Frustration Effects in Magnetic Molecules
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Besides being a fascinating class of new materials, magnetic molecules provide the opportunity to study concepts of condensed matter physics in zero dimensions. This contribution will exemplify the impact of molecular magnetism on concepts of frustrated spin systems. We will discuss spin rings and the unexpected rules that govern their low-energy behavior. Rotational bands, which are experimentally observed in various molecular magnets, provide a useful, simplified framework for characterizing the energy spectrum, but there are also deviations thereof with far-reaching consequences. It will be shown that localized independent magnons on certain frustrated spin systems lead to giant magnetization jumps, a new macroscopic quantum effect. In addition a frustration-induced metamagnetic phase transitions will be discussed, which demonstrates that hysteresis can exist without anisotropy. Finally, it is demonstrated that frustrated magnetic molecules could give rise to an enhanced magnetocaloric effect.
PACS numbers75.50.Xx 75.10.Jm 75.40.Cx
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- 2.Müller A. et al. (2001). Chem. Phys. Chem. 2:517Google Scholar
- 6.K. Bärwinkel, P. Hage, H.-J. Schmidt, and J. Schnack, Phys. Rev. B 68, 054422 (2003).Google Scholar
- 7.M. Karbach, Ph.D. thesis, Bergische Universität - Gesamthochschule Wuppertal, 1994.Google Scholar
- 10.J. Schnack and M. Luban, Phys. Rev. B 63, 014418 (2001).Google Scholar
- 11.O. Waldmann et al., Phys. Rev. Lett. 91, 237202 (2003).Google Scholar
- 13.J. Schulenburg et al. Phys. Rev. Lett. 88, 167207 (2002).Google Scholar
- 15.C. Schröder et al., Phys. Rev. Lett. 94, 207203 (2005).Google Scholar
- 16.M. E. Zhitomirsky and A. Honecker, J. Stat. Mech.: Theor. Exp. 2004, P07012 (2004).Google Scholar
- 17.O. Derzhko and J. Richter, Phys. Rev. B 70, 104415 (2004).Google Scholar
- 18.J. Schnack, R. Schmidt, and J. Richter, in preparation.Google Scholar