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Magnetic Properties of a Novel CeCo_{0.715}Si_{2.285} Compound

100%

Moudřík J., Prokleška J., Pospíšil J., Sechovský V., Císařová I.

We report on the basic physical properties of a novel CeCo_{0.715}Si_{2.285} compound, mainly its rich magnetic phase diagram. The compound crystallizes in the I-4m2 space group structure with extremely elongated unit cell (a = 4.12 Å, c = 32.84 Å). In a zero magnetic field it orders antiferromagnetically at T_{N} = 10.5 K with another order-to-order transition at 9.5 K. Under application of a magnetic field along the c-axis it manifests numerous magnetic transitions in small fields (B < 500 mT), resembling the so-called "devil's staircase" systems. Above 1 T the magnetization is almost constant up to 14 T (maximum magnetic field applied within our study) but considerably reduced (0.3 μ_B/Ce) with respect to the free Ce^{3+} ion. After removing the applied field, however, the high field state remains unchanged to be removed in negative fields. The compound also exhibits strong hysteresis of magnetization with respect to varying temperature or magnetic field. For fields applied along the a-axis typical behavior for the hard axis in the material with uniaxial anisotropy is observed.

Magnetism in UCo_{0.88}Ru_{0.12}Ge Studied by Polarized Neutrons

86%

Vališka M., Pospíšil J., Nénert G., Stunault A., Prokeš K., Sechovský V.

vol. 126

issue 1

330-331

UCoGe is an archetype of coexisting weak itinerant 5f-electron ferromagnetism (T_{C}~3 K, μ_{s}=0.03μ_{B}/f.u.) and superconductivity (T_{SC}~ 0.6 K) at ambient pressure. The Ru substitution for Co leads to an initial sharp increase of the T_{C} up to the maximum of T_{C}=8.5 K for x=0.12, increase of spontaneous magnetic moment and suppression of superconductivity. We have grown the UCo_{0.88}Ru_{0.12}Ge single crystal and studied magnetization along the principal crystallographic axes. To see the microscopic background of these findings we performed a polarized neutron diffraction experiment on D3 diffractometer in ILL. We have found that the Co and U moments are parallel in UCo_{0.88}Ru_{0.12}Ge, in contrast to the antiparallel configuration in UCoGe. This is probably the reason of the spontaneous magnetization increase with Ru doping.

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2 Acta Physica Polonica A

1 2015

1 2014

2 Pospíšil J.

2 Sechovský V.

1 Císařová I.

1 Moudřík J.

1 Nénert G.

1 Prokeš K.

1 Prokleška J.

1 Stunault A.

1 Vališka M.

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Magnetic Properties of a Novel CeCo_{0.715}Si_{2.285} Compound

Magnetism in UCo_{0.88}Ru_{0.12}Ge Studied by Polarized Neutrons