Chapter 3 Formation of 3d-moments and spin fluctuations in some rare-earth-cobalt compounds

Duc, Nguyen Huu; Brommer, P.E.

doi:10.1016/s1567-2719(99)12007-9

Cited by 42 publications

(53 citation statements)

References 185 publications

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“…The compound YCo 2 with the cubic Laves phase C15 structure is known as strongly enhanced Pauli paramagnet, which exhibits a distinct maximum in the temperature dependence of the magnetic susceptibility at T ; 230 K, and the itinerant metamagnetic transition to the FM phase in fields of about 70 T [36,44,45]. Also, a strong pressure effect on χ has been observed in YCo 2 and some Y(Co 1 2 −x x M ) alloys [40,45,46].…”

Section: Tico Ni 3 Al and Yco 2 Systemsmentioning

confidence: 99%

“…Also, a strong pressure effect on χ has been observed in YCo 2 and some Y(Co 1 2 −x x M ) alloys [40,45,46]. In order to find the origin of pronounced volume and temperature effects on magnetic susceptibility in YCo 2 compound, the volume dependent electronic structure was calculated ab initio by employing the FP-LMTO method, within LSDA.…”

Section: Tico Ni 3 Al and Yco 2 Systemsmentioning

confidence: 99%

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Magnetic-field-induced effects in the electronic structure of itinerant d- and f-metal systems

Grechnev

2009

Low Temperature Physics

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A paramagnetic response of transition metals and itinerant d-and f -metal compounds in an external magnetic field is studied by employing ab initio full-potential LMTO method in the framework of the local spin density approximation. Within this method the anisotropy of magnetic susceptibility in hexagonal close-packed transition metals is evaluated for the first time. This anisotropy is owing to the orbital Van Vleck-like paramagnetic susceptibility, which is revealed to be substantial in transition metal systems due to hybridization effects in electronic structure. It is demonstrated, that compounds TiCo, Ni 3 Al, YCo 2 , CeCo 2 , YNi 5 , LaNi 5 and CeNi 5 are strong paramagnets close to the quantum critical point. For these systems the Stoner approximation underestimates the spin susceptibility, whereas the calculated field-induced spin moments provided a good description of the large paramagnetic susceptibilities and magnetovolume effects. It is revealed, that itinerant description of hybridized f electrons produces magnetic properties of CeCo 2 , CeNi 5 , UAl 3 , UGa 3 , USi 3 and UGe 3 compounds in close agreement with experiment. In the uranium UX 3 compounds the strong spin-orbit coupling together with hybridization effects give rise to peculiar magnetic states, where the field-induced spin moments are antiparallel to the external field and the magnetic response is dominated by the orbital contribution.

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Section: Tico Ni 3 Al and Yco 2 Systemsmentioning

confidence: 99%

Section: Tico Ni 3 Al and Yco 2 Systemsmentioning

confidence: 99%

Magnetic-field-induced effects in the electronic structure of itinerant d- and f-metal systems

Grechnev

2009

Low Temperature Physics

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“…[1][2][3][4] In particular, the study of the Co band has been the subject of intense investigation for decades. [5][6][7][8][9][10][11][12][13] In these compounds, the Co sublattice is near the critical condition for the formation of magnetic moment, turning the Co 3d-electron system very sensitive to the internal field created by the R sublattice or to changes of external parameters. Particularly unique is the case of the Co sublattice in ErCo 2 , as it is just above the condition for undergoing a metamagnetic transition.…”

Section: Introductionmentioning

confidence: 99%

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

et al. 2011

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Zero-field muon spin relaxation spectroscopy (μSR) measurements in the paramagnetic phase of ErCo 2 ferrimagnetic system are reported. Previous experimental studies using macro-and microscopic techniques led to the identification of magnetic short-range correlations between the Co atoms in the paramagnetic state of this material. The analysis of μSR spectra recorded on ErCo 2 well above T c indicates two dynamical magnetic processes characterized by remarkably different relaxation rates: a slow-relaxing signal, which quantitatively coincides with previous μSR studies on ErAl 2 , and fast-relaxing signal, which can be ascribed to the Co short-range correlated regions observed above T c . Moreover, the μSR technique provides information on the thermal dependence of Co correlated regions at true zero field. These findings shed light on the dynamical nature of the clustered phase developing in the paramagnetic state of ErCo 2 .

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“…They usually have gigantic values of the magnetocaloric effect, magnetostriction and magnetoresistance [2][3]. Among these materials there are RCo2 compounds, in which there is a sharp dependence the magnetic phase transitions from the lattice parameters [5][6][7][8][9]. Transformation of the crystal and magnetic structure as a result of magnetic phase transitions in NdCo 2 on polycrystalline samples was studied in [1], with methods of X-ray and neutron diffraction.…”

Section: Introductionmentioning

confidence: 99%

Magnetostriction and transformation of crystal structure of intermetallic compound NdCo₂

Никитин

Karpenkov

Терешина

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. Ferromagnetic compound NdCo 2 has complex magnetic transformation, which are accompanied by changes of the crystal lattice. The purpose of this paper was the investigation of influence of these transformations on the field and temperature dependence of magnetostriction. It was found that near the Curie temperature Tc = 98K, where the transition from cubic to tetragonal phase is observed, there is a maximum in the temperature dependence of the transverse magnetostriction λ ┴ (T) in the field B=4T. In this field λ ┴ reaches high values of λ ┴~2 00·10 -6 at temperatures higher than T c . This shows that in this field, the tetragonal distortion and band magnetism of 3d-subsystem remain even at T>Tc. At T<42K λ ┴ decreases in field B=0.5 T due to phase transition from tetragonal phase to orthorhombic. The curve λ ┴ (H) at T = 10 K anomalies are observed. They are associated with the fact that under the action of the external field there are consistent transitions from orthorhombic phase to tetragonal and then to cubic. Thus, it was found that the compound NdCo 2 crystal structure is reconstructed with magnetic field.

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Chapter 3 Formation of 3d-moments and spin fluctuations in some rare-earth-cobalt compounds

Cited by 42 publications

References 185 publications

Magnetic-field-induced effects in the electronic structure of itinerant d- and f-metal systems

Magnetic-field-induced effects in the electronic structure of itinerant d- and f-metal systems

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

Magnetostriction and transformation of crystal structure of intermetallic compound NdCo₂

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Chapter 3 Formation of 3d-moments and spin fluctuations in some rare-earth-cobalt compounds

Cited by 42 publications

References 185 publications

Magnetic-field-induced effects in the electronic structure of itinerant d- and f-metal systems

Magnetic-field-induced effects in the electronic structure of itinerant d- and f-metal systems

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

Magnetostriction and transformation of crystal structure of intermetallic compound NdCo2

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Resources

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Magnetostriction and transformation of crystal structure of intermetallic compound NdCo₂