Insight into the physics of the 5f -band antiferromagnet U2Ni2Sn from the pressure dependence of crystal structure and electrical resistivity

La2Pd2In: superconductivity and lattice properties at ambient and elevated pressures

“…The explanation of the softer a-direction may be the same as in the case of temperature variations. Similar situation, but with a higher k a /k c ratio, was observed for isostructural U 2 Ni 2 Sn, with k a = 0.0063 GPa −1 , k c ≈ 0, giving B = (80 ± 10) GPa [2]. The softer bonding within the basal plane of the rare-earth based R 2 T 2 X tetragonal compounds can be expected due to more degrees of freedom of atomic arrangement, but it has not been attested yet in number of cases sufficient to speak about a general tendency or a rule.…”

“…Fitting results in the following parameters: ρ 0 = 13.90 μΩ cm, A = 52.62 μΩ cm, θ D = 213 K, c = 0.91 and T 0 = 64 K. Similarly, for electrical current applied along the crystallographic a-direction, the best fit was also obtained using equation (2). The resulting parameters are ρ 0 = 35.24 μΩ cm, A = 84.24 μΩ cm, θ D = 213 K, c = 0.36 and T 0 = 51 K.…”

“…This layered crystal * Author to whom any correspondence should be addressed. structure with the sheets of R atoms alternating along the crystallographic c-axis with the T -X (T = transition element, X = p-metal) sheets represents a playground for investigation of possible Shastry-Sutherland type of geometrical frustration, for variations of magnetism due to 5 f -d hybridization, or for effects caused by H absorption [1][2][3]. Besides magnetic compounds, the non-magnetic ones with R = La, Lu, or Y are interesting as background substances, needed to distinguish effects related to magnetic moments formation and ordering.…”

Heavy-Fermion Properties of Yb2Pd2SnH≈2

“…Similar values of internal parameters characterizing the Yb positions in Yb2Pd2Sn and its hydride indicate that the basal-plane square motif of Yb atoms reacts to hydrogenation by practically isotropic expansion. The absence of significant rotation of the square, permitted otherwise within the given tetragonal symmetry (and attested in some R2T2X compounds, e.g., as due to thermal expansion or external pressure [42]), suggests the absence of any dramatic impact of hydrogenation on the effective size of Yb atoms. We can assume that if the Yb size varied it would mainly impact the Yb-Yb distance within each dimer, which gives a rotation of the Yb square motif within the basal plane.…”