Role of the rare-earth atoms affecting the spin fluctuation scattering in the (RE, Y)Co2 compounds

Duc, Nguyen Huu; Hien, Than Duc; Phuong, Phan Thi Thu; Brommer, P.E.

doi:10.1016/0921-4526(91)90459-r

Cited by 20 publications

(5 citation statements)

References 10 publications

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“…34,52 At T C the spinfluctuation scattering becomes suppressed when a moment is induced on the Co sites due to the presence of an effective field. The latter is caused by the appearance of a molecular field due to the spontaneous alignment of the R ions.…”

Section: ͑5͒mentioning

confidence: 98%

“…This in turn leads to the negative values of ⌬(T) below T C occasionally observed. 34,52 In order to trace the effect of pressure on the temperaturedependent resistivity we have applied this procedure to our measured data, where (T) of LuCo 2 at ambient pressure only has been taken as a reference. Figure 9 depicts ⌬(T, P) of ErCo 2 and HoCo 2 .…”

Section: ͑5͒mentioning

confidence: 99%

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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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Section: ͑5͒mentioning

confidence: 98%

Section: ͑5͒mentioning

confidence: 99%

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

1998

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“…To explain the resistance results we propose the following scenario. Above T C , in RCo 2 , the resistivity is governed by spin-disorder scattering of conduction electrons on the paramagnetic rare-earth moments and on spin fluctuations arising mainly from local splitting of the cobalt 3d band (Duc et al 1991, Gratz et al 1995. When the temperature is lowered, the 4f moments which order ferromagnetically at T C yield a strong molecular field in the material.…”

Section: Resistivity and Magnetoresistancementioning

confidence: 99%

Magnetic and electrical properties of the compounds

Duc

Oanh

1997

J. Phys.: Condens. Matter

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The magnetization, a.c. susceptibility, resistivity and magnetoresistance have been measured for the invariable-unit-cell-parameter compounds. The Si substitution for Co in yields a dramatic initial increase of , whereas the 3d magnetic moment is reduced. These findings may be attributed to the strong involvement of Si p states in the hierarchy of exchange interactions. The magnetic phase transition at is of first order for the compounds with x < 0.075. For these compounds, the coexistence of metamagnetism and the quenching of spin fluctuations at are provided.

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“…Significant modifications in the temperature dependence of the electrical resistivity, susceptibility and thermopower were observed in RCo 2 [1][2][3][4][5], pseudobinary (R 1Àx Y x )Co 2 [1,2,[6][7][8][9][10][11][12] and LR 1Àx HR x Co 2 (LR ¼ light rare earth and HR ¼ heavy rare earth) [13][14][15] compounds depending on the type of rare earth element and concentration of substituting second rare earth or non-magnetic Y. Up to now detailed study of the behaviour of both rare earth and Co magnetic subsystems with Y-substitution is performed for the R 1Àx Y x Co 2 compounds with R ¼ Dy, Er, Ho, Tb, Gd.…”

Section: Introductionmentioning

confidence: 99%