Regular versus alternating (FeS4)(n) chains: Magnetism in KFeS2 and CsFeS2

Tiwary, Satish K and Vasudevan, Sukumaran (1997) Regular versus alternating (FeS4)(n) chains: Magnetism in KFeS2 and CsFeS2. In: Physical Review B: Condensed Matter, 56 (13). pp. 7812-7814.

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Abstract

We report crystal magnetic susceptibility results of two S = 1/2 one-dimensional Heisenberg antiferromagnets, KFeS2 and CsFeS2. Both compounds consist of (FeS4)(n) chains with an average Fe-Fe distance of 2.7 Angstrom. In KFeS2, all intrachain Fe-Fe distances are identical. Its magnetic susceptibility is typical of a regular antiferromagnetic chain with spin-spin exchange parameter J = -440.7 K. In CsFeS2, however, the Fe-Fe distances alternate between 2.61 and 2.82 Angstrom. This is reflected in its magnetic susceptibility, which could be fitted with J = -640 K, and the degree of alternation, alpha = 0.3. These compounds form a unique pair, and allow for a convenient experimental comparison of the magnetic properties of regular versus alternating Heisenberg chains.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	30 Jun 2011 13:33
Last Modified:	30 Jun 2011 13:35
URI:	http://eprints.iisc.ac.in/id/eprint/38383

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