Nuclear spin-lattice relaxation in ferromagnetic EuO

Barak, J.; Gabai, A.; Kaplan, N.

doi:10.1103/physrevb.9.4914

Cited by 9 publications

(13 citation statements)

References 23 publications

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“…Using a similar derivation than the one leading to (14) in the paper of Barak et al, 43 we obtained: …”

Section: Appendix A: Three-magnon Relaxation Processmentioning

confidence: 73%

“…43 Also, between 14 K and 20 K, they observed that a three-magnon process surpasses the two-magnon process and that it is enhanced by a secondorder three-magnon process. The results we obtained at zero-field confirmed that, for temperatures above about 14 K, the three-magnon process is the dominant spinlattice relaxation process in EuO.…”

Section: A Spin-lattice Relaxation Timesmentioning

confidence: 99%

“…We then used the fact that the low energy spin waves give the principal part of the integral in (A1), 43 and we therefore determined g(ǫ ki ) by using the approximation ǫ k i = 2JSk 2 i a 2 . We obtained: …”

Section: Appendix A: Three-magnon Relaxation Processmentioning

confidence: 99%

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Magnetic properties of pure and Gd-doped EuO probed by NMR

et al. 2005

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An Eu NMR study in the ferromagnetic phase of pure and Gd doped EuO was performed. A complete description of the NMR lineshape of pure EuO allowed for the influence of doping EuO with Gd impurities to be highlighted. The presence of a temperature dependent static magnetic inhomogeneity in Gd doped EuO was demonstrated by studying the temperature dependence of the lineshapes. The results suggest that the inhomogeneity in 0.6% Gd doped EuO is linked to colossal magnetoresistance. The measurement of the spin-lattice relaxation times as a function of temperature led to the determination of the value of the exchange integral J as a function of Gd doping. It was found that J is temperature independent and spatially homogeneous for all the samples and that its value increases abruptly with increasing Gd doping.

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“…Using a similar derivation than the one leading to (14) in the paper of Barak et al, 43 we obtained: …”

Section: Appendix A: Three-magnon Relaxation Processmentioning

confidence: 73%

Section: A Spin-lattice Relaxation Timesmentioning

confidence: 99%

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Magnetic properties of pure and Gd-doped EuO probed by NMR

et al. 2005

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“…In this article, we present the results of measurements of the magnetic susceptibility and of the 9 Li NMR response of LiVSi 2 O 6 . Inspecting the temperature dependence of the magnetic susceptibility reveals no anomaly that would indicate the onset of magnetic order.…”

Section: Introductionmentioning

confidence: 99%

Quenching of the Haldane gap in LiVSi2O6 and related compounds

et al. 2007

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We report results of susceptibility χ and 7 Li NMR measurements on LiVSi2O6. The temperature dependence of the magnetic susceptibility χ(T ) exhibits a broad maximum, typical for lowdimensional magnetic systems. Quantitatively it is in agreement with the expectation for an S = 1 spin chain, represented by the structural arrangement of V ions. The NMR results indicate antiferromagnetic ordering below TN = 24 K. The intra-and interchain coupling J and Jp for LiVSi2O6, and also for its sister compounds LiVGe2O6, NaVSi2O6 and NaVGe2O6, are obtained via a modified random phase approximation which takes into account results of quantum Monte Carlo calculations. While Jp is almost constant across the series, J varies by a factor of 5, decreasing with increasing lattice constant along the chain direction. The comparison between experimental and theoretical susceptibility data suggests the presence of an easy-axis magnetic anisotropy, which explains the formation of an energy gap in the magnetic excitation spectrum below TN, indicated by the variation of the NMR spin-lattice relaxation rate at T ≪ TN.

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“…Barak et al (1974) have given values for the exchange integral ranging from 0·37 to 0·52 cm-1 which, with a spin of t, may be used in equation (36) …”

Section: Cos(tkya) +Cos(-!-kya)cos(tkza) +Cos(tkza)cos(-!-kxa)}]mentioning

confidence: 99%

Extended Theory of Magnon Sideband Shapes. I. Impure Three-dimensional Ferromagnets

Richardson¹

1976

Aust. J. Phys.

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A calculation of magnon sideband lineshapes is given which uses a simple phenomenological Hamiltonian allowing of an exact solution. The perturbation Hamiltonian has an improved form compared' with that used by Richardson (1974). We consider the effect of a small concentration of substitutional spin impurities on the sideband. An example of an f.c.c. ferromagnetic crystal is studied in detail, and the conditions for the appearance of local modes due to the impurity are discussed. The possibility of resonance modes occurring within the absmption band is considered but, for the f.c.c. crystal studied here, this appears to be unlikely to within the accuracy of the numerical calculations undertaken.

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Nuclear spin-lattice relaxation in ferromagnetic EuO

Cited by 9 publications

References 23 publications

Magnetic properties of pure and Gd-doped EuO probed by NMR

Magnetic properties of pure and Gd-doped EuO probed by NMR

Quenching of the Haldane gap in LiVSi2O6 and related compounds

Extended Theory of Magnon Sideband Shapes. I. Impure Three-dimensional Ferromagnets

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