Principles of Neutron Scattering

Böni, P.; Furrer, A.; Schefer, Jürg

doi:10.1142/9789812792150_0001

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…Due to the spin of the neutron, there is a strong interaction between the magnetic moment of the neutron and the magnetic field created by the unpaired electrons in the sample. Measuring the INS intensity as a function of momentum and energy transfer provides useful information on the magnetic scattering function, S (Q,ω), which contains the details of the magnetic exchange interactions and anisotropy splittings . Thus far, none of the above experimental studies has provided direct information on the nature and energies of energy splitting in the ground state of 1 .…”

Section: Resultsmentioning

confidence: 99%

Studies of an Enneanuclear Manganese Single-Molecule Magnet

et al. 2005

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The reaction of [Mn(3)O(O(2)CMe)(6)(py)(3)] with the tripodal ligand H(3)thme (1,1,1-tris(hydroxymethyl)ethane) affords the enneanuclear complex [Mn(9)O(7)(O(2)CCH(3))(11)(thme)(py)(3)(H(2)O)(2)] 1.1MeCN.1Et(2)O. The metallic skeleton of complex 1 comprises a series of 10 edge-sharing triangles that describes part of an idealized icosahedron. Variable temperature direct current (dc) magnetic susceptibility data collected in the 1.8-300 K temperature range and in fields up to 5.5 T were fitted to give a spin ground state of S = (17)/(2) with an axial zero-field splitting parameter D = -0.29 cm(-)(1). Ac susceptibility studies indicate frequency-dependent out-of-phase signals below 4 K and an effective barrier for the relaxation of the magnetization of U(eff) = 27 K. Magnetic measurements of single crystals of 1 at low temperature show time- and temperature-dependent hysteresis loops which contain steps at regular intervals of field. Inelastic neutron scattering (INS) studies on complex 1 confirm the S = (17)/(2) ground state and analysis of the INS transitions within the zero-field split ground state leads to determination of the axial anisotropy, D = -0.249 cm(-)(1), and the crystal field parameter, B(4)(0) = 7(4) x 10(-)(6) cm(-)(1). Frequency domain magnetic resonance spectroscopy (FDMRS) determined the same parameters as D = -0.247 cm(-)(1) and B(4)(0) = 4.6 x 10(-)(6) cm(-)(1). DFT calculations are fully consistent with the experimental findings of two Mn(II) and four Mn(III) ions "spin up" and three Mn(IV) ions "spin down" resulting in the S = (17)/(2) spin ground state of the molecule, with D = -0.23 cm(-)(1) and U = 26.2 K.

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Section: Resultsmentioning

confidence: 99%

Studies of an Enneanuclear Manganese Single-Molecule Magnet

et al. 2005

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“…Due to the spin of the neutron, there is a strong interaction between the magnetic moment of the neutron and the magnetic field created by the unpaired electrons in the sample. as a function of momentum and energy transfer provides useful information on the magnetic scattering function S(Q, x), which contains the details about the magnetic exchange interactions and anisotropy splittings [6]. The focus of the present study is aimed at the determination of the anisotropy splitting of the ground state of 1.…”

Section: Smmmentioning

confidence: 99%

Inelastic neutron scattering study of undeuterated [Mn9O7(OAc)11(thme)(py)3(H2O)2]

et al. 2005

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We report on the magnetic properties of the enneanuclear mixed-valent single-molecule magnet [Mn 9 O 7 (OAc) 11 (thme)-(py) 3 (H 2 O) 2 ] (1). Using inelastic neutron scattering (INS) spectroscopy, we have confirmed the S = 17/2 cluster ground state of 1. Furthermore, we have determined accurately the anisotropy parameters of the zero field split ground state. The cluster 1 exhibits a strong negative axial anisotropy D½Ŝ 2 z À SðS þ 1Þ=3 where D = À0.249(5) cm À1. It is necessary to include an axial higher order term ðB 0 4 Þ in the effective spin Hamiltonian to account for the experimental data.

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Principles of Neutron Scattering

Cited by 2 publications

References 1 publication

Studies of an Enneanuclear Manganese Single-Molecule Magnet

Studies of an Enneanuclear Manganese Single-Molecule Magnet

Inelastic neutron scattering study of undeuterated [Mn9O7(OAc)11(thme)(py)3(H2O)2]

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