Investigation on the magnetically diluted spinels CdIn2-2xCr2xS4

Noguès, M.; Saifi, Anas; Hamedoun, M.; Dormann, J.L.; Malmanche, A.; Fiorani, D.; Viticoli, S.

doi:10.1063/1.330186

Cited by 15 publications

(5 citation statements)

References 6 publications

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“…The spinel structure easily forms substitutional solid solutions. Various divalent or trivalent admixture ions may be distributed between the tetrahedral or octahedral anion sites in the cubic structure, resulting in numerous modifications of the magnetic and electronic transport characteristics [29][30][31][32]. Continuing our investigations on ferroic properties of the chalcogenides, we have prepared single crystals of CdCr 2 Se 4 admixed with nonmagnetic Me 3+ x = In and Sb.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent lattice instability in single crystals of ferromagnetic CdCr₂Se₄diluted with In and Sb

Waśkowska¹,

Gerward²,

Olsen³

et al. 2008

J. Phys.: Condens. Matter

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In ferromagnetic CdCr2Se4 diluted with Mex3+ = In and Sb, deviations from cubic symmetry appear in the paramagnetic phase just below room temperature, and they increase with decreasing temperature. For Sb admixture, the unit-cell anomalies indicate a structural phase transition to occur at the same temperature as the magnetic transition, Tc = 130 K, which also is the same Tc as for the parent crystal CdCr2Se4. The low temperature phase has been described in orthorhombic space group Fddd. For In admixture, a structural transition occurs in the paramagnetic state at about Ta≈200 K (which is higher than Tc = 125 K), to a tetragonal structure with space group I41/amd. This behaviour is attributed to macroscopic spontaneous strain due to chemical heterogeneities, and to spin frustrations due to mixed valencies of Cr. The paramagnetic Curie–Weiss temperature θC−W decreases for both admixtures, indicating changes in competing ferromagnetic and antiferromagnetic interactions. The magnetization at 2.1 K exhibits saturation for H>0.6 T. The magnetic moments are μsat = 6.26 and 5.47 μB mol−1 for Sb and In admixtures, respectively. These values are consistent with the Cr3+ and Cr2+ mixed valencies, and with the proposed cation distribution model. A spin–phonon coupling of the transitions in the crystal with Sb admixture is suggested, while such a correspondence is not clear for the In admixture.

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Section: Introductionmentioning

confidence: 99%

Temperature dependent lattice instability in single crystals of ferromagnetic CdCr₂Se₄diluted with In and Sb

Waśkowska¹,

Gerward²,

Olsen³

et al. 2008

J. Phys.: Condens. Matter

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“…The synthesis and characterization of powder samples are described elsewhere [25]. For 2x = 2, 1.93, 1.90, and 1.80 the toroid shaped samples, required for susceptibility measurements, have been prepared by pressing the powder a t four tons and then by annealing the samples under a H,S stream a t 900 "C for 12 h. Powder from the same batch as for our earlier measurements has been used.…”

Section: Methodsmentioning

confidence: 99%

Frequency Dependence of the AC Susceptibility of the Reentrant System CdCr_2xIn_2−2xS₄ (0.85 < x ≦ 1)

Dormann¹,

Saifi²,

Cagan³

et al. 1985

Physica Status Solidi (b)

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on the occasion of his 80th birthday AC permeability measurements of the reentrant spin glass system CdC:r2,In2-,S4 (0.85 < x 1) are performed on toroidal shaped samples by using the transformer technique since the demagnetizing factor is minimized. The complex permeability observed is very close to the true initial permeability. The abrupt decrease of p' a t low temperatures is an intrinsic effect, probably related to the transition to the reentrant spin glass state. The out-of-phase permeability presents a maximum a t the transition temperature TRSG. The frequency dependence of 2'1~s~ is studied (130 Hz 5 5 v 5 100 kHz). Its variation corresponds with the explanation of reentrant properties based on the existence of clusters of which the freezing destroys the ferromagnetic order.En utilisant la mkthode du transformateur, des mesures de permkabilitk alternative ont Cte effectukes sur des bchantillons en forme de tore du systhme rbentrant verre de spin CdCr2,Inz -,S, (0,85 < x 1). Le facteur dkmagnktisant &ant minimisb, la permkabilitb complexe observbe est trhs proche de la permkabilitb initiale intrinshque. A basse tempbrature, la dkcroissance rapide de p' est un effet intrinshque, probablement relib A la transition vers un &tat spin glass rbentrant.La partie complexe de la permkabiliti: prksente un maximum B la tempkrature de transition TRSG.La variation de TRSG avec la frkquence a Otk btudibe (130 Hz 5 v 5 100 kHz); elle est en accord avec l'interprbtation des propribtbs rbentrantes basCe sur l'existence de clusters dont le gel dbtruit l'ordre ferromagnbtique.

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“…Using the experimental values of T c and q p [5] for each composition, the values of J 1 and J 2 have been evaluated and are presented in Table 1. In the same table we give also the values of the intra-plane and inter-plane interactions J aa Y J ab and J ac , respectively, 404 M. Hamedoun, M. Houssa, Y. Cherriet, and F. Z. Bakkali Ta b l e 1 Critical temperature T c , Curie-Weiss temperature q p , values of the first, second, intraplane and inter-plane exchange integrals of CdCr 2x In 2À2x S 4 as a function of dilution x which have been calculated adopting the probability distribution described in [1,2],…”

Section: Calculation Of the Values Of The Exchange Integralsmentioning

confidence: 99%

“…In a previous work [5,6], interest has been given to the critical behaviour of the system CdCr 2x In 2À2x S 4 in the range of concentration 0 x 1. The main feature of these investigations can be briefly summarized as follows.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Properties and Critical Behaviour of the B-Spinel CdCr2xIn2?2xS4 (0.9 ? x ? 1)

Hamedoun

Houssa

Cherriet

et al. 1999

phys. stat. sol. (b)

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Investigation on the magnetically diluted spinels CdIn2-2xCr2xS4

Cited by 15 publications

References 6 publications

Temperature dependent lattice instability in single crystals of ferromagnetic CdCr₂Se₄diluted with In and Sb

Temperature dependent lattice instability in single crystals of ferromagnetic CdCr₂Se₄diluted with In and Sb

Frequency Dependence of the AC Susceptibility of the Reentrant System CdCr_2xIn_2−2xS₄ (0.85 < x ≦ 1)

Magnetic Properties and Critical Behaviour of the B-Spinel CdCr2xIn2?2xS4 (0.9 ? x ? 1)

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Investigation on the magnetically diluted spinels CdIn2-2xCr2xS4

Cited by 15 publications

References 6 publications

Temperature dependent lattice instability in single crystals of ferromagnetic CdCr2Se4diluted with In and Sb

Temperature dependent lattice instability in single crystals of ferromagnetic CdCr2Se4diluted with In and Sb

Frequency Dependence of the AC Susceptibility of the Reentrant System CdCr2xIn2−2xS4 (0.85 < x ≦ 1)

Magnetic Properties and Critical Behaviour of the B-Spinel CdCr2xIn2?2xS4 (0.9 ? x ? 1)

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Product

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Temperature dependent lattice instability in single crystals of ferromagnetic CdCr₂Se₄diluted with In and Sb

Temperature dependent lattice instability in single crystals of ferromagnetic CdCr₂Se₄diluted with In and Sb

Frequency Dependence of the AC Susceptibility of the Reentrant System CdCr_2xIn_2−2xS₄ (0.85 < x ≦ 1)