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Probing 3d-4f Exchange Interactions by High-Field Magnetization Measurements

100%

Skourski Y., Kuz'min M., Skokov K., Müller K., Wosnitza J.

Acta Physica Polonica A

2009

vol. 115

issue 1

178-180

In a 4f-3d ferrimagnet the molecular field (a net value expressing the relevant exchange interactions) can be determined from high-field magnetization measurements. If the applied field is high enough, it breaks the ferrimagnetic ground state and drives the system towards ferromagnetic order via non-collinear intermediate phases. Magnetization curves of Er_2Fe_{17} singe crystal were measured along the [100] crystallographic direction in magnetic fields up to 50 T. An unfixed sample, free to rotate, was measured as well. The magnetization measured along the easy magnetization direction shows jumps at 37.5 and 44 T. The first jump was used for the determination of the molecular field (66.4 T). This agrees with the data for the unfixed sample where a kink in the magnetization at 33.5 T yields a molecular field of 65.7 T. The obtained values are in a good agreement with literature data.

EPR Study of the Two-Dimensional Quantum System Cu(en)(H_2O)_2SO_4

86%

Tarasenko R., Orendáčová A., Čižmár E., Orendáč M., Zvyagin S., Wosnitza J.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

1095-1097

The angular dependence of electron paramagnetic resonance spectra of Cu(en)(H_2O)_2SO_4 single crystals was studied in the X-band frequency range at temperatures 4 and 300 K. Analysis of the linewidth at 300 K revealed nice agreement with the angular variation of the g-factor. This coincidence is the manifestation of the symmetric and antisymmetric exchange coupling, as main broadening mechanisms in Cu(en)(H_2O)_2SO_4 at high temperatures. The radical change of the angular dependence of the linewidth observed at 4 K can be ascribed to dipolar coupling.

Neutron and EPR Study of Cu(tn)Cl_{2} - a~Two-Dimensional Spatially Anisotropic Triangular-Lattice Antiferromagnet

59%

Tarasenko R., Orendáčová A., Čižmár E., Maťaš S., Orendáč M., Zeleňák V., Pavlík V., Siemensmeyer K., Zvyagin S., Wosnitza J., Feher A.

Acta Physica Polonica A

2014

vol. 126

issue 1

232-233

We have studied the temperature dependence of the lattice parameters and the influence of spin anisotropy on the electron paramagnetic spectra of Cu(tn)Cl_2, an S=1/2 quasi-two-dimensional spatially-anisotropic triangular-lattice Heisenberg antiferromagnet. The variation of the resonance fields with temperature reflects the presence of an easy-plane exchange anisotropy with J_{z}/J_{x,y}<1 and g-factor anisotropy, g_{z}/g_{x,y}>1.

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3 Acta Physica Polonica A

1 2014

1 2012

1 2009

3 Wosnitza J.

2 Orendáč M.

2 Orendáčová A.

2 Tarasenko R.

2 Zvyagin S.

2 Čižmár E.

1 Feher A.

1 Kuz'min M.

1 Maťaš S.

1 Müller K.

1 Pavlík V.

1 Siemensmeyer K.

1 Skokov K.

1 Skourski Y.

1 Zeleňák V.

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Probing 3d-4f Exchange Interactions by High-Field Magnetization Measurements

EPR Study of the Two-Dimensional Quantum System Cu(en)(H_2O)_2SO_4

Neutron and EPR Study of Cu(tn)Cl_{2} - a~Two-Dimensional Spatially Anisotropic Triangular-Lattice Antiferromagnet