Linear magnetoresistance in n-type silicon due to doping density fluctuations.

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 Rep

journal_title

Scientific reports

authors

Porter NA,Marrows CH

doi

10.1038/srep00565

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

565

issn

2045-2322

journal_volume

2

pub_type

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