Electron-nuclear quadrupole interaction in exchange clusters

Fainzil'berg, V.E.; Belinskii, M.I.; Tsukerblat, Boris

doi:10.1080/00268978100103111

Cited by 13 publications

(16 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore the problem exists even for a distorted cluster. Thus electron-nuclear quadrupole coupling is possible for the trimeric clusters, as well as for the tetrameric systems investigated in [1]. This result is also based on a group-theoretical classification and therefore is true for all systems, in which non-Heisenberg interactions are small with respect to isotropic exchange interaction.…”

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 60%

“…Even without recourse to analysis of the HDVV model one can say that in the exchange system of the type mentioned above there are interactions removing nonphysical four-fold degeneracy. Thus unlike the corresponding discussions in [1] ( § 2) one can say that the conclusion about the degeneracy of the ground state does not hold true if the HDVV model is refined. This result is exact, because four-fold degeneracy is forbidden in trigonal groups.…”

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 61%

“…(2) j=l The following order of summation over l and j is assumed here and below 3 ata j = ala = + a2a a + aaa 1 ; the notations described in [1] are also assumed.…”

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 99%

“…Since N.Q.R. theory is considered as in [1], we shall refer to the results of a group-theoretical classification [8]. It was shown in [8] that the degeneracy over intermediate spin values in the HDVV model corresponds to the doublet orbital degeneracy of the state with S= 1/2.…”

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 99%

“…In the preceding paper [1] tetrahedral clusters with spin-coupled ground states have been examined. The special form of the electron-nflclear quadrupole interaction when there is orbital degeneracy of exchange multiplets has been considered.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Electron-nuclear quadrupole interaction in exchange clusters

1981

Self Cite

View full text Add to dashboard Cite

Electron-nuclear quadrupole interaction in trimeric antiferromagnetic dusters with half-integer ion spins is considered. The electronic shell of the exchange cluster is shown to produce electric field gradient at the nuclei. The antisymmetric exchange interaction of Dzialoshinskii leads to the flattening of the electric field gradient at the nuclei, located in geometrically non-equivalent positions due to distortions. The parameters of the quadrupole hamiltonian depend upon the external magnetic field. The magnetic field, parallel to the plane of the cluster, reduces the antisymmetric exchange interaction and re-establishes the geometric non-equivalence of the ions. The hyperfine fields on MSssbauer nuclei is examined. Noncollinear spin structure of the trimeric cluster is predicted. The theory explains qualitatively the peculiarities of MSssbauer spectra of iron threenuclear carboxylate crystals. INTRODUCTIONIn the preceding paper [1] tetrahedral clusters with spin-coupled ground states have been examined. The special form of the electron-nflclear quadrupole interaction when there is orbital degeneracy of exchange multiplets has been considered. When S= 0 the problem is not complicated by the influence of the electronic spin and hyperfine spin-spin electron-nuclear interaction. Hyperfine interaction is important for systems with S# 0. Therefore trimeric clusters of ions with half-integer spins possessing degenerate orbital multiplets and non-zero ground state spin will be considered below.

show abstract

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 60%

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 61%

“…(2) j=l The following order of summation over l and j is assumed here and below 3 ata j = ala = + a2a a + aaa 1 ; the notations described in [1] are also assumed.…”

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 99%

Section: Conditions Of Occurrence Of Electron--nuclear Quadrupole Coumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations