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Angular Dependences of ESR Parameters in Antiferroquadrupolar Phase of CeB₆

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Semeno A., Gilmanov M., Sluchanko N., Krasnorussky V., Shitsevalova N., Filipov V., Flachbart K., Demishev S.

Acta Physica Polonica A

2017

vol. 131

issue 4

1060-1062

Angular dependences of ESR line parameters (g-factor and linewidth Δ H) were experimentally explored in the antiferroquadrupolar phase of heavy fermion system CeB₆ at T=1.8 K. The data were obtained in two experimental geometries with different mutual directions of the wavevector k and the external magnetic field H at frequency of f=60 GHz. A g-factor anisotropy was found: while g-factors for [110] and [111] directions are close to each other (g ≈1.6), it is considerably higher (g ≈1.75) for [100]. The obtained angular dependence g(Θ) was compared with the theoretically predicted g-factor behavior for the Γp₈ state of Ce³⁺ ion in antiferroquadrupolar phase of CeB₆. It turns out that the experimental g-factor is considerably smaller at all angles than the theoretically calculated limits (2

Anisotropy of Magnetoresistance in HoB₁₂

81%

Khoroshilov A., Krasnorussky V., Bogach A., Glushkov V., Demishev S., Levchenko A., Shitsevalova N., Filipov V., Gabáni S., Flachbart K., Anisimov M., Siemensmeyer K., Sluchanko N.

Acta Physica Polonica A

2017

vol. 131

issue 4

976-978

We present results of precision measurements of magnetoresistance of isotopically pure Ho¹¹B₁₂ at low temperatures 2÷10 K in magnetic field up to 80 kOe of different orientation to the crystal axes. The data obtained revealed strong anisotropy of magnetoresistance and allowed us to reconstruct magnetic H-T phase diagrams for main crystallographic directions H || [001], [110], and [111]. Analysis of magnetoresistance derivatives allowed to conclude in favor of two main magnetoresistance contributions. Among of them the negative quadratic component is attributed to charge carriers scattering on a magnetic clusters of Ho³⁺ ions (4f component) and positive linear one may be explained in terms of scattering on a spin density waves (5d component).

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2 Acta Physica Polonica A

2 2017

2 Demishev S.

2 Filipov V.

2 Flachbart K.

2 Krasnorussky V.

2 Shitsevalova N.

2 Sluchanko N.

1 Anisimov M.

1 Bogach A.

1 Gabáni S.

1 Gilmanov M.

1 Glushkov V.

1 Khoroshilov A.

1 Levchenko A.

1 Semeno A.

1 Siemensmeyer K.

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Angular Dependences of ESR Parameters in Antiferroquadrupolar Phase of CeB₆

Anisotropy of Magnetoresistance in HoB₁₂