High pressure synthesis of a new phase of YbAg2: Structure, valence of Yb and properties
摘要:
The new phase of YbAg2 was obtained using high-pressure and high-temperature reaction. YbAg2 crystallizes in the MgZn2 structure (the space group P6(3)/mmc space group, No 194) with a = 5.68153(3) angstrom and c = 9.31995(7) angstrom and the unit cell volume V = 260.54(3) angstrom(3). The XANES analysis showed that the valence state of Yb is +2.8. The low-temperature dependences of the electrical resistivity and magnetic susceptibility can be adequately described by a T-2 term that supports the Fermi-liquid picture. The Kadowaki-Woods relation gives a low value of the degeneracy (N = 2). (C) 2015 Elsevier B.V. All rights reserved.