Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-04-14
Phys. Rev. B, 66, no. 10, 104431 (2002)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 1 eps figure, RevTeX, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.66.104431
The magnetic strings in antiferromagnetic crystals with the spin $S = 1 /2$ differ from the magnetic polarons (ferrons) by the absence of the additional magnetic moment. We show that in the $S > 1 /2$ double exchange crystals with the antiferromagnetic $s-d$ exchange, a new type of magnetic strings appears, which possesses a magnetic moment. It is concentrated at the center of the string, and the magnetized string is, in its essence, the state intermediate between the string and the ferron. In antiferromagnetic manganites, this moment is by an order of magnitude larger than that of a magnetic atom. Unlike the conventional ferrons, the magnetization of the strings exists at any parameters of the crystals under consideration. We argue that this new type of magnetic state can be relevant to some doped antiferromagnets including manganites.
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