Universität zu Köln

Ulbrich, H., Krueger, F., Nugroho, A. A., Lamago, D., Sidis, Y. and Braden, M. (2011). Spin-wave excitations in the ferromagnetic metallic and in the charge-, orbital-, and spin-ordered states in Nd1-xSrxMnO3 with x approximate to 0.5. Phys. Rev. B, 84 (9). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1098-0121

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Abstract

We report inelastic neutron-scattering experiments on single crystals of Nd1-xSrxMnO3 with x = 0.5 and x = 0.49. The spin-wave dispersion in the charge-, orbital-, and spin-ordered state in Nd0.5Sr0.5MnO3 exhibits a strongly anisotropic stiffness. The sign of the anisotropy is characteristic for the site-centered model for charge and orbital ordering in half doped manganites. Within this model, linear spin-wave theory yields a perfect description of the experimental dispersion. In the ferromagnetic metallic state of Nd1-xSrxMnO3 with x = 0.49 and x = 0.50 magnetic excitations exhibit nearly the same magnon dispersion. High intense signals near the zone boundary over a wide energy level overlap with a sharp spin-wave dispersion, which can be described with a Heisenberg model including nearest-neighbor interactions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ulbrich, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Krueger, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nugroho, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lamago, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sidis, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-488834
DOI:	10.1103/PhysRevB.84.094453
Journal or Publication Title:	Phys. Rev. B
Volume:	84
Number:	9
Date:	2011
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1098-0121
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COLOSSAL MAGNETORESISTIVE MANGANITES; HALF-DOPED MANGANITES; JAHN-TELLER PHONONS; MAGNETIC ORDER; A-TYPE; TRANSITION; LA0.5SR1.5MNO4; DIFFRACTION; DYNAMICS; LAMNO3 Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48883