Variation of the metallic onset with magnetic field in doped germanium

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

doi:10.1209/0295-5075/10/3/014

Variation of the metallic onset with magnetic field in doped germanium

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

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11 Scopus citations

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/n_c(H) - 1)^μ, we find that μ ≈ 1 independent of H, but that n_c(H) increases more than 25% by H ∼ 20 kOe. Moreover, n_c(H) - n_c(0) ∝ H^1/2, in agreement with a weak-disorder perturbative scaling approach, but in contrast to recent experimental results in Si:As.

Original language	English (US)
Pages (from-to)	269-274
Number of pages	6
Journal	EPL
Volume	10
Issue number	3
DOIs	https://doi.org/10.1209/0295-5075/10/3/014
State	Published - Oct 1 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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title = "Variation of the metallic onset with magnetic field in doped germanium",

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.",

author = "Rosenbaum, {T. F.} and Field, {S. B.} and Bhatt, {R. N.}",

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T1 - Variation of the metallic onset with magnetic field in doped germanium

AU - Rosenbaum, T. F.

AU - Field, S. B.

AU - Bhatt, R. N.

PY - 1989/10/1

Y1 - 1989/10/1

N2 - 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.

AB - 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.

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SP - 269

EP - 274

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Variation of the metallic onset with magnetic field in doped germanium

Abstract

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