Transport, Thermal, and Magnetic Properties of YbNi₃X₉(X= Al, Ga): A Newly Synthesized Yb-Based Kondo Lattice System

Photoemission Studies of Kondo Lattice Compounds YbNi3(Ga1−xAlx)9

“…In order to estimate the extrapolated peak energy position at zero temperature, we have fitted to the LEPES spectra assuming the single DoniachSunjuc function for the Kondo peak and the Fermi-Dirac distribution functions for the conductionband density of states [14]. From the temperature dependent peak energy, the Kondo temperature was estimated to be T K ∼ 550 K. This value is in good agreement with T K = 570 K estimated from the zero-temperature limit of the specific heat using the Bethe ansatz solution of the Coqblin-Schrieffer model for an orbitally degenerate Kondo impurity system [6,16]. increasing the Al concentration the Kondo peak is shifted toward E F , which indicates the decrease of T K .…”

“…We see that the Yb ion tends to favor the trivalent state with increasing the Al concentration as a whole. This result indicates that the c − f hybridization gradually decreases, leading to the Yb valence of nearly 3 in YbNi 3 Al 9 [5,6,8].…”

“…Clean surfaces of the samples were obtained by fracturing in situ. Single crystals of YbNi 3 (Ga 1−x Al x ) 9 with x = 0, 0.05, 0.10 and 0.15 were synthesized by self-flux method as described in the literatures [5,6]. The x-values presented here are nominal ones derived from a mixture ratio of starting materials.…”

“…YbNi 3 Al 9 is a heavy-fermion antiferromagnet with the Néel temperature of T N =3.4 K, while YbNi 3 Ga 9 is a valence fluctuating compound with non-magnetic state, as evidenced by the magnetic susceptibility measurements [5][6][7]. YbNi 3 Al 9 and YbNi 3 Ga 9 are, thus, located at the opposite sides of the quantum critical point (QCP) in the Doniach phase diagram.…”

Crystal Growth, Structural, Electrical, and Magnetic Properties of Mixed-Valent Compounds YbOs2Al10 and LuOs2Al10

“…28,52,57 The characterizing data obtained during this study reveals the mixed-valent nature of YbOs 2 Al 10 . The interatomic distances between the Yb and Os atoms in YbOs 2 Al 10 may reflect the degree of hybridization between the 4f orbitals and conduction electrons; 28,52,57 the Yb−Os distance is 3.4538(2) Å, slightly longer than 3.4241 Å found in YbFe 2 Al 10 and slightly shorter than 3.4606 Å observed in YbRu 2 Al 10 . The shorter distance implies a stronger hybridization, as was argued in studies of the Ce-based system.…”