Abstract
Electrical resistivity, magnetoresistance and their temperature dependences in (SNBr y ) x are measured for various quantity of y . By bromination, negative magnetoresistance is enhanced at 4.2 K and also appears even at 77 K, at which temperature negative magnetoresistance is not observed in undoped (SN) x . These features are remarkable for the samples heavily doped and just after doping, and are abated by pumping bromine from (SNBr y ) x for a few days. The possible origins for the anomalous negative magnetoresistance are discussed taking the surface state of fiber bundles or crystal due to adsorped bromine into consideration.
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