Density of states and magnetic properties of the rare-earth compounds RFe2, RCO2 and RNi2

Cyrot, M.; Lavagna, M.

doi:10.1051/jphys:01979004008076300

Cited by 185 publications

(52 citation statements)

References 25 publications

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“…To explain the dependence of T C with x for RNi 5Àx Cu x ferromagnets, we shall use a model of an effective d-f exchange interaction [26,27] describing the indirect f-f exchange between the R ions [12]. The effective d-f interaction is realized between R ions and 3d-band of Ni supplemented by external electrons of all atoms in alloy.…”

Section: Discussionmentioning

confidence: 99%

Magnetic properties of RNi5−xCux intermetallics

Кучин

Ermolenko

Kulikov

et al. 2006

Journal of Magnetism and Magnetic Materials

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Section: Discussionmentioning

confidence: 99%

Magnetic properties of RNi5−xCux intermetallics

Кучин

Ermolenko

Kulikov

et al. 2006

Journal of Magnetism and Magnetic Materials

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“…1,2 This can be explained in terms of Landau theory, yielding the conditions for the appearance of itinerant electron metamagnetism ͑IEM͒ as proposed by Wohlfarth and Rhodes: 3 large and negative values of the derivative of the density of states at the Fermi energy, a situation, e.g., accomplished for YCo 2 as shown by various band-structure calculations. [4][5][6] Furthermore, these compounds exhibit spinfluctuation properties such as enhanced values of the Pauli susceptibility 0 and the Sommerfeld value ␥. Measurements of the susceptibility up to 1000 K show broad maxima at temperatures of T max of about 300 K followed by a Curie-Weiss behavior at considerably higher temperatures, 7 a behavior consistent with Moriya's theory of spin fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Pressure-dependent electrical resistivity ofRCo2compounds(R= rare earth)

1998

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Studies of the electrical resistivity were carried out under applied hydrostatic pressures up to 20 kbar and in the temperature range from 1.5 K to room temperature. The pressure dependence of the magnetic-ordering temperatures and the suppression of spin fluctuations in the paramagnetic temperature regime have been deduced from the variation of characteristic features in (T, P). Grüneisen parameters of the magnetic-ordering temperature T C and the spin-fluctuation temperature T SF have been obtained and discussed with respect to a pressure-induced destabilization of the itinerant d subsystem. Finally, as the measurements are performed under hydrostatic conditions, a possible change in the character of the magnetic phase transition from first towards second order has been investigated. ͓S0163-1829͑98͒02405-9͔

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“…It is clear that because of the pseudo-gap at E F , LaAVRuO 6 are now stable against magnetic instabilities and therefore the systems stay in the nonmagnetic state. 26,27 In the nonmagnetic band structures of LaAVOsO 6 , LaAMoTcO 6…”

Section: B Effects Of Structural Optimizationmentioning

confidence: 99%

Robust half-metallic antiferromagnetsLaAVOsO6andLaA
Wang
¹
,
Guo
²

2006
Phys. Rev. B
82
6
63
0
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We have theoretically designed three families of the half-metallic (HM) antiferromagnets (AFM), namely, LaAVOsO 6 , LaAMoTcO 6 and LaAMoReO 6 (A = Ca, Sr, Ba), based on a systematic ab initio study of the ordered double perovskites LaABB ′ O 6 with the possible B and B ′ pairs from all the 3d, 4d and 5d transtion metal elements being considered. Electronic structure calculations based on first-principles density-functional theory with generalized gradient approximation (GGA) for more than sixty double perovskites LaCaBB ′ O 6 have been performed using the all-electron fullpotential linearized augmented-plane-wave method. The found HM-AFM state in these materials survives the full ab initio lattice constant and atomic position optimizations which were carried out using frozen-core full potential projector augmented wave method. It is found that the HM-AFM properties predicted previously in some of the double perovskites would disappear after the full structural optimizations. The AFM is attributed to both the superexchange mechanism and the generalized double exchange mechanism via the B (t 2g ) -O (2p π ) -B ′ (t 2g ) coupling and the latter is also believed to be the origin of the HM. Finally, in our search for the HM-AFMs, we find LaACrTcO 6 and LaACrReO 6 to be AFM insulators of an unconventional type in the sense that the two antiferromagnetic coupled ions consist of two different elements and that the two spin-resolved densities of states are no longer the same. It is hoped that our interesting predictions would stimulate further experimental searches for the HM-AFMs which have so far been unsuccessful.

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Density of states and magnetic properties of the rare-earth compounds RFe2, RCO2 and RNi2

Cited by 185 publications

References 25 publications

Magnetic properties of RNi5−xCux intermetallics

Magnetic properties of RNi5−xCux intermetallics

Pressure-dependent electrical resistivity ofRCo2compounds(R= rare earth)

Robust half-metallic antiferromagnetsLaAVOsO6andLaA
Wang
¹
,
Guo
²

2006
Phys. Rev. B
82
6
63
0
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Density of states and magnetic properties of the rare-earth compounds RFe2, RCO2 and RNi2

Cited by 185 publications

References 25 publications

Magnetic properties of RNi5−xCux intermetallics

Magnetic properties of RNi5−xCux intermetallics

Pressure-dependent electrical resistivity ofRCo2compounds(R= rare earth)

Robust half-metallic antiferromagnetsLaAVOsO6andLaAWang1, Guo2 2006Phys. Rev. B826630View full textAdd to dashboardCite

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Robust half-metallic antiferromagnetsLaAVOsO6andLaA
Wang
¹
,
Guo
²

2006
Phys. Rev. B
82
6
63
0
View full text Add to dashboard Cite