Abstract
Single crystals of YbAlB4 were grown in excess Al flux. Plate- and needle-shaped crystals were found. The plates are found to be s-YbAlB4, which crystallizes with the ThMoB4 structure type in space group Cmmm (No. 65), Z = 4, with lattice parameters of a = 7.3080(4), b = 9.3150(5), and c = 3.4980(2) A. The needle-shaped crystals were identified as the first form of YbAlB4 which crystallizes with the YCrB4 structure type in space group Pbam (No. 55), Z = 4, with lattice parameters of a = 5.9220(2), b = 11.4730(3), and c = 3.5060(5) A. While both compounds have heavy fermion ground states with Isinglike magnetic anisotropy, the electronic specific heat coefficients (γ) differ. The s-phase has a γ value near 300 mJ mol -1 K-2, more than twice that of the α-phase, γ = 130 mJ mol-1 K-2. A comparison of the structures and physical properties of both polymorphs is presented. © 2007 American Chemical Society.
Highlights
Ytterbium compounds show a wide range of physical properties
The plates are found to be -YbAlB4, which crystallizes with the ThMoB4 structure type in space group Cmmm (No 65), Z ) 4, with lattice parameters of a ) 7.3080(4), b ) 9.3150(5), and c ) 3.4980(2) Å
The needle-shaped crystals were identified as the first form of YbAlB4 which crystallizes with the YCrB4 structure type in space group Pbam (No 55), Z ) 4, with lattice parameters of a ) 5.9220(2), b ) 11.4730(3), and c ) 3.5060(5) Å
Summary
The plates are found to be -YbAlB4, which crystallizes with the ThMoB4 structure type in space group Cmmm (No 65), Z ) 4, with lattice parameters of a ) 7.3080(4), b ) 9.3150(5), and c ) 3.4980(2) Å. The needle-shaped crystals were identified as the first form of YbAlB4 which crystallizes with the YCrB4 structure type in space group Pbam (No 55), Z ) 4, with lattice parameters of a ) 5.9220(2), b ) 11.4730(3), and c ) 3.5060(5) Å. While both compounds have heavy fermion ground states with Isinglike magnetic anisotropy, the electronic specific heat coefficients (γ) differ. A comparison of the structures and physical properties of both polymorphs is presented
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