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Dive into the research topics where A. M. de Leon-Guevara is active.

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Featured researches published by A. M. de Leon-Guevara.


Physical Review B | 1998

Structure and spin dynamics of La 0.85 Sr 0.15 MnO 3

L. Vasiliu-Doloc; J. W. Lynn; A.H. Moudden; A. M. de Leon-Guevara; A. Revcolevschi

Neutron scattering has been used to study the structure and spin dynamics of


Journal of Applied Physics | 1997

Neutron scattering investigation of the structure and spin dynamics in La0.85Sr0.15MnO3

L. Vasiliu-Doloc; J. W. Lynn; A.H. Moudden; A. M. de Leon-Guevara; A. Revcolevschi

{\mathrm{La}}_{0.85}{\mathrm{Sr}}_{0.15}{\mathrm{MnO}}_{3}.


Journal of Alloys and Compounds | 1997

Controlled reduction and oxidation of La0.85Sr0.15MnO3 single crystals

A. M. de Leon-Guevara; P. Berthet; J. Berthon; F. Millot; A. Revcolevschi

The magnetic structure of this system is ferromagnetic below


Physica B-condensed Matter | 1997

Magnetic coherence in the paramagnetic state of mixed-valence manganites

M. Viret; H. Glättli; C. Fermon; A. M. de Leon-Guevara; A. Revcolevschi

{T}_{C}\ensuremath{\simeq}235\mathrm{K}.


Physica B-condensed Matter | 1997

Spin waves of lightly doped La1−xSrxMnO3

A.H. Moudden; L. Vasiliu-Doloc; A. Goukassov; A. M. de Leon-Guevara; L. Pinsard; A. Revcolevschi

We see anomalies in the Bragg peak intensities and new superlattice peaks consistent with the onset of a spin-canted phase below


Journal of Applied Physics | 1997

Spin dynamics of lightly doped La1−xSrxMnO3 (abstract)

A.H. Moudden; L. Vasiliu-Doloc; A. M. de Leon-Guevara; L. Pinsard; A. Revcolevschi

{T}_{\mathrm{CA}}\ensuremath{\sim}205\mathrm{K},


Physical Review B | 1997

Influence of controlled oxygen vacancies on the magnetotransport and magnetostructural phenomena in La{sub 0.85}Sr{sub 0.15}MnO{sub 3{minus}{delta}} single crystals

A. M. de Leon-Guevara; P. Berthet; J. Berthon; F. Millot; A. Revcolevschi; A. Anane; C. Dupas; K. Le Dang; J. P. Renard; P. Veillet

which appears to be associated with a small gap at


EPL | 1998

Magnetic coherence above the Curie point in ferromagnetic LaSrMnO manganites

M. Viret; H. Glättli; C. Fermon; A. M. de Leon-Guevara; A. Revcolevschi

q=(0,0,0.5)


Physical Review B | 1998

Quantized conductance in a contact between metallic oxide crystals

F. Ott; S. Barberan; J. G. Lunney; J. M. D. Coey; P. Berthet; A. M. de Leon-Guevara; A. Revcolevschi

in the spin-wave spectrum. Anomalies in the lattice parameters indicate a concomitant lattice distortion. The long-wavelength magnetic excitations are found to be conventional spin waves, with a gapless


European Physical Journal B | 1999

The charge ordered phase in \(\) studied by means of high energy X-ray diffraction

T. Niemöller; M. von Zimmermann; S. Uhlenbruck; O. Friedt; B. Büchner; T. Frello; Niels Hessel Andersen; P. Berthet; L. Pinsard; A. M. de Leon-Guevara; A. Revcolevschi; J. R. Schneider

(l0.02\mathrm{meV})

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Dive into the A. M. de Leon-Guevara's collaboration.

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L. Vasiliu-Doloc

National Institute of Standards and Technology

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A.H. Moudden

Centre national de la recherche scientifique

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P. Berthet

University of Paris-Sud

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L. Pinsard

University of Paris-Sud

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F. Millot

University of Paris-Sud

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J. Berthon

University of Paris-Sud

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A. Goukassov

Centre national de la recherche scientifique

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C. Fermon

Centre national de la recherche scientifique

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M. Viret

Centre national de la recherche scientifique

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