Abstract
The specific heat ( C) of bi-layered manganites La 2−2 x Sr 1+2 x Mn 2O 7 ( x=0.3 and 0.5) is investigated for the ground state of low temperature excitations. A T 3/2 dependent term in the low temperature specific heat (LTSH) is identified at zero magnetic field and suppressed by magnetic fields for x=0.3 sample, which is consistent with a ferromagnetic metallic ground state. For x=0.5 sample, a T 2 term is observed and is consistent with a two-dimensional (2D) antiferromagnetic insulator. However, it is almost independent of magnetic field within the range of measured temperature (0.6–10 K) and magnetic field (6 T).
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