Anomalous thermal expansion in superconducting Mg(1-x)Al(x)B(2) system RID A-8473-2008

The thermal lattice expansion in the superconducting Mg(1-x)Al(x)B(2) system (x = 0, 0.13, and 0.59) has been measured using high-resolution X-ray powder diffraction. An unusual large negative thermal expansion (NTE) appears for temperatures below T* = 60 K in the MgB(2). The NTE effect increases in Mg(0.87)Al(0.13)B(2) and disappears at high Al content in the Mg(0.59)Al(0.41)B(2) where the temperature dependence of volume follows a Standard Einstein model in the whole temperature range. The anomalous behavior of the thermal expansion provides a direct evidence in the physics of diborides for the relevance of the proximity to the 2.5 Lifshitz electronic topological transition where the Fermi surface of the sigma band changes from a two-dimensional (2D) to a three-dimensional (3D) topology