Ne. Hussey et al., EMPIRICAL CORRELATION BETWEEN T-C AND THE TEMPERATURE-DEPENDENCE OF THE ELECTRONIC SPECIFIC-HEAT OF SUPERCONDUCTING LA2-XSRXCUO4 AT LOW-TEMPERATURES, Europhysics letters, 29(5), 1995, pp. 383-388
We report precise measurements of the specific heat of seven samples o
f superconducting La2-xSrxCuO4 (0.05 less than or equal to x less than
or equal to 0.27) between 0.09 K and 1.5 K. When phonon and nuclear t
erms are subtracted, the remaining, electronic, specific heat has the
form alpha T-n, where n <1 for an samples and shows a smooth correlati
on with T-c, having a minimum value in the optimally doped sample, x =
0.15. We discuss the possibility that this unconventional form of the
electronic specific heat arises from localisation of the quasi-partic
les at low temperatures.