Broad line-width of antiferromagnetic spinwave due to electrons correlation

We study magnetic excitations in a bilayer of an antiferromagnetic (AF) insulator and a correlated metal, in which double occupancy is forbidden. The effective action of the AF spin wave in the AF insulator is derived by using the path integral formula within the second order of interplane coupling....

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Bibliographic Details
Published inarXiv.org
Main Author Mori, Michiyasu
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 09.11.2017
Subjects
Antiferromagnetism
Correlation analysis
Electrons
Excitation
Ferrimagnetism
Hole density
Integrals
Magnons
Occupancy
Particle spin
Physics - Strongly Correlated Electrons
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Summary:We study magnetic excitations in a bilayer of an antiferromagnetic (AF) insulator and a correlated metal, in which double occupancy is forbidden. The effective action of the AF spin wave in the AF insulator is derived by using the path integral formula within the second order of interplane coupling. The electron correlation in the correlated metal is treated by the Gutzwiller approximation, which renormalizes the hopping integrals by g_t as proportional to the hole density. The linewidth of the AF spin wave excitations originates from particle-hole excitations in the correlated metal. By increasing the correlation effect, i.e., by decreasing g_t, it is found that the linewidth at low energies increases inversely proportional to g_t. The present results will also be useful for bilayers of a metal and ferrimagnet.
ISSN:2331-8422
DOI:10.48550/arxiv.1707.03523