11 and 0.14) single crystals have been investigated for the ( a , b ) plane. Results show several changes of regime that are connected with the onset of spin and charge order, sta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::65cdb42a802db7d1d6135928d6dbbf83
https://doi.org/10.1016/j.solidstatesciences.2005.06.005

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OPTICAL CONDUCTIVITY OF OXIDES

Autor: Vinh Ta Phuoc, Cedric Coquelet, Ricardo P. S. M. Lobo, François Gervais, Gisèle Gruener, Nathalie Poirot

Publikováno v: International Journal of Modern Physics B. 19:153-157

Optical conductivity spectra of conducting oxides including high-TC cuprates - compared to non-superconducting nickelates in particular - deduced from infrared reflectivity spectroscopy in polarized light and their doping and temperature dependence,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9680c96d59cd84218774bd6b90fd5a50
https://doi.org/10.1142/s0217979205028128

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Ionic conductivity in the ternary system SiO2 - Al2O3 - CaO: measurements from the solid up to the liquid state

Autor: J.P. Loup, Gisèle Gruener, Philippe Odier, Patrick Echegut, Domingos De Sousa Meneses

Publikováno v: High Temperatures-High Pressures. 34:177-183

A specific apparatus to acquire conductivity data on glass former systems such as alumino-silicates in both solid and liquid state is reported. To illustrate the abilities of such a device, typical results obtained on a compound belonging to the alum

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::46566a6e67195af1bb98a7b70906cb21
https://doi.org/10.1068/htwu322

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Evidence of large nonlinear magnetic effects in the paramagnetic phase of GaFeO3

Autor: F. M. Vitucci, Paolo Calvani, Gisèle Gruener, Jean-Claude Soret

Magnetic susceptibility and magnetization measurements have been performed on a polycrystalline sample of GaFeO${}_{3}$ and compared with $X$-band electronic spin resonance (ESR) experiments. The persistence of nonlinear effects in the presence of re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd5362b75e3df8f627f7681597fe692b
http://hdl.handle.net/11573/437001

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Infrared study of the phonon modes in PrMnO3 and CaMnO3

Autor: Enrick Olive, R. Sopracase, Jean-Claude Soret, Gisèle Gruener

Publikováno v: Physica B: Condensed Matter
Physica B: Condensed Matter, Elsevier, 2010, 405 (1), pp.45-52. ⟨10.1016/j.physb.2009.08.007⟩

The infrared (IR) reflectivity spectra of orthorhombic manganese perovskites PrMnO$_3$ and CaMnO$_3$ are studied in the frequency range of optical phonon modes at temperatures varying from 300 to 4 K. The IR phonon spectra of these two materials are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53f4d8a2024dd73679f7ac81ab9f509a
https://hal-univ-tours.archives-ouvertes.fr/hal-01794733

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Observation of charge-density-wave excitations in manganites

Autor: Paola Maselli, Alessandro Nucara, Ulrich Schade, M. Cestelli Guidi, Jose H. Garcia, R. Sopracase, Paolo Calvani, Gisèle Gruener, Michele Ortolani

Publikováno v: Physical review letters
info:cnr-pdr/source/autori:Nucara, A; Maselli, P; Calvani, P; Sopracase, R; Ortolani, M; Gruener, G; Guidi, MC; Schade, U; Garcia, J/titolo:Observation of charge-density-wave excitations in manganites/doi:10.1103%2FPhysRevLett.101.066407/rivista:Physical review letters (Print)/anno:2008/pagina_da:066407/pagina_a:/intervallo_pagine:066407/volume:101

In the optical conductivity of four different manganites with commensurate charge order (CO), strong peaks appear in the meV range below the ordering temperature T_{CO}. They are similar to those reported for one-dimensional charge density waves (CDW

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db5c17ddd4a2b3ac2379c20b2432ec07
http://www.cnr.it/prodotto/i/3381

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Infrared study of La1.92Sr0.08CuO4 and La1.85Sr0.15CuO4 single crystals

Autor: Vinh Ta Phuoc, Gisèle Gruener, François Gervais, B. Pignon, Christophe Marin, L. Ammor

Publikováno v: Physica C: Superconductivity. :868-869

Infrared reflectivity temperature measurements have been measured on two La 2− x Sr x CuO 4 single crystals with x = 0.08 (underdoped) and x = 0.15 (optimally doped), in-plane and out-of-plane. The obtained optical conductivity results suggest the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fdf95ba405090190893b08d9e3e8a629
https://doi.org/10.1016/j.physc.2007.03.093

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Comparative infrared study of optimally doped and underdoped La2−xSrxCuO4single crystals

Autor: B. Pignon, Gisèle Gruener, François Gervais, L. Ammor, V. Ta Phuoc, C. Marin

Publikováno v: Journal of Physics: Condensed Matter. 20:075230

The temperature dependence of the optical spectra of two La2?xSrxCuO4 single crystals was investigated for both in-plane and out-of-plane directions. For the underdoped (x = 0.08) single crystal, the in-plane optical conductivity that was analysed by

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7447ddbdfcd25cedf3e3f1e18f5357f0
https://doi.org/10.1088/0953-8984/20/7/075230

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