Crystal Fields in PrX3 (X=In, Tl, Pb, Sn) Intermetallic Compounds with Cu3Au Structure

Groß, W.; Knorr, K.; Murani, A.P.; Buschow, K.H.J.

doi:10.1007/978-1-4615-8801-6_6

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…A relatively small energy separation between the 4f level and the Fermi level in CeIn3 would agree with the observation of a resistivity minimum in this compound (see figure 7). A situation similar to that described above for PrIn3 is reached in the isotypic compound PrT13 (Bucher et al 1968, Gross et al 1977. I n Pr3T1, too, a non-magnetic singlet state is lowest.…”

Section: )supporting

confidence: 66%

“…I n CeIns the doublet state is lowest (Buschow et al 1969a. The overall splitting deduced from the specific heat anomaly is 1% K. T h e overall splitting in P r h 3 is about 170 K. The lowest state is a nonmagnetic singlet (Gross et al 1977). I n the same way as discussed already in the case of Pr& and TmA13, exchange fields can induce a moment in this ground state by mixing it with higher magnetic states.…”

Section: )mentioning

confidence: 60%

“…Investigations of the relative importance of crystal field effects on the magnetic properties have been made on the compounds in which R represents Ce, Pr and Nd. Gross et al (1977), using inelastic neutron scattering, report that in PrSns a non-magnetic singlet level (PI) is the ground state, whereas in PrPb3 a non-magnetic triplet level is lowest. These results are in reasonable agreement with specific heat data (Bucher et al 1972(Bucher et al , 1974 and magnetic measurements (Lethuillier and Chaussy 1976b).…”

Section: Compounds With Group I Tv Elementsmentioning

confidence: 99%

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Intermetallic compounds of rare earths and non-magnetic metals

Buschow

1979

Rep. Prog. Phys.

358

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A review is given of the physical properties, composition and crystal structure of intermetallic compounds formed between rare-earth elements and non-magnetic metals, with emphasis on the magnetic properties, Included are the properties of compounds in which the non-rare-earth component is a 4d or 5d transition element. Special consideration is given to the properties of pseudo-binary compounds.Results of magnetisation measurements, neutron diffraction and neutron scattering are discussed together with results derived from NMR, ESR and MO. *s b auer effect spectroscopy. An evaluation is given of the relevance of the experimental results with respect to the different types of exchange interactions in this class of intermetallics.Special consideration is also given to the influence of crystal field effects on the magnetic properties and, furthermore, to the occurrence of intermediate valences in several of the compounds of Ce, Sm, Eu and Yb.

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Section: )supporting

confidence: 66%

Section: )mentioning

confidence: 60%

Section: Compounds With Group I Tv Elementsmentioning

confidence: 99%

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Intermetallic compounds of rare earths and non-magnetic metals

Buschow

1979

Rep. Prog. Phys.

358

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“…Fortunately, we have the example of PrIn 3 , a typical f 2 material with AuCu 3 -type crystal structure. From several experimental results, 1 has been confirmed to be the ground level in PrIn 3 [247,248]. Thus, the low-spin state should be taken for the AuCu 3 -type structure in the j -j coupling scheme.…”

Section: Level Scheme In the J -J Coupling Schemementioning

confidence: 95%

Orbital ordering phenomena in d- and f-electron systems

Hotta¹

2006

Rep. Prog. Phys.

115

117

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In recent decades, novel magnetism of d-and f-electron compounds has been discussed very intensively both in experimental and theoretical research fields of condensed matter physics. It has been recognized that these material groups are in the same category of strongly correlated electron systems, while the low-energy physics of d-and f-electron compounds has been separately investigated in rather different manners. One of the common features of both dand f-electron systems is certainly the existence of active orbital degree of freedom, but in f-electron materials, due to the strong spin-orbit interaction in rare-earth and actinide ions, the physics seems to be quite different from that of d-electron systems. In general, when the number of internal degrees of freedom and relevant interactions is increased, it is possible to obtain a rich phase diagram including large varieties of magnetic phases by using several kinds of theoretical techniques. However, we should not be simply satisfied with the reproduction of a rich phase diagram. It is believed that the more essential point is to seek a simple principle penetrating complicated phenomena in common with d-and f-electron materials, which opens the door to a new stage in orbital physics. In this sense, it is considered to be an important task of this paper to explain common features of magnetism in d-and f-electron systems from a microscopic viewpoint, using a key concept of orbital ordering, in addition to the review of the complex phase diagram of each material group. As a typical d-electron complex material exhibiting orbital order, we first focus on perovskite manganites, in which remarkable colossal magneto-resistance effect has been intensively studied. The manganites provide us with a good platform to understand that a simple mechanism works for the formation of complex spin, charge and orbital ordering. We also explain intriguing striped charge ordering on the orbitalordered background in nickelates and the effect of orbital ordering to resolve spin frustration in geometrically frustrated e g electron systems. Note that orbital ordering phenomena are also found in t 2g electron systems. Here we review recent advances in the understanding of orbital ordering phenomenon in Ca 2 RuO 4 . Next we discuss another spin-charge-orbital complex system such as the f-electron compound. After detailed explanation of the construction of microscopic models on the basis of a j -j coupling scheme, we introduce a d-electron-like

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The limits of the total crystal-field splittings

Mulak

2009

phys. stat. sol. (b)

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The crystal-fields causing |J electron states splittings of the same second moment σ 2 can produce different total splittings ∆E magnitudes. Based on the numerical data on crystal-field splittings for the representative sets of crystal-field Hamiltonians H CF = k q B kq C Mixing the H CF components with different q yields a secondary effect and does not determine the extreme splittings. The admissible ∆E min changes with J from 2.00σ to 2.40σ, whereas the ∆E max from 2.00σ to 4.10σ. The maximal gap ∆E max − ∆E min = 2.00σ has been found for the states |J = 4 . Not all the nominally allowed total splittings, preserving σ 2 = const condition, are physically available, and in consequence not all virtual splittings diagrams can be observed in real crystal-fields.

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Crystal Fields in PrX3 (X=In, Tl, Pb, Sn) Intermetallic Compounds with Cu3Au Structure

Cited by 13 publications

References 12 publications

Intermetallic compounds of rare earths and non-magnetic metals

Intermetallic compounds of rare earths and non-magnetic metals

Orbital ordering phenomena in d- and f-electron systems

The limits of the total crystal-field splittings

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