Magnetoresistance and Hall Effect in Electrochemically Doped $\beta $-Ag$_{2-\delta}$Te

The magnetoresistance (MR) and Hall effect of $\beta $-Ag$_{2-\delta }$Te are measured over a range of precise, electrochemically-established silver concentrations. In the extrinsic regime, positive MR is seen at all studied values of silver deficiency. However, it is largest and most linear within the narrow range of $\delta $ where the Hall coefficient abruptly changes sign.