S=1/2 Heisenberg antiferromagnetic spin chain [Cu(dmbpy)(H2O)(2)SO4] (dmbpy=4,4 '-dimethyl-2,2 '-bipyridine): Synthesis, crystal structure and enhanced magnetocaloric effect

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10271608" target="_blank" >RIV/00216208:11320/14:10271608 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.solidstatesciences.2013.12.003" target="_blank" >http://dx.doi.org/10.1016/j.solidstatesciences.2013.12.003</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.solidstatesciences.2013.12.003" target="_blank" >10.1016/j.solidstatesciences.2013.12.003</a>

Result language
angličtina
Original language name
S=1/2 Heisenberg antiferromagnetic spin chain [Cu(dmbpy)(H2O)(2)SO4] (dmbpy=4,4 '-dimethyl-2,2 '-bipyridine): Synthesis, crystal structure and enhanced magnetocaloric effect
Original language description
[Cu(dmbpy)(H2O)(2)SO4] in the form of small blue crystals was prepared from the aqueous-ethanolic reaction mixture formed of CuSO4 and dmbpy (dmbpy = 4,4'-dimethyl-2,2'-bipyridine). Its crystal structure consists of chains in which hexacoordinated Cu(II)atoms are linked by (mu(2)-SO4)(2-) anions. The Cu(II) atom exhibits elongated tetragonal bipyramidal coordination with one chelate bonded dmbpy and two aqua ligands placed in the equatorial plane while the axial positions are occupied by bridging sulfato ligands. The study of electron spin resonance and specific heat enabled to identify the studied material as an S = 1/2 Heisenberg antiferromagnetic chain with weak intrachain exchange interaction, 2J/k(B) = -1.12 K and a small anisotropy of g - factor, Delta g/g approximate to 0.1. The analysis of the magnetic entropy revealed pronounced release of the entropy at the saturation magnetic field, which for spin chains induces quantum phase transition, namely B-sat = 1.56 T. The maximum i
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
<a href="/en/project/LM2011025" target="_blank" >LM2011025: MLTL - Magnetism and Low Temperature Laboratories - operation and development of national research infrastructure</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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