A classification of spin frustration in molecular magnets from a physical study of large odd-numbered-metal, odd electron rings

作者：Baker Michael L; Timco Grigore A; Piligkos Stergios; Mathieson Jennifer S; Mutka Hannu; Tuna Floriana; Kozlowski Piotr; Antkowiak Michal; Guidi Tatiana; Gupta Tulika; Rath Harapriya; Woolfson Robert J; Kamieniarz Grzegorz; Pritchard Robin G; Weihe Hogni; Cronin Leroy; Rajaraman Gopalan; Collison David; McInnes Eric J L; Winpenny Richard E P^*

来源：Proceedings of the National Academy of Sciences, 2012, 109(47): 19113-19118.

DOI：10.1073/pnas.1213127109

• Chromium
• inelastic neutron scattering
• molecular magnetism
• density functional theory
• magnetic measurements

The term %26quot;frustration%26quot; in the context of magnetism was originally used by P. W. Anderson and quickly adopted for application to the description of spin glasses and later to very special lattice types, such as the kagome. The original use of the term was to describe systems with competing antiferromagnetic interactions and is important in current condensed matter physics in areas such as the description of emergent magnetic monopoles in spin ice. Within molecular magnetism, at least two very different definitions of frustration are used. Here we report the synthesis and characterization of unusual nine-metal rings, using magnetic measurements and inelastic neutron scattering, supported by density functional theory calculations. These compounds show different electronic/magnetic structures caused by frustration, and the findings lead us to propose a classification for frustration within molecular magnets that encompasses and clarifies all previous definitions.

• 出版日期2012-11-20