Low-temperature properties ofYbAl2

Crystal structure and physical properties of a new intermetallic compound URu2Al10

“…6) gives g ¼ 23(1) mJ mol À1 K À2 and q D ¼ 384(1) K. The latter value is in order of magnitude of Debye temperatures reported for uranium-based intermetallics [40,41]. The value of the Sommerfeld coefficient is much smaller than values reported for many spinfluctuating compounds (142 mJ mol À1 K À2 for UAl 2 [24], 89 mJ mol À1 K À2 for UAl 4 [15]) but such moderate values are encountered in intermediate valence aluminides such as YbAl 2 (15 mJ mol À1 K À2 ) [42] or CeFe 2 Al 10 (14 mJ mol À1 K À2 ) [10].…”

Photoemission Evidence for Valence Fluctuations and Kondo Resonance in YbAl2

“…However, Yb 2+ and Yb 3+ components in spectra are rela- 10 For YbAl 2 , the sharp rise at low T in the magnetic susceptibility has also been attributed to the surface Yb 2 O 3 as an impurity. 13,15,18 In our HAXPES measurements using in-situ-fractured single crystals of YbAl 2 , no O-1s signal has been detected. Therefore, the major difference in estimating Yb valence using XAS and our HAXPES results can be due to the surface oxidation of powder samples in XAS.…”

“…The electrical resistivity shows a normal metallic behavior without a coherence peak in the temperature (T ) range below 300 K. [13][14][15][16] The electronic specificheat coefficient, which provides a measure of effective electron mass, exhibits a slightly enhanced value, ∼10-17 mJ/K 2 mol. [14][15][16] The magnetic susceptibility has a broad maximum (T max ) at 800-850 K and is nearly independent of T below 300 K after subtracting the impurity contribution. 13,15,17,18 The Kondo T (T K ) has been estimated as 2000-2600 K from the 3T max or the inelastic neutron scattering.…”

“…[14][15][16] The magnetic susceptibility has a broad maximum (T max ) at 800-850 K and is nearly independent of T below 300 K after subtracting the impurity contribution. 13,15,17,18 The Kondo T (T K ) has been estimated as 2000-2600 K from the 3T max or the inelastic neutron scattering. 19 The Yb valence has been investigated by some techniques such as the lattice parameters 17,20 and the x-ray absorption spectroscopy (XAS) at the Yb-L III edge.…”

High Quality Single-Crystal Growth and De Haas–Van Alphen Measurements of YbAl2

“…Here, we focus on YbAl 2 , which has been a much-studied compound and known to [13][14][15]. The temperature dependence of the electrical resistivity is a normal metallic.…”