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The reaction of Sr2CuO3 with air and liquid water was studied to address theorigin of the reported variable Curie-Weiss impurity contribution to themagnetic susceptibility X of this compound at low temperatures. Sr2CuO3 wasfound to decompose upon exposure to either of these environments. The compoundSr2Cu(OH)6 was identified as the primary reaction product. A pure sample ofSr2Cu(OH)6 was then prepared separately. Electron paramagnetic resonance (EPR),isothermal magnetization versus magnetic field M(H) and X versus temperature Tmeasurements demonstrate that Sr2Cu(OH)6 contains weakly interacting Cu+2magnetic moments with spin S = 1/2 and average g-factor 2.133. From a fit ofX(T) by the Curie-Weiss law and of the M(H) isotherms by modified Brillouinfunctions, the exchange interaction between adjacent Cu+2 spins was found to beJ/kB = -1.06(4)K, a weakly antiferromagnetic interaction. Our results indicatethat the previously reported, strongly sample-dependent, Curie-Weisscontribution to X(T) of a polycrystalline Sr2CuO3 sample most likely arisesfrom exposing the sample to air, resulting in a variable amount of paramagneticSr2Cu(OH)6 on the surface of the sample.Comment: 10 pages, 12 figures, RevTex 4, submitted to Physical Review

physical review. b, condensed matter

Decomposition of the spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>Heisenberg chain compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi …

Decomposition of the spin-12Heisenberg chain compoundSr2