Abstract:
:We report the observation of a large linear magnetoresistance in the ohmic regime in commonplace commercial n-type silicon wafer with a P dopant density of (1.4±0.1) ×10(15) cm(-3), and report measurements of it in the temperature range 30-200 K. It arises from the deformation of current paths, which causes a part of the Hall field to be detected at the voltage probes. In short, wide samples we found linear magnetoresistance as large as 4707% in an 8 tesla field at 35 K. Sample geometry effects like these are commonplace in commercial Hall sensors. However, we found that the effect persisted in long, thin samples where the macroscopic current flow should be uniform between the voltage probes: we observed a magnetoresistance of 445% under the same conditions as above. We interpret this result as arising due to spatial fluctuations in the donor density, in the spirit of the Herring model.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Porter NA,Marrows CHdoi
10.1038/srep00565subject
Has Abstractpub_date
2012-01-01 00:00:00pages
565issn
2045-2322journal_volume
2pub_type
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