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Low-temperature specific heat of Li x NbS 2 </…

1986; American Physical Society; Volume: 33; Issue: 8 Linguagem: Inglês

10.1103/physrevb.33.5214

1095-3795

D. C. Dahn, J. F. Carolan, R. R. Haering,

2D Materials and Applications

We report measurements of the low-temperature specific heat of ${\mathrm{Li}}_{\mathrm{x}}$${\mathrm{NbS}}_{2}$, for 0\ensuremath{\le}x\ensuremath{\le}1. Samples were prepared by intercalating lithium into ${\mathrm{NbS}}_{2}$ in electrochemical cells. X-ray diffraction and electrochemical measurements show that staged phases exist for some values of x. The electronic specific heat of ${\mathrm{Li}}_{\mathrm{x}}$${\mathrm{NbS}}_{2}$ is consistent with complete charge transfer from the intercalated lithium to the bands of the ${\mathrm{NbS}}_{2}$ host. The lattice specific heat also exhibits large variations as a function of x. A discussion of the data in terms of continuum-elasticity theory suggests that intercalation produces large changes in the elastic constant ${c}_{44}$.