Low-temperature specific heat of La0.78Pb0.22MnO3-d manganite
  The specific heat of the perovskite manganite La0.78Pb0.22MnO3-d was measured from 0.5 to 25 K. The results yield values of the electronic density of states, the Debye temperature, and the spin-wave stiffness constant of the compound. The magnetic contribution was found to be consistent with the existence of a gap in the spin-wave spectrum, and a phonon term in T^5 was needed to fit the data. 
L. Ghivelder (1), R.S. Freitas (1), R.E. Rapp (1), F.A.B. Chaves (1),   M. Gospodinov (2) and M.A. Gusmao (3) ((1) IF-UFRJ, ...