Nuclear Quadrupole Resonance and the Electric Field Gradient in Metallic Indium

Hewitt, R. R.; Taylor, T.

doi:10.1103/physrev.125.524

Cited by 86 publications

(11 citation statements)

References 15 publications

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“…They have been used to predict electrical field gradients measured by nuclear probes in some solids [-15, 16]. Because of the inclusion of dipoles and even higher moments, the theoretical results were in significantly better agreement with the experiment in these cases [17][18][19][20][21]. The importance of the approach has mainly been recognized by molecular physics, see [22,23] and the references cited therein.…”

Section: Introductionmentioning

confidence: 99%

Crystal-field induced dipoles in heteropolar crystals I: Concept

Birkholz¹

1995

Z. Physik B - Condensed Matter

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Abstract. The electrostatic part of the internal energy of heteropolar crystals is largely assumed to be purely of the Coulomb or monopole type. Here, it is argued, ions in a crystal lattice may not only bear a net charge, but also higher electrostatic moments. This applies explicitly for dipole moments. Dipoles are assumed to occur only for ions on lattice sites where the point symmetry allows a non-vanishing crystal electric field to cause a polarization. Infinite lattice sums that account for the electrostatic interaction between point charges and dipoles are given, with the Madelung constant being the first of them in a more general Taylor expansion. An expression for the binding energy of heteropolar solids is hereby presented. The share due to induced dipoles is always negative if dipole-dipole interactions are neglected, i.e. it increases the strength of crystal binding. The concept, which is developed for crystals of arbitrary symmetry is explained on the basis of the examples (i) sphalerite (ZnS), (ii) pyrite (FeS2), (iii) rutile (TiO;), and (iv) orthorhombic LazCuO4.

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Section: Introductionmentioning

confidence: 99%

Crystal-field induced dipoles in heteropolar crystals I: Concept

Birkholz¹

1995

Z. Physik B - Condensed Matter

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“…This is close to the reported value Q ϳ 1.9 MHz in indium metal. 24 Such extrinsic 115 In signals are attributed to indium metal from residual In flux and/or small decompositions of the sample. Thus, the nine intrinsic peaks ͑spectrum I͒ seen clearly in the bottom line are ascribed to the In sites of the sample.…”

Section: Resultsmentioning

confidence: 99%

Localized5fantiferromagnetism in cubicUIn3:I
Sakai
¹
,
Kambe
²
,
Tokunaga
³

et al. 2009
Phys. Rev. B
9
0
19
0
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In nuclear magnetic resonance ͑NMR͒ and nuclear quadrupole resonance ͑NQR͒ measurements have been performed on an antiferromagnet UIn 3 with the cubic AuCu 3 -type structure. The NQR frequency ͑ Q ͒ and Knight shift ͑K͒ of 115 In in UIn 3 have been estimated in the paramagnetic state from NMR experiments under applied field. The perpendicular component of transferred hyperfine coupling constant ͑A Ќ ͒ has been deduced from scaled behavior of K to the static susceptibility ͑͒. Under zero field, the observation of the NQR spectrum has led to an estimated Q of 11.8 MHz at 90 K. The temperature variation in the NQR relaxation rates ͑1 / T 1 ͒ far above the Néel temperature T N = 88 K approaches a constant value, which indicates a localized nature for the 5f electrons in this system. On the other hand, in the antiferromagnetically ordered state at 4 K ͑well below T N ͒, the 115 In-NMR spectrum has been scanned over frequencies ranging from ϳ20 to ϳ70 MHz under zero applied field. From the analysis of the NMR spectrum, we propose that the most plausible direction of antiferromagnetic U moments may be ͗110͘ among the possible orientations of ͗100͘, ͗110͘, or ͗111͘.

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“…Theoretical calculation of the ionic contribution to eq gives a negative sign and only 20% of the absolute value. 8,9 Recently, Leiberich et al calculated not only the ionic contribution to eq, but also the conduction electron contribution. 19 The conduction electron wave functions were determined by the use of augmented plane wave ͑APW͒ method.…”

Section: Nuclear Quadrupole Interaction In Inmentioning

confidence: 99%

Specific heat below 1 mK and the electric-field gradient in indium

1996

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The specific heat of polycrystalline indium has been measured to well below 1 mK to determine the nuclear quadrupole interaction and to study the nuclear spin-spin interaction. The sign of the electric field gradient eq is found to be positive instead of the negative sign reported previously. This sign agrees with a recent calculation based on band theory. The local field coming from the nuclear spin-spin interaction is determined to be b int ϭ43Ϯ5 mT in indium.

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Nuclear Quadrupole Resonance and the Electric Field Gradient in Metallic Indium

Cited by 86 publications

References 15 publications

Crystal-field induced dipoles in heteropolar crystals I: Concept

Crystal-field induced dipoles in heteropolar crystals I: Concept

Localized5fantiferromagnetism in cubicUIn3:I
Sakai
¹
,
Kambe
²
,
Tokunaga
³

et al. 2009
Phys. Rev. B
9
0
19
0
View full text Add to dashboard Cite

Specific heat below 1 mK and the electric-field gradient in indium

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Nuclear Quadrupole Resonance and the Electric Field Gradient in Metallic Indium

Cited by 86 publications

References 15 publications

Crystal-field induced dipoles in heteropolar crystals I: Concept

Crystal-field induced dipoles in heteropolar crystals I: Concept

Localized5fantiferromagnetism in cubicUIn3:ISakai1, Kambe2, Tokunaga3 et al. 2009Phys. Rev. B90190View full textAdd to dashboardCite

Specific heat below 1 mK and the electric-field gradient in indium

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Product

Resources

About

Localized5fantiferromagnetism in cubicUIn3:I
Sakai
¹
,
Kambe
²
,
Tokunaga
³

et al. 2009
Phys. Rev. B
9
0
19
0
View full text Add to dashboard Cite