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Variation of the Metallic Onset with Magnetic Field in Doped Germanium

Rosenbaum, T. F. and Field, S. B. and Bhatt, R. N. (1989) Variation of the Metallic Onset with Magnetic Field in Doped Germanium. Europhysics Letters, 10 (3). pp. 269-274. ISSN 0295-5075. doi:10.1209/0295-5075/10/3/014.

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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) α H^(1/2), in agreement with a weak-disorder perturbative scaling approach, but in contrast to recent experimental results in Si:As.

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Additional Information:© 1989 Europhysics Letters Association (EPLA). (received 2 May 1989; accepted in final form 21 July 1989) We are grateful to H. FRITZSCH for generously supplying the crystals used in this experiment. RNB and TFR acknowledge the hospitality of the Aspen Center for Physics where part of this work was accomplished. The work at The University of Chicago was supported by the National Science Foundation under Grant No. DMR85-17478.
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Issue or Number:3
Classification Code:PACS. 71.30 - Metal-insulator transitions. PACS. 71.555 - Localization in disordered structures. PACS. 75.30K - Magnetic phase boundaries (inc. magnetic transitions, metamagnetism, etc.).
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47027
Deposited By: George Porter
Deposited On:08 Jul 2014 21:18
Last Modified:12 Jul 2022 19:48

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