Spin pseudogap in the $S=\frac{1}{2}$ chain material Sr$_2$CuO$_3$ with impurities
G. Simutis, S. Gvasaliya, N. S. Beesetty, T. Yoshida, J. Robert, S., Petit, A. I. Kolesnikov, M. B. Stone, F. Bourdarot, H. C. Walker, D.T., Adroja, O. Sobolev, C. Hess, T. Masuda, A. Revcolevschi, B. B\"uchner, and A., Zheludev
TL;DR
This study investigates how impurities affect the magnetic excitation spectrum of the $S=1/2$ chain compound Sr$_2$CuO$_3$, revealing a defect-induced pseudogap that scales with impurity concentration.
Contribution
It provides the first neutron spectroscopy analysis of impurity effects on the magnetic spectrum of Sr$_2$CuO$_3$, demonstrating a proportional relationship between pseudogap size and impurity count.
Findings
Impurities induce a spectral pseudogap in Sr$_2$CuO$_3$.
The pseudogap scales with the number of scattering centers.
Impurities modify the low-energy magnetic excitations.
Abstract
The low energy magnetic excitation spectrum of the Heisenberg antiferromagnetic chain system SrCuO with Ni- and Ca-impurities is studied by neutron spectroscopy. In all cases, a defect-induced spectral pseudogap is observed and shown to scale proportionately to the number of scattering centers in the spin chains.
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