Issue |
Europhys. Lett.
Volume 49, Number 4, February II 2000
|
|
---|---|---|
Page(s) | 514 - 520 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2000-00179-4 | |
Published online | 01 September 2002 |
Antiferromagnetic resonance in the canted phase of
:
Experimental evidence against electronic phase separation
1
General Physics Institute of the Russian Academy of Sciences
38 Vavilov St., 117942 Moscow, Russia
2
Experimentalphysik V, EKM, Universität Augsburg - 86135 Augsburg, Germany
3
Moscow Power Engineering Institute
14 Krasnokazarmennaya St., 105835 Moscow, Russia
Received:
14
October
1999
Accepted:
1
December
1999
Antiferromagnetic resonance (AFMR) experiments were performed in single crystals for Sr concentrations
. A
quasi-optical technique was employed in a frequency range
and for temperatures
. Two AFMR modes, a quasi-ferromagnetic (F) and a
quasi-antiferromagnetic
(AF) mode, were observed for temperatures below
. The resonance frequency
of the F-mode reveals a strong concentration dependence, while the AF-mode
frequency only slightly decreases on increasing x. The observed concentration
dependencies, as well as the excitation conditions for both modes, can be
explained using a simple two-sublattice model. These experiments provide
direct evidence in favour of a canted antiferromagnetic (CA) structure for
x < 0.1 and low temperatures and cannot be interpreted in terms of a phase
separation of ferromagnetic droplets in an antiferromagnetic matrix.
PACS: 75.30.Vn – Colossal magnetoresistance / 75.30.Ds – Spin waves / 76.50.+g – Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
© EDP Sciences, 2000
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