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Specific heat and magnetic relaxation of the quantum nanomagnetMn12Ac
Specific heat and magnetic relaxation of the quantum nanomagnetMn12Ac
- Source :
- Physical Review B. 57:5021-5024
- Publication Year :
- 1998
- Publisher :
- American Physical Society (APS), 1998.
-
Abstract
- We present specific-heat and ac-susceptibility measurements providing more evidence that magnetic quantum tunneling occurs in ${\mathrm{Mn}}_{12}$Ac spin clusters. The total anisotropy energy barrier determined by fitting an Arrhenius law to the magnetic relaxation time is underestimated when compared to the specific-heat data. The expected magnetic contribution using a quadratic spin Hamiltonian needs higher-order terms to improve the agreement with the experiments, as recently done for electron-paramagnetic-resonance spectra. In addition, another interesting effect was observed in the specific-heat measurements when a dc magnetic field is applied. The extra magnetic contribution due to Zeeman splitting is suppressed below the expected superparamagnetic blocking temperature in the time scale of the measurements.
Details
- ISSN :
- 10953795 and 01631829
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........1448b1e4f889b7663d809eecf1cc6556
- Full Text :
- https://doi.org/10.1103/physrevb.57.5021