Large nonzero-moment magnetic strings in antiferromagnetic crystals of the manganite type

摘要

The magnetic strings in antiferromagnetic crystals with the spin $S = 1 /2$differ from the magnetic polarons (ferrons) by the absence of the additionalmagnetic moment. We show that in the $S > 1 /2$ double exchange crystals withthe antiferromagnetic $s-d$ exchange, a new type of magnetic strings appears,which possesses a magnetic moment. It is concentrated at the center of thestring, and the magnetized string is, in its essence, the state intermediatebetween the string and the ferron. In antiferromagnetic manganites, this momentis by an order of magnitude larger than that of a magnetic atom. Unlike theconventional ferrons, the magnetization of the strings exists at any parametersof the crystals under consideration. We argue that this new type of magneticstate can be relevant to some doped antiferromagnets including manganites.