Abstract
CdS has been known to exist in both a hexagonal (wurtzite) and cubic (zincblende) phase. In both cases the electronic structure has been reasonably well defined. Recently, by means of pressurisation and quenching, a metastable cubic (sodium chloride) phase has been shown to exist as well as 77K and standard pressure. In addition, several groups have reported both diamagnetic and paramagnetic anomalies in CdS. It seems reasonable to assign these anomalies partly to extrinsic influences. Nonetheless, recent evidence indicates the NaCl phase of CdS is host to the diamagnetic anomaly. In this letter, the authors present band structure results for both cubic phases of CdS.