Search results

1

Conductivity Near the Metal-to-Insulator Transition in Cd_{1-x}Mn_{x}Se:Sc

100%

Głód P., Sawicki M., Lenard A., Dietl T., Plesiewicz W.

Acta Physica Polonica A

|

1991

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vol. 79

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issue 2-3

389-392

EN

Earlier studies of transition metal impurities in II-VI compounds suggest that Sc acts as a resonant donor. We performed Hall effect and conductivity measurements of CdSe:Sc and Cd_{0.95}Mn_{0.05}Se:Sc. The results, particularly the critical concentration of the metal-to-insulator transition, turned out to be similar to those obtained previously for Cd_{1-x}Mn_{x}Se doped with hydrogenic-like impurities, such as In and Ga. Therefore, if the ground state of Sc impurity is indeed located above the bottom of the conduction band, our data demonstrate that the metal-to-insulator transition is primarily driven by the scattering, i.e. it corresponds to the Anderson localization.

2

Influence of Bound Magnetic Polarons on Magnetic and Electrical Properties in Metallic n-Cd_{0.95}Mn_{0.05}Se

86%

Głód P., Sawicki M., Dietl T., Skośkiewicz T., Lenard A., Plesiewicz W.

Acta Physica Polonica A

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1995

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vol. 87

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issue 1

173-175

EN

Doping-induced contribution to the millikelvin magnetic susceptibility of Cd_{0.95}Mn_{0.05}Se:In has been found to undergo a maximum at n ≈ 2n_{c}, and to vanish for n ≥ 8n_{c}, where n_{c} is the electron concentration corresponding to the metal-insulator transition. This confirms the presence, also in the metallic phase, of bound magnetic polarons. Their slow dynamics may account for hysteresis visible in our magnetoresistance data.

3

Magnetic Susceptibility of Cd_{1-x}Fe_{x}Te_{1-y}Se_{y}

86%

Arciszewska M., Mycielski A., Dobrowolski W., Lenard A., Mauger A., Witkowska B.

Acta Physica Polonica A

|

1991

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vol. 80

|

issue 2

303-306

EN

Magnetic susceptibility of Cd_{1-x}Fe_{x}Te_{1-y}Se_{y} was found to consist of Van Vleck term (characteristic for the Fe^{2+} centers in tetrahedral crystal symmetry) and temperature-dependent contribution. The occurrence of the latter indicates an existence of additional magnetic moments. We ascribe their origin to the modification of the Fe^{2+} energy level spectrum induced by mixed Te-Se anion environment.

4

Mesoscopic Phenomena in Microstructures of IV-VI Epilayers

73%

Grabecki G., Dietl T., Plesiewicz W., Lenard A., Skośkiewicz T., Kamińska E., Piotrowska A., Papis E., Frank N., Bauer G.

Acta Physica Polonica A

|

1995

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vol. 87

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issue 2

551-554

EN

Magnetoresistance measurements of photolithographically patterned PbSe and Pb-{1-y}Mn_{x}Se microstructures were performed. Reproducible magnetoconductance fluctuations with the amplitude increasing with decreasing temperature were observed. Unexpectedly, these fluctuations contain a component periodic in the magnetic field, and their magnitude is greater than that expected from the current theory of the universal conductance fluctuations. Possible explanations are discussed.

5

Conductance Fluctuations in Microstructures of HgCdMnTe Bicrystals

73%

Grabecki G., Lenard A., Plesiewicz W., Jaroszyński J., Cieplak M., Skośkiewicz T., Dietl T., Kamińska E., Piotrowska A., Bulka B.

Acta Physica Polonica A

|

1991

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vol. 80

|

issue 2

307-310

EN

Microscopic four-contact probes to semimagnetic HgCdMnTe grain-boundary inversion layers have been photolithographically patterned. Magnetoresistance measurements performed on these samples revealed aperiodic conductance fluctuations of the magnitude of the order of e^{2}/h. Quantitative analysis of both fluctuation amplitude and their mean period indicate that we have approached the mesoscopic regime in our system. This opens new possibilities in studies of spin-subsystem dynamics in semimagnetic semiconductors.

6

Second Harmonic Generation in Spin-Glass Microstructures and Fabrication of Microstructures in IV-VI Epilayers

59%

Grabecki G., Dietl T., Cieplak M., Plesiewicz W., Lenard A., Skośkiewicz T., Kamińska E., Piotrowska A., Żarecka R., Springholz G., Bauer G.

Acta Physica Polonica A

|

1993

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vol. 84

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issue 4

781-784

EN

We studied magnetoconductance of two different mesoscopic systems: microregions containing two-dimensional electron gas adjacent to a grain-boundary plane in bicrystals of Hg_{0.79}Cd_{0.19}Mn_{0.02}Te and photolithographically patterned microstructures of Pb_{1-x}Mn_{x}Se. In both systems universal conductance fluctuations and generation of the second-harmonic voltage were observed at T ≤ 1 K. Moreover, in the former system the second harmonic signal exhibited distinct rise when the sample was cooled below the spin-glass freezing temperature (100 mK).

Refine search results

6 Acta Physica Polonica A

2 1995

1 1993

3 1991

6 Lenard A.

5 Dietl T.

5 Plesiewicz W.

4 Skośkiewicz T.

3 Grabecki G.

3 Kamińska E.

3 Piotrowska A.

2 Bauer G.

2 Cieplak M.

2 Głód P.

2 Sawicki M.

1 Arciszewska M.

1 Bulka B.

1 Dobrowolski W.

1 Frank N.

1 Jaroszyński J.

1 Mauger A.

1 Mycielski A.

1 Papis E.

1 Springholz G.

1 Witkowska B.

1 Żarecka R.

Conductivity Near the Metal-to-Insulator Transition in Cd_{1-x}Mn_{x}Se:Sc

Influence of Bound Magnetic Polarons on Magnetic and Electrical Properties in Metallic n-Cd_{0.95}Mn_{0.05}Se

Magnetic Susceptibility of Cd_{1-x}Fe_{x}Te_{1-y}Se_{y}

Mesoscopic Phenomena in Microstructures of IV-VI Epilayers

Conductance Fluctuations in Microstructures of HgCdMnTe Bicrystals

Second Harmonic Generation in Spin-Glass Microstructures and Fabrication of Microstructures in IV-VI Epilayers