Variation of the metallic onset with magnetic field in doped germanium

T. F. Rosenbaum, S. B. Field, R. N. Bhatt

Research output: Contribution to journalArticle

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Abstract

We demonstrate substantial magnetic-field tuning of the metal-insulator transition in Ge:Sb for H < 20 kOe. From a fit to the conductivity in a series of samples at millikelvin temperatures in different fields to the critical form σ ∼ (n/nc(H) - 1)μ, we find that μ ≈ 1 independent of H, but that nc(H) increases more than 25% by H ∼ 20 kOe. Moreover, nc(H) - nc(0) ∝ H1/2, in agreement with a weak-disorder perturbative scaling approach, but in contrast to recent experimental results in Si:As.

Original languageEnglish (US)
Pages (from-to)269-274
Number of pages6
JournalEPL
Volume10
Issue number3
DOIs
StatePublished - Oct 1 1989

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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