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  • American Institute of Physics (AIP)  (24)
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  • 1
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance of Mn2+ in FeSiF6⋅6H2O and FeSiF6⋅6D2O above 100 K (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 92-94 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In electron paramagnetic resonance measurements on Mn2+ in single crystals of FeSiF6⋅6H2O and FeSiF6⋅6D2O at 9.3 GHz, changes in the resolution of the outer sets of hyperfine lines were used to observe the trigonal to monoclinic structural phase transition, which occurred over the range 223–227 K in both crystals. The magnitude of the axial spin-Hamiltonian parameter D for FeSiF6⋅6D2O was (273±1)×10−4 cm−1 at 300 K and decreased slightly with decreasing temperature in the trigonal phase. In the monoclinic phase ||D|| was (263±1)×10−4 cm−1 at 220 K and increased slightly with decreasing temperature. Similar values were obtained for FeSiF6⋅6H2O. An abrupt linewidth increase on warming through the transition is postulated to result from a decrease in the effective Mn2+–Fe2+ exchange interaction due to SiF2−6 reorientation. A gradual decrease in linewidth with temperature at higher temperatures is ascribed to a reduction of the second moment of the Mn2+–Fe2+ dipolar interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454489
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of the EPR zero-field splitting of Mn2+ in ZnSiF6⋅6H2O (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3801-3803 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature dependence of the EPR spectrum of Mn2+ in ZnSiF6⋅6H2O was measured at 9.2 GHz between 15 and 297 K. Both the g and A tensors were found to be isotropic with values close to 2.000 and −90×10−4 cm−1, respectively. A slight decrease in the magnitude of A with increasing temperature was observed. The zero-field splitting parameters D and a–F were found to vary from −130.5×10−4 and 9.9×10−4 cm−1, respectively, at 15 K to −170.2×10−4 and 7.8×10−4 cm−1, respectively, at 297 K. The data for D below 100 K were fitted to the orbit–lattice interaction in the long-wavelength approximation with a Debye temperature of 138 K. An estimate of the low-temperature ratio of D for Ni2+ and Mn2+ in ZnSiF6⋅6H2O based on the long-wavelength fits was in good agreement with the measured ratio of 10 at 4 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451937
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature dependence of the g value of Ni2+ in ZnSiF6⋅6H2O (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 705-706 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The measured increase in g(parallel) between 4 and 100 K for Ni2+ in ZnSiF6⋅H2O has been explained as a consequence of the dynamical phonon coupling between the spins and the lattice. The Debye temperature of θ=130 K previously determined from the zero-field splitting has been found to agree with that obtained from the temperature dependence of the g value. The zero-point vibrational correction to the g value has been deduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454148
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  • 4
    Electronic Resource
    Electronic Resource
    The temperature dependence of the EPR spectrum of Cu2+ in ZnTiF6⋅6H2O between 4 and 160 K (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6660-6664 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The EPR spectrum of Cu2+ in the low temperature monoclinic phase of ZnTiF6⋅6H2O was studied at 9.24 GHz between 4 and 160 K. Assuming the Jahn–Teller spectra to have axial symmetry, g(parallel) was found to vary from 2.472±0.004 at 4 K to 2.331±0.004 at 158 K, while g⊥ varied from 2.097±0.004 to 2.173±0.004 over this range. From the temperature variations of the g values, the lowering of the energy Δ of one potential well associated with the Jahn–Teller distortion compared to the other two was found to be approximately 143 cm−1. It is shown that an apparent decrease in Δ with increasing temperature above 100 K could be due to the presence of an excited vibronic state about 170 cm−1 above the ground state. The variation of ||A(parallel)|| from (107±1)×10−4 cm−1 at 4 K to (53±3)×10−4 cm−1 at 158 K agreed with predictions based on the temperature variation of the g tensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452413
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  • 5
    Electronic Resource
    Electronic Resource
    Phase transitions in ZnTiF6⋅6H2O observed by the electron paramagnetic resonance of Mn2+ (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3614-3617 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature dependence and hysteresis of the trigonal–monoclinic phase transition occurring near 180 K in ZnTiF6⋅6H2O were studied as functions of Mn concentration, and spin–Hamiltonian parameters were determined in both the trigonal and monoclinic phases. Changes in the 9 GHz electron paramagnetic resonance (EPR) spectrum between 30 and 10 K indicated a first order phase transition on cooling to a more disordered structure. Additional lines showing ligand hyperfine structure, with an even number of components, are attributed to paramagnetic impurities occupying Ti4+ sites with single F− vacancies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456893
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of Debye temperature from the zero-field splitting of Ni2+ in ZnSiF6⋅6H2O (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 634-636 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The variation of the zero-field splitting parameter D for Ni2+ in ZnSiF6⋅6H2O between 4 and 250 K has been used to calculate the temperature dependence of the Debye temperature θD(T) in ZnSiF6⋅6H2O. θD(T) was determined to be 143 K at a temperature of 30 K and 127 K at 250 K. There was a pronounced minimum of 105 K in θD(T) near 60 K. The behavior of θD(T) is qualitatively similar to that found for alkali halides from specific heat data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454190
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  • 7
    Electronic Resource
    Electronic Resource
    The temperature dependence of the EPR spectrum of Mn2+ in ZnSiF6 ⋅ 6D2O (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1699-1700 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The EPR spectrum of Mn2+ in ZnSiF6 ⋅ 6D2O was measured at 9.2 GHz between 25 and 300 K. The g tensor was essentially isotropic and temperature independent with all measured values in the range 2.000 to 2.001. The zero-field splitting parameters D and (a−F) were −(170.4±0.3)×10−4 and +(7.9±0.2)×10−4 cm−1, respectively, at 300 K and −(132.2±0.5)×10−4 cm−1 and +(9.3±0.3)×10−4 cm−1, respectively, at 50 K. The hyperfine tensor A, which was isotropic to within the experimental errors, varied from −(89.6±0.2)×10−4 cm−1 at 300 K to −(90.1±0.2)×10−4 cm−1 at 50 K. The temperature dependence of D was qualitatively similar to that measured for Ni2+ in the same crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451163
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic resonance of two-dimensional Heisenberg antiferromagnets with nonmagnetic impurities : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7010-7011 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The EPR linewidths of (C3H7NH3)2Mn1−xCdxCl4 have been measured in the paramagnetic region as a function of temperature. An Arrhenius behavior exp(b/T) is observed with b strongly dependent on Cd concentration. This behavior in the pure compound is characteristic of soliton-like (skyrmion) excitations with b related to the excitation energy. In the doped compound, gapless nonlinear excitations are possible, resulting in a much different temperature-dependent linewidth. It is concluded that skyrmions dominate the low-temperature thermodynamics of two-dimensional magnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352413
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  • 9
    Electronic Resource
    Electronic Resource
    Microwave magnetic resonances in the one-dimensional ferromagnet FeTAC : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6977-6979 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic resonance spectra at 12–36 GHz are reported for Fe2+(3d6, S=2) in the 1D Ising ferromagnet [(CH3)3NH]FeCl3⋅2H2O, known as FeTAC, between 2.5 and 13 K. The main signal was identified as a spin-cluster resonance (SCR) because of its characteristic temperature dependence below 6 K and the linear dependence of the resonance field on the microwave frequency for H parallel to the easy axis at 4.2 K. The temperature dependence of the line intensity was fitted to the function exp[−(2J+hν)/kBT], with 2J/kB=(41±1) K, and the linear field dependence was explained by the value gz=8.26±0.05 in the S=1/2 representation and a demagnetization field of several hundred gauss, which depended on the sample shape. A frequency-dependent satellite structure observed on the low field side of the main line, which appeared as a broad line below 15 GHz, is tentatively associated with energy shifts of the lower-lying spin-cluster states produced by the magnetic dipole interaction and other terms in the Hamiltonian.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352403
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of exchange anisotropy on susceptibility of one-dimensional spin 1/2 ferromagnets : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5094-5095 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied several quasi-one-dimensional spin 1/2 ferromagnets ranging from Heisenberg to Ising anisotropy to test the Johnson and Bonner prediction that the low temperature thermodynamic behavior of these systems in external fields depends on the exchange anisotropy and that there are certain ranges of the anisotropy and fields in which bound magnons or spin waves dominate thermodynamic properties. The experimental results confirm that for the samples tested bound magnons dominate susceptibility across available range of the anisotropy (γ〈1.05) and for fields up to 9 T near the Heisenberg limit. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362697
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