Magnetic susceptibility of semimagnetic semiconductors: The high-temperature regime and the role of superexchange

Spałek, J.; Lewicki, Arkadiusz; Tarnawski, Z.; Furdyna, J. K.; Galazka, R. R.; Obuszko, Z.

doi:10.1103/physrevb.33.3407

Cited by 355 publications

(147 citation statements)

References 30 publications

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“…These values are very similar to the values of J/k B observed here. Our results indicate, that the superexchange interaction in chalcopyrite DMS depends strongly on the type of the chemical bond, as was suggested for other DMS experimentally 24,25 and theoretically. 26 The static magnetic properties of Cd 1-x Mn x GeAs 2 samples were studied with the use of the Weiss extraction method employed to the LakeShore 7229 susceptometer/magnetometer system.…”

Section: Magnetic Propertiessupporting

confidence: 60%

“…The values of J/k B are negative and relatively small, characteristic for the antiferromagnetic superexchange via an anion. 24,25 They are of the same order but somewhat smaller than those for zinc-blende II-VI DMS with Mn 24 . Larson et al suggested that in the superexchange interaction the anion is of more importance than the nonmagnetic cation.…”

Section: Magnetic Propertiesmentioning

confidence: 59%

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Homogeneous limit of Cd1−xMnxGeAs2 alloy: Electrical and magnetic properties

Kilański

Górska

Dynowska

et al. 2014

Journal of Applied Physics

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We present the studies of structural, electrical, and magnetic properties of bulk Cd 1-x Mn x GeAs 2 crystals with low Mn content, x, varying from 0 to 0.037. The studied samples have excellent crystallographic quality indicated by the presence of diffraction patterns never before observed experimentally for this compound. The electrical transport in our samples is dominated by thermal activation of conducting holes from the impurity states to the valence band with activation energy of about 200 meV. The defect states acting as ionic scattering centers with concentration in the range from 6 to 15×10 17 cm −3 are observed. The effective Mn content in our samples,x θ , determined from fit of the susceptibility data to the Curie-Weiss law, is very close to the average chemical content, x. It indicates that the Mn ions are distributed randomly, substituting the Cd sites in the host CdGeAs 2 lattice. We observe a negative Curie-Weiss temperature, |θ| ≤ 3.1 K, increasing as a function of x. This indicates the significance of the short-range interactions between the Mn ions.

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Section: Magnetic Propertiessupporting

confidence: 60%

Section: Magnetic Propertiesmentioning

confidence: 59%

Homogeneous limit of Cd1−xMnxGeAs2 alloy: Electrical and magnetic properties

Kilański

Górska

Dynowska

et al. 2014

Journal of Applied Physics

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“…With the usual assumptions 16 the value θ = −1.9 K gave J/k B = −0.25 K (assuming J = J 1 ). The results for the other two samples, with lower x, were J/k B = −0.30 (x = 2.6%) and −0.22 K (x = 1.9%), but these were judged to be less accurate.…”

Section: Resultsmentioning

confidence: 99%

Eu-Eu exchange interaction and Eu distribution inPb1−xEuxTefrom magnetizatio

et al. 1997

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The magnetization of Pb1−xEuxTe samples with x = 1.9, 2.6 and 6.0% was measured at 20 mK in fields up to 50 kOe, and at 0.6 K in fields up to 180 kOe. The 20 mK data show the magnetization steps (MSTs) arising from pairs and from triplets. The pair MSTs are used to obtain the dominant Eu-Eu antiferromagnetic exchange constant, J/kB = −0.264 ± 0.018 K. The exchange constant for triplets is the same. Comparison of the magnetization curves with theoretical simulations indicates that the Eu ions are not randomly distributed over all the cation sites. The deviation from a random distribution is much smaller if J is assumed to be the nearest-neighbor exchange constant J1 rather than the next-nearest-neighbor exchange constant J2. On this basis, J is tentatively identified as J1. However, the possibility that J = J2 cannot be excluded completely. To obtain agreement with the data, it must be assumed that the Eu ions tend to bunch together. Comparision with microprobe data indicates that the length scale for these concentration variations is smaller than a few µm. The theoretical simulations in the present work improve on those performed earlier by including clusters larger than three spins.75.50. Pp, 75.30.Et, 75.60.Ej

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“…8 As a consequence, many variables follow a linear dependence versus the content of the magnetic cations, as is the case of the Weiss temperature. 9 One of the problems encountered in DMSs is that most of these systems, particularly pseudobinary DMSs, exhibit comparatively higher values. 10 This makes the calculation of reliable Weiss temperatures more difficult due to experimental limitations on the available temperature range.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetic dilution in Zn1−xMnxGa2Se4 (0<x<0.5)

Morón

Hull

2005

Journal of Applied Physics

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The profound effect of magnetic dilution in Zn 1−x Mn x Ga 2 Se 4 with 0 Ͻ x Ͻ 0. 5 is demonstrated by the analysis of neutron powder diffraction and magnetic susceptibility data. All the members of the series show a defective stannite crystal structure and a random distribution of the Mn ions. The magnetic archetype system of Zn 1−x Mn x Ga 2 Se 4 with 0 Ͻ x Ͻ 0. 5 is not found to be MnGa 2 Se 4 ͑the magnetic end member of the series with I4 symmetry͒ but, instead, a hypothetical compound with I42m symmetry. The distance between the Mn ions along the various magnetic superexchange pathways is not seriously affected by the degree of dilution. However, the global magnetic interaction between manganese ions is found to be significantly higher than that expected for the classical magnetic dilution of the parent MnGa 2 Se 4 . A generally applicable method for the calculation of the correct Weiss temperature in diluted magnetic semiconductors is provided.

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Magnetic susceptibility of semimagnetic semiconductors: The high-temperature regime and the role of superexchange

Cited by 355 publications

References 30 publications

Homogeneous limit of Cd1−xMnxGeAs2 alloy: Electrical and magnetic properties

Homogeneous limit of Cd1−xMnxGeAs2 alloy: Electrical and magnetic properties

Eu-Eu exchange interaction and Eu distribution inPb1−xEuxTefrom magnetizatio

Effect of magnetic dilution in Zn1−xMnxGa2Se4 (0<x<0.5)

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Magnetic susceptibility of semimagnetic semiconductors: The high-temperature regime and the role of superexchange

Cited by 355 publications

References 30 publications

Homogeneous limit of Cd1−xMnxGeAs2 alloy: Electrical and magnetic properties

Homogeneous limit of Cd1−xMnxGeAs2 alloy: Electrical and magnetic properties

Eu-Eu exchange interaction and Eu distribution inPb1−xEuxTefrom magnetizatio

Effect of magnetic dilution in Zn1−xMnxGa2Se4 (0&lt;x&lt;0.5)

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Effect of magnetic dilution in Zn1−xMnxGa2Se4 (0<x<0.5)