Phys. Rev. Lett. 89, 246401 (2002) [4 pages]Butterfly Hysteresis Loop at Nonzero Bias Field in Antiferromagnetic Molecular Rings: Cooling by Adiabatic MagnetizationSee Also: Erratum
At low temperatures, the magnetization of the molecular ferric wheel NaFe6 exhibits a step at a critical field Bc due to a field-induced level crossing. By means of high-field torque magnetometry we observed a hysteretic behavior at the level crossing with a characteristic butterfly shape which is analyzed in terms of a dissipative two-level model. Several unusual features were found. The nonzero bias field of the level crossing suggests the possibility of cooling by adiabatic magnetization. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.246401
DOI:
10.1103/PhysRevLett.89.246401
PACS:
71.70.–d, 33.15.Kr, 75.10.Jm
See AlsoErratum: O. Waldmann, R. Koch, S. Schromm, P. Müller, I. Bernt, and R. W. Saalfrank, Erratum: Butterfly Hysteresis Loop at Nonzero Bias Field in Antiferromagnetic Molecular Rings: Cooling by Adiabatic Magnetization [Phys. Rev. Lett. 89, 246401 (2002)], Phys. Rev. Lett. 90, 229904 (2003). |
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