Experimental Evidence of a Haldane Gap in anS=2Quasi-Linear-Chain Antiferromagnet
| Autor: | Daniel R. Talham, G. E. Granroth, Th. Jolicoeur, B. H. Ward, Mark W. Meisel, M. Chaparala |
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| Rok vydání: | 1996 |
| Předmět: |
Physics
Condensed matter physics Crystal orientation General Physics and Astronomy Order (ring theory) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic susceptibility Magnetization Chain (algebraic topology) 0103 physical sciences Antiferromagnetism Quasi linear 010306 general physics 0210 nano-technology Critical field |
| Zdroj: | Physical Review Letters. 77:1616-1619 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.77.1616 |
| Popis: | The magnetic susceptibility of the $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2$ quasi-linear-chain Heisenberg antiferromagnet (2,2\ensuremath{'}-bipyridine)trichloromanganese(III) has been measured from 1.8 to 300 K with the magnetic field $H$ parallel and perpendicular to the chains. The analyzed data yield $g\ensuremath{\approx}2$ and $J\ensuremath{\approx}35\mathrm{K}$. The magnetization $M$ has been studied at 30 mK and 1.4 K in $H$ up to 16 T. No evidence of long-range order is observed. Depending on crystal orientation, $M\ensuremath{\approx}0$ at 30 mK until a critical field is achieved ( ${H}_{c\ensuremath{\Vert}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.2\ifmmode\pm\else\textpm\fi{}0.2\mathrm{T}$ and ${H}_{c\ensuremath{\perp}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\ifmmode\pm\else\textpm\fi{}0.2\mathrm{T}$), where $M$ increases continuously as $H$ is increased. These results are interpreted as evidence of a Haldane gap. |
| Databáze: | OpenAIRE |
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