Magnetic excitations, cluster modes and disorder phenomena in Rb2MnxCr1−xCl4
Identifieur interne : 000399 ( France/Analysis ); précédent : 000398; suivant : 000400Magnetic excitations, cluster modes and disorder phenomena in Rb2MnxCr1−xCl4
Auteurs : D. Sieger [Allemagne] ; H. Tietze [Allemagne] ; R. Geick [Allemagne] ; P. Schweiss [France] ; W. Treutmann [Allemagne] ; P. Frings [France]Source :
- Solid State Communications [ 0038-1098 ] ; 1987.
Abstract
In the random quasi-two-dimensional magnetic system Rb2MnxCr1−xCl4 with competing exchange interactions, the spectrum of magnetic excitations has been studied by means of neutron inelastic scattering, for a sample with ferromagnetic order (x=0.25) and for a sample with spin glass behaviour (x=0.59) at low temperatures. This investigation has revealed in both samples dispersionless Ising cluster modes, coexisting in the same frequency range with q-dependent spin wave branches. In the ferromagnetic sample, the spin wave branch extends above and below the frequency range of the Ising cluster modes. In the spin glass sample, ferromagnetic spin waves as well as antiferromagnetic ones have been found, in addition to the Ising cluster modes, at least for q-values where the wavelength is smaller than the two-dimensional correlationlength. Such an excitation spectrum as that observed in our sample of a quasi- two-dimensional XY spin glass has not yet been reported for any other spin glass.
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DOI: 10.1016/0038-1098(87)90349-8
Affiliations:
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This investigation has revealed in both samples dispersionless Ising cluster modes, coexisting in the same frequency range with q-dependent spin wave branches. In the ferromagnetic sample, the spin wave branch extends above and below the frequency range of the Ising cluster modes. In the spin glass sample, ferromagnetic spin waves as well as antiferromagnetic ones have been found, in addition to the Ising cluster modes, at least for q-values where the wavelength is smaller than the two-dimensional correlationlength. Such an excitation spectrum as that observed in our sample of a quasi- two-dimensional XY spin glass has not yet been reported for any other spin glass.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li><li>Île-de-France</li></region><settlement><li>Gif-sur-Yvette</li><li>Grenoble</li></settlement></list><tree><country name="Allemagne"><noRegion><name sortKey="Sieger, D" sort="Sieger, D" uniqKey="Sieger D" first="D." last="Sieger">D. Sieger</name></noRegion><name sortKey="Geick, R" sort="Geick, R" uniqKey="Geick R" first="R." last="Geick">R. Geick</name><name sortKey="Tietze, H" sort="Tietze, H" uniqKey="Tietze H" first="H." last="Tietze">H. Tietze</name><name sortKey="Treutmann, W" sort="Treutmann, W" uniqKey="Treutmann W" first="W." last="Treutmann">W. Treutmann</name></country><country name="France"><region name="Île-de-France"><name sortKey="Schweiss, P" sort="Schweiss, P" uniqKey="Schweiss P" first="P." last="Schweiss">P. Schweiss</name></region><name sortKey="Frings, P" sort="Frings, P" uniqKey="Frings P" first="P." last="Frings">P. Frings</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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