Hyperfine Fields at Solutes in Ferromagnets: Cadmium and Ruthenium in Nickel

Shirley, D. A.; Rosenblum, S. S.; Matthias, E.

doi:10.1103/physrev.170.363

Cited by 209 publications

(37 citation statements)

References 36 publications

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“…Figure 4 presents the central frequencies and the magnetisation data normalised to their values at 4.2 K, for a comparison. The dashed lines show the fits of the temperature dependence of the Mo resonant frequency ν, which represents HF related to the mean value of the z-th component of the Mo spin, S z [51,20]. Considering the T 3/2 and T 5/2 terms of a Bloch temperature dependence [52], a better fit of ν (twice smaller χ 2 ) is obtained for the…”

Section: Molybdenum Nmr Results and Discussionmentioning

confidence: 99%

Local Magnetic and Electronic Properties of the A2FeM'O6 (A = Ba, Sr, Ca, M' = Mo, Re) Double Perovskites

et al. 2007

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The results of a combined NMR, X-ray absorption spectroscopy and X-ray magnetic circular dichroism study of the AA FeMoO6 and AA FeReO6 double perovskites are presented. They revealed a dependence of electronic and magnetic properties, including a d-electron transfer between Fe and Mo sites, on the structural tolerance factor. The maximum value of the 4d Mo electron occupation and the corresponding Mo moment is obtained for the tolerance factor of unity. This corresponds to the maximum strength of the magnetic interaction and, respectively, to the Curie temperature. The dominant T 5/2 type temperature dependence of the Mo hyperfine field reveals the half-metallicity of the AA FeMoO 6 compounds. Antisite defects and antiphase boundaries have been identified in NMR measurements and the strength of their magnetic coupling have been determined. A considerable orbital contribution to the Re and Fe magnetic moments were found in the NMR and X-ray magnetic circular dichroism measurements on the AA FeReO6 compounds. Its magnitude decreases with increasing structural tolerance factor and is correlated with their magnetic anisotropy. IntroductionDouble perovskites (DP) of a general formula A 2 MM O 6 , where A is an alkaline earth, and M and M are 3d, 4d, and/or 5d transition metals belong to a very broad family of oxide compounds crystallising in the perovskite structure. They exhibit intriguing magnetic and electronic properties including half metallicity, a considerable low field magnetoresistance (LFMR) and a variety of magnetic structures, see review paper [1]. Magnetic and electronic properties are closely interrelated, due to the same (d) character of the "magnetic" and "conduction" electrons. Exchange interactions can occur between ions of the same element, as e.g. in manganese perovskites, as well as between ions of different elements, as e.g. in double perovskites. The interplay of lattice, charge, and spin degrees of freedom causes a variety of electronic and magnetic properties ranging from a metallic ferro-or ferrimagnetism to antiferromagnetic or paramagnetic insulating behaviour. This also brings about the magnetoresistive properties of the compounds.The interplay between magnetic and electronic transport properties in these systems can be controlled by substitution of alkaline earths (e.g. Ba, Sr, Ca) or lanthanides (e.g. La, Pr, Nd) in the A-site, as well as by the substitution of transition metals (e.g. Fe, Cr, Mn, Mo, Rh, Ru, W, Re). Among the double perovskites, the Fe-Mo and Fe-Re compounds, which are the subject of the study presented in this paper, have recently attracted a great deal of interest among the researchers. Their relatively high magnetic ordering temperature (in most cases higher than the room temperature) compared to that of manganese perovskites, and a significant LFMR make them especially interesting for applications, e.g. in magnetoelectronics or spintronics. The LFMR is explained in terms of intergranular tunneling MR (ITMR), and is related to the half-metallic nature of the ground...

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Section: Molybdenum Nmr Results and Discussionmentioning

confidence: 99%

Local Magnetic and Electronic Properties of the A2FeM'O6 (A = Ba, Sr, Ca, M' = Mo, Re) Double Perovskites

et al. 2007

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“…As metallic nickel is a ferromagnet, the field strength at the excited 62Cu nuclei depends strongly on the magnetization M of the surrounding lattice, which itseff changes with temperature T and with the externally applied field B~x t. If B~x t is strong enough to line up all magnetization directions perpendicular to the beam-detector plane, the field present at the nuclei of nonmagnetic ions like Cu in Ni is given [5,[11][12][13] by…”

Section: R(t) I(ot)-i(o+90 ~mentioning

confidence: 99%

Lifetimes and magnetic moments of two states in62Cu

et al. 1973

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The lifetimes and the magnetic moments of the two excited 62Cu states at 40.84 and 390.19 keV are investigated by time differential perturbed angular distribution measurements of the delayed y-rays following the nuclear reactions 61Ni(d, n) and 62Ni (p, n). The results are: r=6.7_ 0.5 nsec,/t= 1.32_ 0.03 n. m. for the 2 + state at 40.84 keV, and T= 16.0_ 0.3 nsec,/t=2.00+ 0.01 n. m. for the 3 + state at 390.19 keV.

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“…10 effect, measurement of the nuclear specific heat,· and perturbed 1 1 t . 11 angu ar corre a J.on ..…”

Section: Introductionmentioning

confidence: 99%