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Spin pseudogap in the S=frac{1}{2} chain material Sr₂CuO₃ with impurities

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arxiv 1611.04183 v2 pith:LXE7SSIC submitted 2016-11-13 cond-mat.str-el

Spin pseudogap in the S=frac{1}{2} chain material Sr₂CuO₃ with impurities

G. Simutis , S. Gvasaliya , N. S. Beesetty , T. Yoshida , J. Robert , S. Petit , A. I. Kolesnikov , M. B. Stone
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F. Bourdarot H. C. Walker D.T. Adroja O. Sobolev C. Hess T. Masuda A. Revcolevschi B. B\"uchner A. Zheludev
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classification cond-mat.str-el
keywords chainpseudogapspinantiferromagneticca-impuritiescasescenterschains
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The low energy magnetic excitation spectrum of the Heisenberg antiferromagnetic $S = 1/2$ chain system Sr$_2$CuO$_3$ 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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