May 2017

Journal

Spin pseudogap in the S = 1/2 chain material Sr2CuO3 with impurities

By:
Simutis, Gediminas ; Gvasaliya, S. N.; Beesetty, N; Yoshida, Toru ; Robert, Julien; Petit, S; Kolesnikov, Alexander I; Stone, Matthew B; Bourdarot, F; Walker, H; Adroja, D. T.; Sobolev, O; Hess, C; Masuda, T; Revcolevschi, A.; Buchner, B; Zheludev, Andrey
Journal Name:
Physical Review B
Page Number:
54409
Volume:
95
Issue Number:
5
Publication Date:
May 2017
View DOI Listing:
https://doi.org/10.1103/PhysRevB.95.054409

Abstract

The low energy magnetic excitation spectrum of the Heisenberg antiferromagnetic S = 1=2 chain system Sr2CuO3 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.