Magnetic hyperfine interaction studies of isolated Ni impurities in Pd and Pd-Pt alloys

Müller, W.; Bertschat, H. H.; Haas, H.; Spellmeyer, B.; Zeitz, W.‐D.

doi:10.1103/physrevb.40.7633

Cited by 12 publications

(10 citation statements)

References 43 publications

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“…Its half-life was obtained as t 1/2 = 10(1) ns, in agreement with Ref. [5,14], but this value differs considerably from the value adopted in Ref. [15], t 1/2 = 3.33(21) ns.…”

Section: Magnetic Field Determinationsupporting

confidence: 70%

“…In addition, a TDPAD measurement on the I π = 9/2 + isomeric state of 63 Ni, whose g factor was known to be g = −0.269(3) [5] was performed. Its half-life was obtained as t 1/2 = 10(1) ns, in agreement with Ref.…”

Section: Magnetic Field Determinationmentioning

confidence: 99%

“…No matter what is the underlying mechanism for this effect, it is expected to be localized [4] and an interesting question is how the structure of the nuclei in this region develops when extra proton or neutron particles (or holes) are added. The g factor of the 9/2 + states in 63 Ni [5] and 67 Ni [6] are already measured and g( 63m Ni, I π = 9/2 + ) = -0.269(3) takes a value in agree-ment with the g factors of the other 9/2 + states in the region, while |g( 67m Ni, I π = 9/2 + )| = 0.125(6) differs significantly from the value expected for a pure neutron g 9/2 orbital. Thus, a measurement of the g( 65m Ni, I π = 9/2 + ) will provide information on the evolution of the structure of the 9/2 + νg 9/2 state towards N = 40 in the Nickel nuclei.…”

Section: Introductionmentioning

confidence: 99%

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g-factor of the 9/2+ isomeric state in 65Ni from transfer reaction

et al. 2006

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“…Its half-life was obtained as t 1/2 = 10(1) ns, in agreement with Ref. [5,14], but this value differs considerably from the value adopted in Ref. [15], t 1/2 = 3.33(21) ns.…”

Section: Magnetic Field Determinationsupporting

confidence: 70%

Section: Magnetic Field Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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g-factor of the 9/2+ isomeric state in 65Ni from transfer reaction

et al. 2006

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“…4 we present the measured g factors of 9=2 isomeric states around N 40, including also the g factor of 61m Fe. The data are taken from [2,12,17]. The comparison with the other g factors of known 9=2 isomeric states in the region strongly supports the 9=2 spin and parity assignment for the 61m Fe isomer.…”

mentioning

confidence: 62%

Magnetic Moment of the Fragmentation-AlignedF61e (9/2+)Isomer

et al. 2004

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We report on the g factor measurement of an isomer in the neutron-rich (61)(26)Fe (E(*)=861 keV and T(1/2)=239(5) ns). The isomer was produced and spin aligned via a projectile-fragmentation reaction at intermediate energy, the time dependent perturbed angular distribution method being used for the measurement of the g factor. For the first time, due to significant improvements of the experimental technique, an appreciable residual alignment of the nuclear spin ensemble has been observed, allowing a precise determination of its g factor, including the sign: g=-0.229(2). In this way we open the possibility to study moments of very neutron-rich short-lived isomers, not accessible via other production and spin-orientation methods.

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“…8 Spin-rotation spectra R(t) of the decaying isomers are measured as a function of temperature in magnetic fields of Bext^l.l, 1.5, and 1.8 T for the long- lived isomer and B QXt = 8.0 T for the short-lived one. Examples are shown in Fig.…”

Section: Observation Of a Fully Localized 3d 9 Configuration For Nickmentioning

confidence: 99%

Observation of a fully localized 3d9configuration for nickel ions in alkali metals

Kowallik¹,

Bertschat²,

Biedermann³

et al. 1989

Phys. Rev. Lett.

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The local susceptibilities and the 3d spin dynamics of isolated nickel ions in various alkali-metal hosts have been measured, utilizing the method of perturbed /-ray distribution after recoil implantation. In the heavy alkali-metal hosts Cs, Rb, and K, the local susceptibilities of the isolated Ni ions show the temperature behavior of a fully localized spin-orbit-coupled 3d 9 configuration. Clear host dependence of the magnetic behavior is seen in the spin-fluctuation rates which increase with decreasing host volume. In Na, the magnetic behavior drastically deviates from that of the purely ionic configuration, and Ni ions in Li as well as in Ca and Ba hosts are nonmagnetic.PACS numbers: 75.20.Hr, 75.30.Hx, 76.30.Fc, 76.80.+y In recent years the question of localization of electrons in the partially filled shells of transition metals has again become a subject of considerable interest. Following the table of transition elements by Smith and Kmetko, ! the degree of localization is the discriminating parameter for many bulk properties. The magnetism of most 4/ metals is known to be determined by localized electrons, whereas many d elements are strongly influenced by band structure and hybridization effects. Marking the change between localized and itinerant d and / electrons, the intermediate region, comprising, e.g., Ce and Fe, and Co and Ni, is rendered prominent by an extreme complexity of all-important bulk quantities.In the field of dilute magnetic alloys, the search for local moments is guided by the idea that magnetic moments will develop if the interaction of electrons "inside" one impurity atom survives hybridization or crystal fields. As nickel is estimated to have the strongest spinorbit coupling and exchange interaction in the 3d series, 2,3 a well-defined local magnetic moment might be expected in some metallic hosts, yet no such observation has been published.So the question arises whether nickel impurities will develop a fully localized configuration when incorporated in extreme environments. One such extreme system, which is characterized by sharp contrasts in atomic volume, electronegativity, and density of states between the constituents, has already been studied, Fe impurities in the alkali metals Cs, Rb, and K. 4 Here the isolated iron impurities are divalent and exhibit an unperturbed spin-orbit-coupled 3d 6 configuration. Another question of interest is the actual ionic configuration of the Ni ions in the host. Estimates on the basis of a Born-Haber cycle 5 suggest that Ni might be monovalent in the alkali metals and, even more interesting, might display charge fluctuations.In many metallic hosts Ni impurities show nonmagnetic behavior; in NiPd alloys, however, a positive magnetic hyperfine field has been found. 6 " 9 . This has been explained by negative core and positive orbital contributions and, in addition, transferred fields from neighbor-ing Pd atoms, but it is not an indication of an unperturbed well-defined moment. For Fe impurities, local orbital moments are thought to be typical f...

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Magnetic hyperfine interaction studies of isolated Ni impurities in Pd and Pd-Pt alloys

Cited by 12 publications

References 43 publications

g-factor of the 9/2+ isomeric state in 65Ni from transfer reaction

g-factor of the 9/2+ isomeric state in 65Ni from transfer reaction

Magnetic Moment of the Fragmentation-AlignedF61e (9/2+)Isomer

Observation of a fully localized 3d9configuration for nickel ions in alkali metals

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