3D-melting features of the irreversibility line in overdoped Bi2Sr2CuO6 atultra-low temperature and high magnetic field

We have measured the irreversible magnetization of an overdoped Bi2Sr2CuO6 single crystal up to B = 28 T and down to T = 60 mK, and extracted the irre versibility line B-irr(T): the data can be interpreted in the whole tempera ture range as a 3D-anisotropic Vortex lattice melting line with Lindemann n umber c(L) = 0.13. We also briefly discuss the applicability of alternative models such as 2D- and quantum melting, and the connection with magnetores istance experiments.