Distribution of Jahn-Teller distortions of Cr2+ in ZnTe from magnetization steps

McCabe, G. H.; Shapira, Y.; Bindilatti, V.; Oliveira, N. F.; Twardowski, A.; Mac, W.; Demianiuk, M.

doi:10.1016/0038-1098(95)00394-0

Cited by 14 publications

(4 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…30,[35][36][37] There are no MSTs for this field orientation. Thus, if H is parallel to the ͓001͔ direction, Cr 2ϩ ions whose JT distortion is along ͓001͔ will give rise to MSTs, but those with distortions along ͓100͔ or ͓010͔ will not.…”

Section: B Distribution Of Jahn-teller Distortions For Cr 2¿ In Zntementioning

confidence: 99%

“…Figure 6 shows the experimental magnetization curve at 0.6 K, for a Cr concentration xϷ0.1%. 30 This curve has been corrected for a ''background,'' mainly from the lattice diamagnetism. The second MST, at H 2 ϭ73.7Ϯ2 kOe, is visible, but its size is only about 1/7 of the size in the NEQ model.…”

Section: B Distribution Of Jahn-teller Distortions For Cr 2¿ In Zntementioning

confidence: 99%

See 1 more Smart Citation

Magnetization-step studies of antiferromagnetic clusters and single ions: Exchange, anisotropy, and statistics

Shapira

Bindilatti

2002

Journal of Applied Physics

Self Cite

114

141

View full text Add to dashboard Cite

Theoretical and numerical model for estimating unknown magnetic parameters in studying ferromagnetic and antiferromagnetic coupled films Influence of exchange energy and magnetic anisotropy on the nanocrystalline alloy A magnetic cluster is a group of magnetic ions ͑''spins''͒ that interact with each other but which, to a good approximation, do not interact with other magnetic ions. Such clusters are responsible for many of the interesting and useful properties of a large number of molecular crystals, and of dilute magnetic materials below the percolation concentration. In a molecular crystal the magnetic clusters are usually all of one type. In a dilute magnetic material, on the other hand, many cluster types are present. The magnetization-step ͑MST͒ method is a relatively new form of spectroscopy for measuring intracluster magnetic interactions, mainly exchange constants and anisotropy parameters. In dilute magnetic materials this method also yields the relative populations of different cluster types. This review focuses on the principles and applications of the MST method to relatively small clusters, no more than a dozen spins or so. It covers only MSTs from spin clusters in which the dominant exchange interaction is antiferromagnetic ͑AF͒, and MSTs from isolated magnetic ions. Such MSTs are the result of changes of the magnetic ground state, caused by energy-level crossings in a magnetic field H. At a sufficiently low temperature, each change of the ground state leads to a MST. Magnetic clusters may be classified by size. The smallest is a ''single,'' consisting of one isolated magnetic ion. Next are ''pairs'' ͑dimers͒, followed by ''triplets'' ͑trimers͒, ''quartets'' ͑tetramers͒, etc. Although the classification by size is useful, clusters of the same size may have different intracluster interactions, and also different geometrical shapes. More detailed classifications of magnetic clusters are therefore also needed. A cluster ''type'' specifies both the size of the cluster and the set of all intracluster magnetic interactions which are nonzero. Different geometries of clusters of the same type correspond to different ''configurations.'' MSTs from isolated spins ͑singles͒ are discussed first. When subjected to certain types of single-ion anisotropy, e.g., uniaxial hard-axis anisotropy, singles give rise to MSTs. Examples of anisotropy parameters which were determined from such MSTs are presented. An interesting application of MSTs from singles is the determination of the populations of Jahn-Teller distortions which are energetically equivalent at Hϭ0 but are inequivalent at finite H. For clusters larger than singles, the strongest intracluster interaction is usually the isotropic exchange. Using a model with one isotropic exchange constant J, predictions for MSTs from pairs, open and closed triplets, and the six possible types of quartets, are presented. Observations of some of these MSTs, and the exchange constants derived from them, are discussed. Recent studies of MSTs from AF rings in molecular crystals ...

show abstract

Section: B Distribution Of Jahn-teller Distortions For Cr 2¿ In Zntementioning

confidence: 99%

Section: B Distribution Of Jahn-teller Distortions For Cr 2¿ In Zntementioning

confidence: 99%

Magnetization-step studies of antiferromagnetic clusters and single ions: Exchange, anisotropy, and statistics

Shapira

Bindilatti

2002

Journal of Applied Physics

Self Cite

114

141

View full text Add to dashboard Cite

show abstract

“…To obtain eigenstates and energies we generally follow the crystal field model developed by Vallin 24,25 and successfuly used for cubic Cr-DMS. 26,[29][30][31][32] We recall that the model takes into account tetrahedral crystal field, spin-orbit interaction, static tetragonal Jahn-Teller distortion and magnetic field. In the present case additionally the hexagonal crystal field has to be included.…”

Section: Magnetizationmentioning

confidence: 99%

Magnetization and exciton spectroscopy of the diluted magnetic semiconductorCd1−xCrxS
Herbich
¹
,
Mac
²
,
Twardowski
³

et al. 1998
Phys. Rev. B
Self Cite
40
2
17
1
View full text Add to dashboard Cite

Free-exciton magnetoreflectance and magnetization are used to study the p-d exchange interaction of Cd 1Ϫx Cr x S ͑xϭ0.0024, 0.0031, and 0.0033͒. Magnetization data are well described by a simple crystal-field model taking into account static, tetragonal Jahn-Teller distortion suffered by Cr 2ϩ ions, as well as the hexagonal crystal field of CdS. In effect, a strong magnetic anisotropy of a single Cr 2ϩ ion was found. From the heavy-hole exciton splitting, and the Cr 2ϩ ion spin deduced from magnetization data, the p-d exchange parameter was evaluated as N 0 ␤ϭϩ0.48Ϯ0.05 eV, using the previously obtained s-d exchange parameter: N 0 ␣ϭϩ0.22Ϯ0.01 eV. These exchange parameters provide a reasonable description of the exciton splittings for a magnetic field oriented along or perpendicularly to the crystal hexagonal axis.

show abstract

“…Single crystal growth of Zn 1Àx Cr x Te was attempted by earlier workers by different techniques [15,[17][18][19]. However, these authors have grown crystals of one or two compositions only and not over a wide range of compositions.…”

Section: Introductionmentioning

confidence: 98%

Growth and structural properties of Zn1−xCrxTe crystals

Krishnaiah

Rao

Reddy

et al. 2008

Journal of Crystal Growth

View full text Add to dashboard Cite

Distribution of Jahn-Teller distortions of Cr2+ in ZnTe from magnetization steps

Cited by 14 publications

References 9 publications

Magnetization-step studies of antiferromagnetic clusters and single ions: Exchange, anisotropy, and statistics

Magnetization-step studies of antiferromagnetic clusters and single ions: Exchange, anisotropy, and statistics

Magnetization and exciton spectroscopy of the diluted magnetic semiconductorCd1−xCrxS
Herbich
¹
,
Mac
²
,
Twardowski
³

et al. 1998
Phys. Rev. B
Self Cite
40
2
17
1
View full text Add to dashboard Cite

Growth and structural properties of Zn1−xCrxTe crystals

Contact Info

Product

Resources

About

Distribution of Jahn-Teller distortions of Cr2+ in ZnTe from magnetization steps

Cited by 14 publications

References 9 publications

Magnetization-step studies of antiferromagnetic clusters and single ions: Exchange, anisotropy, and statistics

Magnetization-step studies of antiferromagnetic clusters and single ions: Exchange, anisotropy, and statistics

Magnetization and exciton spectroscopy of the diluted magnetic semiconductorCd1−xCrxSHerbich1, Mac2, Twardowski3 et al. 1998Phys. Rev. BSelf Cite402171View full textAdd to dashboardCite

Growth and structural properties of Zn1−xCrxTe crystals

Contact Info

Product

Resources

About

Magnetization and exciton spectroscopy of the diluted magnetic semiconductorCd1−xCrxS
Herbich
¹
,
Mac
²
,
Twardowski
³

et al. 1998
Phys. Rev. B
Self Cite
40
2
17
1
View full text Add to dashboard Cite