Hourglass dispersion in overdoped single-layered manganites
H. Ulbrich, P. Steffens, D. Lamago, Y. Sidis, M. Braden
TL;DR
This paper investigates the hourglass-shaped magnetic excitation spectrum in overdoped single-layered manganites, revealing that magnetic correlation length is key to shaping the dispersion pattern.
Contribution
It demonstrates that magnetic correlation length determines the hourglass dispersion shape in overdoped manganites, providing new insight into magnetic excitations in these materials.
Findings
Magnetic excitation spectrum resembles that in cuprate superconductors.
Large magnetic correlation length suppresses outward-dispersing branches.
Magnetic correlation length is crucial for hourglass shape formation.
Abstract
The excitation spectrum in single-layered Nd(0.33)Sr(1.67)MnO4 and Pr(0.33)Ca(1.67)MnO4 resembles the hourglass-like excitation dispersion seen in various cuprates superconductors. However, our spin-wave dispersion in Pr(0.33)Ca(1.67)MnO4, which exhibits a large correlation length of the magnetic order, showing outward-dispersing branches starting from the incommensurate zone-centres. The magnetic correlation length is identified as the decisive parameter to suppress this branches and generating an correct hourglass shape.
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