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Structural and magnetic properties of the Shastry-Sutherland material Yb2Pt2Pb were studied in single-crystalline form under pressures up to 10 GPa, magnetic fields up to 17 T, and temperatures down to 0.3 K. Surprisingly robust magnetic order is observed with the Néel temperature TN = 2.1 K stable up to 8.1 GPa. Indication of an additional magnetic phase formation can be traced in resistivity data for magnetic field along the c-axis exceeding the (pressure-dependent) metamagnetic transition. The related anomaly shifts to higher temperatures with increasing field, merging TN at the tricritical point. Experiments with μ0H // [110] revealed the pressure stabilization of observed magnetic phases with respect to the magnetic field. The crystal-structure type is stable up to 10 GPa, without any sign of symmetry change, exhibiting moderate volume compressibility with bulk modulus B = 116(13) GPa, in good agreement with B = 118 GPa provided by the density functional theory. [ABSTRACT FROM AUTHOR]

We present an infrared crystal-field study of Pr2CuO4 single crystals and thin films. Excitations from the ground state multiplet 3H4 to the 3H5, 3H6, 3F2 and 3F3 excited multiplets are observed in both single crystals and thin films. A precise set of crystal-field parameters, that reproduces the energy and the symmetry of the levels, is determined. [ABSTRACT FROM AUTHOR]

A theoretical investigation of the rare earth (R[sup 3+]) localized 4f electron states and band energy spectrum of RGa[sub 2] intermetallics and RNi[sub 2]B[sub 2]C borocarbides is presented. To calculate the crystal field interaction, we used a parameterfree first-principles method based on density functional theory. It is shown that a reasonable and parameter-free theoretical description of the inelastic neutron scattering can be achieved, as is demonstrated for the particular cases DyGa[sub 2] and NdNi[sub 2]B[sub 2]C. [ABSTRACT FROM AUTHOR]