Tetramethylammonium Copper Chloride andtris(Trimethylammonium) Copper Chloride: $S = \frac{1}{2}$ Heisenberg One-Dimensional Ferromagnets

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6 August 1979

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 43 (6) , 463-466
https://doi.org/10.1103/physrevlett.43.463

Abstract

The magnetic susceptibilities of powdered samples of

{Me}_{4}

NCu

{Cl}_{3}

(TMCuC) and [(C

H_{3}

)

{}_{3}{NH}

]

{}_{3}{Cu}_{2}

{Cl}_{7}

(TTMCuC) have been measured. Both compounds behave like one-dimensional

S = \frac{1}{2}

Heisenberg ferromagnets which are weakly coupled antiferromagnetically to adjacent chains. For TMCuC, we obtained

\frac{J}{k} = 30

K with

| J^{'} | ≲ 0.003

K; the ratio

| \frac{J^{'}}{J} |

is the lowest yet found for a ferromagnetic

S = \frac{1}{2}

chain. For TTMCuC, we obtained

\frac{J_{FM}}{k} = 50

K, with

| \frac{J^{'}}{J_{FM}} | ≲ 10^{- 4}

, and

\frac{J_{AFM}}{k} = - 10

K for the antiferromagnetic chains also present.

Keywords

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