Étude Des Composés, Type Phase De Laves,
Entre Le Cobalt Et Les Terres Rares
Paramagnétisme Et Effets De La Pression

Bloch, Didier; Chaisse, F.; Givord, F.; Voiron, J.; Burzo, E.

doi:10.1051/jphyscol:19711228

Cited by 23 publications

(38 citation statements)

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“…The earlier magnetic measurements, on R-M exchange enhanced paramagnets, were performed in a limited temperature range, commonly up to 300-400 K. Maxima in the temperature dependences of the magnetic susceptibilities of RCo 2 (R = Y, Lu) compounds were shown [1,2]. The same behavior was evidenced in LaNi 5 [3].…”

Section: Introductionmentioning

confidence: 58%

“…In YCo 2-x M x compounds, for M = Ti, only little changes of T max temperatures are shown, while when Co is replaced by M = Ni, Si or Cr, the T max values decrease when increasing the content of substituting elements. Higher T max temperatures, as compared to that determined in YCo 2 , can be shown for LuCo 2 ( 2 ) where s is the Stoner enhancement factor and η, η' and η" are the state density at the Fermi level and their first and second derivatives, respectively.…”

Section: Experimental Results and Computed Datamentioning

confidence: 99%

“…Some previously reported data were also obtained up to 900 K [2]. The magnetic susceptibilities were determined from magnetization isotherms, according to Honda-Arrott plot [12]: χ m = χ +cM s H -1 , by extrapolating the measured values χ m to H -1 0.…”

Section: Experimental and Computing Methodsmentioning

confidence: 99%

“…Starting from the DOS at the Fermi level, at different volumes, the magnetic susceptibilities of LuCo 2 have been obtained - Fig.6b. In order to correlate their evolution with pressure, a compressibility value k = 9.4 · 10 -2 GPa -1 , determined on RCo 2 compounds [2], has been used. The magnetic susceptibility decreases with pressure up to p 4 GPa and then increases.…”

Section: T(k)mentioning

confidence: 99%

“…In this paper, based on the present and our previously published studies [2][3][4][5][6][7][8][9][10][11],on R-M or R-M-B exchange enhanced paramagnets, common features, for a wide range of crystal structures and Stoner enhancement factors, are evidenced. The experimentally determined susceptibilities are compared with those obtained from band structure calculations.…”

Section: Introductionmentioning

confidence: 99%

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Exchange enhanced paramagnetism of rare-earth (yttrium)-transition metal compounds

Burzo

2015

AIP Conference Proceedings

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Relevance of 4f-3d exchange to finite-temperature magnetism of rare-earth permanent magnets: An ab-initiobased spin model approach for NdFe 12 N Journal of Applied Physics 119, 213901 (2016) Abstract. The magnetic susceptibilities, χ, of R-M and R-M-B exchange enhanced paramagnets where R = Y, La, Lu and M= Co, Ni are analysed. As a general feature, there is a T 2 dependence of χ values at T < 10 K, while for T > T* a CurieWeiss behavior is shown. The experimental data are discussed in correlation with band structure calculations. The pressure dependence of LuCo 2 magnetic susceptibility is also analysed.

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Section: Introductionmentioning

confidence: 58%

Section: Experimental Results and Computed Datamentioning

confidence: 99%

Section: Experimental and Computing Methodsmentioning

confidence: 99%

Section: T(k)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exchange enhanced paramagnetism of rare-earth (yttrium)-transition metal compounds

Burzo

2015

AIP Conference Proceedings

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On the EPR Behaviour of the Cobalt Rare‐Earth Laves Phase

Burzo

Domsa

1972

Physica Status Solidi (b)

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In a previous work Barnes et al. (1) reported the results of EPR studies on the intermetallic compounds TCo having Laves phase structure (where T is a rare-earth element o r Sc, Zr, U, and Y). The determined g-values between 3 . 3 4 and 6 . 7 2 were explained by a resonance of non-S state cobalt ion. Gossard and Wernick (2) extended the measurements to UCo and ZrCo at higher frequencies. They concluded that the 2 2 observed resonance of these compounds is actually ferromagnetic. There are two surprising problems in the above mentioned works:a) It i s somewhat unexpected that the resonance be observed within such a large temperature range, since the ion with such great orbital g-shifts i s expected to relax quite rapidly.b) The studied compounds a r e in a paramagnetic state within the considered temperature range. 2To make clearthese problems we take again the measurements on RCo compounds 2 (R = Gd, Tb, D y , H o , and Er). The samples were prepared by the technique previously described (3). After thermal treatment, crystallographic purity was controlled by X-ray analysis.By paramagnetic measurements we intended to precise the electronic configuration of cobalt atoms in these compounds. A translation balance was used. The measurements were performed in external fields of 4 and 8 kOe respectively, both by heating and cooling the samples. The samples were closed in quartz ampoule5 under vacuum.In all cases the superposition of the results indicates the lack of any ferromagnetic impurities o r oxidation phenomena.7 physica (b)

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Figs. 111 - 129, Table 41

Kirchmayr¹,

Burzo²

Landolt-Börnstein - Group III Condensed Matter

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Étude Des Composés, Type Phase De Laves, Entre Le Cobalt Et Les Terres Rares Paramagnétisme Et Effets De La Pression

Cited by 23 publications

References 1 publication

Exchange enhanced paramagnetism of rare-earth (yttrium)-transition metal compounds

Exchange enhanced paramagnetism of rare-earth (yttrium)-transition metal compounds

On the EPR Behaviour of the Cobalt Rare‐Earth Laves Phase

Figs. 111 - 129, Table 41

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