Hyperfine fields in erbium metal

Hüfner, S.; Kienle, Paul; Wiedemann, W.; Eicher, H.

doi:10.1007/bf01380881

Cited by 19 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2,8 If the target undergoes a transition from an initial state i with wave function <p { to a final state / with wave function cp fj and if the incident particle imparts a momentum ftq to the target, the amplitude F fi (q) takes the form …”

mentioning

confidence: 99%

See 1 more Smart Citation

Experimental Determination of the Inner Sternheimer Shielding FactorR5fof an Actnide

1971

View full text Add to dashboard Cite

The comparison between experimental values of the electric field gradient in neptunyl and uranyl complexes allows the derivation of a simple expression for the inner Sternheimer factor in Np. Its evaluation using relativistic expressions for the hyperfine interactions gives the result JR 5/ =0.35±0.1. An early theoretical estimate is in poor agreement with this number.The Hamiltonian describing the nuclear quadrupole interaction in the presence of an axially symmetric electric field gradient (efg) has the form 3C Q =[e 2^( ?(3?/-/ 2 )]/4/(2/-l).(1)Here Q is the nuclear quadrupole moment, eq z is the principal component of the efg tensor evaluated at the nucleus, and I* and I 2 are the nuclear angular momentum operators. If Q is known, 1 a measurement of the quadrupole interaction makes it possible to obtain the value of eq z . In general eq z is the sum of several contributions having values that depend on the physical and chemical nature of the solid. In the case of a covalent complex of an actinide we can write + B(i~i?" J k / A !ffl i %J.(2) tnlm The first term of Eq.(2) is given in analogy to rare-earth compounds, 2 and e(q 5f ) T represents the thermal expectation value of the efg produced by the 5f valence electrons which do not participate in bonding. As originally pointed out by Sternheimer, the inner electrons modify the efg, 3 and this effect is described by the introduction of a shielding factor (l-i? 5/ ). In the second term, eq Utt is the efg from the lattice charges external to the ion. The corresponding Sternheimer factor y^ is large and negative for the actinides (ca. -150), 4 however the lattice term is in general small compared to the other contributions. The last term in Eq.(2) gives the efg from bonding orbitals of the type nlm and the R nl are again Sternheimer factors. Since the 5/ electrons often participate in the bonding of actinide compounds, this term can be of major importance. This is a behavior quite different from the rare earths.For the purpose of this paper we will combine the last two terms of Eq. (2) and write eq z =e(q 5f ) T (l-R 5f ) + eq'.In order to extract the value of R 5f from a measurement of eq z , one needs to know e(q Bf ) T and eq'. The first term e(q 5f ) T can be calculated in 1085

show abstract

mentioning

confidence: 99%

“…(2) is given in analogy to rare-earth compounds, 2 and e(q 5f ) T represents the thermal expectation value of the efg produced by the 5f valence electrons which do not participate in bonding. As originally pointed out by Sternheimer, the inner electrons modify the efg, 3 and this effect is described by the introduction of a shielding factor (l-i?…”

mentioning

confidence: 99%

Experimental Determination of the Inner Sternheimer Shielding FactorR5fof an Actnide

1971

View full text Add to dashboard Cite

show abstract

“…4 The accurate measurement of the excited-state magnetic moment of 166 Er using ME and electron-paramagnetic-resonance data 5 made it possible to determine the magnitude of the effective field, and Hiifner et at., studied this as a function of temperature between 4.2 and 40°K. 6 The temperature dependence of the electric quadrupole interaction was also measured in this temperature region.…”

mentioning

confidence: 99%

Mössbauer-Effect Study of the Magnetic Structure of Single-Crystal Erbium

Reese

Barnes

1967

Phys. Rev.

View full text Add to dashboard Cite

“…Mossbauer effect studies have been made on polycrystalline absorbers of terbium, dysprosium, erbium and thulium (10)(11)(12)(13). These measurements have determined the magnitude of the hyperfine field but they provide little information about the directional properties of these fields.…”

Section: Mossbauer Effect Studies In the Rare Earthsmentioning

confidence: 99%

“…The temperature dependence of both the magnetic interaction and the quadrupole interaction has been measured for polycrystalline erbium samples by Hufner, et al (12). Measurements were made between 4.2 and 40°K and the magnetic field extrapolated to 0°K was found to be …”

Section: Previous Mossbauer Effect Studies With Er^^gmentioning

confidence: 99%

A Mössbauer effect study of the magnetic structure of single crystal erbium

Reese

View full text Add to dashboard Cite

Hyperfine fields in erbium metal

Abstract: The hyperfine splitting of the 80.6-keV y transition in Er 166 has been measured in erbium metal between 4.2 ~ and 40 ~ using the M6ssbauer effect. There is evidence for a unique magnetic field and electric fieldgradient at all nuclei in erbium metal. The magnetic field decreases from

Cited by 19 publications

References 0 publications

Experimental Determination of the Inner Sternheimer Shielding FactorR5fof an Actnide

Experimental Determination of the Inner Sternheimer Shielding FactorR5fof an Actnide

Mössbauer-Effect Study of the Magnetic Structure of Single-Crystal Erbium

A Mössbauer effect study of the magnetic structure of single crystal erbium

Contact Info

Product

Resources

About