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Structure differences of isotopically different dodecaborides LuNB12 (N = 10,11, natural) and their impact on thermal and charge transport characteristicsof the crystals have been first discovered. Atomic displacement parameters(ADPs) of Lu and B atoms are described in terms of the Einstein and Debyemodels, respectively. Characteristic Einstein and Debye temperatures arecalculated directly from the x-ray data and corresponding ADPs are separatedinto temperature dependent and temperature independent components. The firstcomponent is a measure of thermal atomic vibrations whereas the second one is asum of zero vibrations and static shifts of some atoms from theircrystallographic positions. Such a local disordering is more expressed inLunatB12 with 10B : 11B = 1 : 4 judging both from the large static ADPcomponents and the Schottky anomalies in the heat capacity. Crystal structuresare refined in Fm3-m group but certain distortions of the ideal cubic unit-cellvalues are observed in all three crystals under study due to cooperativeJahn-Teller effect. The distortions are mainly trigonal or mainly tetragonaldepending on the isotope composition. Low symmetry distribution of electrondensity reveals itself in LunatB12 in the form of the dynamic charge stripesoriented in selected directions close to some of <110>. The large static ADPcomponents of LunatB12 are surprisingly combined with high conductivity of thecrystal. One may suppose the static shifts (defects) are centers of pinningfacilitating formation of additional conductive channels.

Thermal and charge transport characteristics and fine details of the  crystal structure in dodecaborides LuNB12 (N = 10, 11, nat) with the  Jahn-Teller instability