2002
DOI: 10.1103/physrevb.66.161407
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Abstract: The question addressed in this paper is that of the influence of the density of dislocations on the spin tunneling in Mn 12 clusters. We have determined the variation in the mosaicity of fresh and thermally treated single crystals of Mn 12 by analyzing the widening of low angle x-ray diffraction peaks. It has also been well established from both isothermal magnetization and relaxation experiments that there is a broad distribution of tunneling rates which is shifted to higher rates when the density of dislocat… Show more

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Cited by 18 publications
(28 citation statements)
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“…For instance, such interaction can induce and modulate the off-diagonal terms in the Hamiltonian ͑i.e., not commuting with the spin projection S z along the anisotropy axis͒ that account for the quantum-tunneling magnetization in these molecules. [3][4][5] Moreover, the influence of the environment turns out to be decisive for the appearance of a second species of Mn 12 molecules showing faster relaxation. This species has been associated with the presence of an anomalous Jahn-Teller distortion.…”
Section: Introductionmentioning
confidence: 96%
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“…For instance, such interaction can induce and modulate the off-diagonal terms in the Hamiltonian ͑i.e., not commuting with the spin projection S z along the anisotropy axis͒ that account for the quantum-tunneling magnetization in these molecules. [3][4][5] Moreover, the influence of the environment turns out to be decisive for the appearance of a second species of Mn 12 molecules showing faster relaxation. This species has been associated with the presence of an anomalous Jahn-Teller distortion.…”
Section: Introductionmentioning
confidence: 96%
“…First, the disorder that arises from lattice defects such as dislocations. 3,4 And second, the disorder induced by the local orientation of interstitial molecules from the crystallization process. 5 The preparation of crystalline samples of SMMs with controlled structural parameters, such as morphology, size, and crystallographic phase, will represent an excellent scenario to study the influence of these structural parameters on the magnetization relaxation mechanisms.…”
Section: Introductionmentioning
confidence: 99%
“…The symmetry of the molecule is the first step in the understanding its energy level structure and quantum tunneling. However, in many SMMs, including Mn 12 , the magnetic properties do not reflect the molecule site-symmetry [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. …”
mentioning
confidence: 99%
“…Recent experimental results suggest that there is a distribution of tunneling splittings associated with disorder in Mn 12 -acetate [16,17]. Chudnovsky and Garanin [14] proposed that random line dislocations in a crystal lead, via magnetoelastic interactions, to a lower molecule symmetry and a broad distribution of tunneling rates.…”
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confidence: 99%
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