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1
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Magnetization Relaxation in CdMnS

100%
Witowski A., Kutter C., Mac W., Wyder P.
Acta Physica Polonica A
|
1993
|
vol. 84
|
issue 4
798-800
EN
The static magnetization measurements and relaxation of magnetization data for two Cd_{1-x}Mn_{x}S samples with different composition are presented. The magnetization is described by the modified Brillouin function. The magnetization relaxation shows unusual composition dependence. This behavior is explained by cross-relaxation to the unknown fast relaxing centers introduced during growth.
2
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The Relaxation of Mn Pairs in CdMnTe at High Magnetic Fields

100%
Strutz T., Witowski A., Wyder P.
Acta Physica Polonica A
|
1991
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vol. 80
|
issue 3
313-316
EN
The spin-lattice relaxation in CdMnTe at 4.7 K has been measured at high magnetic fields up to 24.5 T. At fields, where the ground state of nearest-neighbor exchange coupled Mn pairs changes due to energy level crossing, an increase in the relaxation rate is observed. This is attributed to the change of relaxation of nearest-neighbor Mn pairs. It proves that not only large size Mn clusters are involved in the relaxation as it has been shown previously, but also Mn pairs. It shows as well that the mixing of pair states is quite effective.
3
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Orientation Dependent Spin-Lattice Relaxation in CdMnSe

100%
Witowski A., Strutz T., Wyder P.
Acta Physica Polonica A
|
1995
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vol. 87
|
issue 2
536-538
EN
The magnetization dynamics of Cd_{1-x}Mn_{x}Se at 4.5 K as a function of magnetic field up to 22 T was measured using a nonresonant technique. For x = 0.01 the relaxation does not depend on orientation and in higher fields the relaxation rates are proportional to B^{3}. For x = 0.02 a dependence on orientation is observed. The difference does not depend on magnetic field. This suggests that either the interaction between Mn ions responsible for spin-lattice relaxation in Mn clusters is anisotropic, or the relaxing clusters are oriented in a given manner with respect to the c axis.
4
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Long-wavelength Optical Phonons in Cd_{1-x}Mn_{x}Se and Cd_{1-x}Fe_{x}Se Mixed Crystals

100%
Witowski A., Hausenblas M., Wyder P.
Acta Physica Polonica A
|
1991
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vol. 79
|
issue 2-3
311-314
EN
The results of FIR reflectivity measurements for CdMnSe and CdFeSe are presented. These results are described theoretically using Dynamic Dielectric Function in which two phonon modes are included. The composition dependencies of mode parameters and dielectric constant are discussed.
5
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Spin-Lattice Relaxation of CdMnTe, Measured with a Pick-up Coil in a High Magnetic Field

100%
Strutz T., Witowski A., Wyder P.
Acta Physica Polonica A
|
1991
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vol. 79
|
issue 1
149-153
EN
The spin-lattice relaxation (SLR) time of Cd_{1-x}Mn_{x}Te with x=0.008 is measured directly under electron spin resonance condition in a magnetic field of 8.9 T, using a pick-up coil. The SLR times are measured for different sample temperatures between 3.0K and 35K and compared with data of a more diluted sample with x=0.002. The SLR times are shorter than expected for single spin SLR. Moreover, the temperature dependence of the SLR time does not show any of the characteristic behaviours for single spin SLR. Thus, the observed SLR times are explained by cross relaxation of single spins with spin clusters.
6
Content available remote

Changes of FIR Reflectivity of HgSe:Cr in a Magnetic Field

88%
Hausenblas M., Wyder P., Witowski A., Wittlin A., Mycielski A.
Acta Physica Polonica A
|
1992
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vol. 82
|
issue 5
741-744
EN
The results of FIR magnetoreflectivity of HgSe:Cr are presented. They are interpreted using a classical dynamic dielectric function.
7
Content available remote

Unusual Time Dependence of Magnetization Relaxation in MBE Grown Epilayer of CdMnTe

76%
Witowski A. M., Moll H. P., Wyder P., Karczewski G., Wojtowicz T., Kossut J.
Acta Physica Polonica A
|
1995
|
vol. 88
|
issue 5
953-956
EN
The temporal behavior of the magnetization due to the spin-lattice relaxation for bulk and MBE grown epilayer of CdMnTe is compared. The time dependence of the epilayer magnetization changes (dM/dt) is nonmonotonic. After the main part, a second structure appears. It can be explained only by the assumption of energy storage and a delayed additional rise of specimen temperature. The nature of the storage is unknown.
8
Content available remote

Spin-Lattice Relaxation Beyond the Debye Approximation

76%
Witowski A., Bardyszewski W., Kutter C., Wyder P., Witkowska B., Mycielski A.
Acta Physica Polonica A
|
1995
|
vol. 87
|
issue 2
533-535
EN
In this paper we present the results of magnetization relaxation in HgCdMnTe at high magnetic fields. In this mixed crystal the TA phonons have an energy lower than the spin splitting of the Mn^{2+} ground orbital singlet at about 20 T, which allows to check the effect of phonons with wave vectors from the edges of the Brillouin zone on the spin-lattice relaxation.
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