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Specific heat of Nd1-xCaxB6 single crystals


We measured the heat capacity on random alloys of Nd1-xCa xB6 (x< 0.4) in the 0.4 to 300 K temperature range. We calculated the lattice contribution to the specific heat, arising from the Debye-type phonons of the boron framework and Einstein-type oscillators of the cation sublattice. Subtracting lattice and Schottky-type contributions from the measured heat capacity, we find that the electronic portion, linear in temperature, decreases sharply upon doping with Ca. © 2011 American Physical Society.

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