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

TL;DR

This paper introduces a new magnetic string state in antiferromagnetic manganite crystals with S > 1/2, characterized by a significant magnetic moment at the string's center, differing from traditional ferrons.

Contribution

It reveals the existence of magnetized magnetic strings with a central magnetic moment in S > 1/2 antiferromagnetic crystals, expanding understanding of magnetic states in doped manganites.

Findings

Magnetic strings in S > 1/2 crystals have a central magnetic moment.

The magnetized strings are intermediate between strings and ferrons.

Magnetization persists across various crystal parameters.

Abstract

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.