Evidence of metallic clustering in annealed Ga1-xMn xAs from atypical scaling behavior of the anomalous Hall coefficient

H. K. Choi, Y. S. Kim, S. S.A. Seo, I. T. Jeong, W. O. Lee, Y. S. Oh, K. H. Kim, J. C. Woo, T. W. Noh, Z. G. Khim, Y. D. Park, S. H. Chun

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14 Scopus citations

Abstract

The anomalous Hall coefficient (Rs) and longitudinal resistivity (ρxx) scaling relationship (Rs = cρ xxn) for a series of annealed Ga1-xMn xAs epilayers (x ≈ 0.055) are investigated. As-grown samples exhibit a scaling parameter n ∼ 1 and samples annealing near the optimal annealing temperature, n ∼ 2. For annealing temperatures far above the optimum they observe scaling with n > 3, which is similar to the behavior of certain inhomogeneous systems. Optical spectroscopy measurements also reveal an enhancement of the absorption coefficient in these samples for photons of energy around 1 eV. These atypical behaviors are characteristic of spherical resonance from metallic inclusions.

Original languageEnglish
Article number102503
JournalApplied Physics Letters
Volume89
Issue number10
DOIs
StatePublished - 2006

Bibliographical note

Funding Information:
This work was supported by KOSEF through CSCMR. Two of the authors (Y.D.P. and K.H.K.) acknowledge partial support from the City of Seoul R&BD Program. Another two authors (S.S.A.S. and T.W.N.) acknowledge support from MOST through CRI.

Funding

This work was supported by KOSEF through CSCMR. Two of the authors (Y.D.P. and K.H.K.) acknowledge partial support from the City of Seoul R&BD Program. Another two authors (S.S.A.S. and T.W.N.) acknowledge support from MOST through CRI.

FundersFunder number
City of Seoul R&BD
Ministry of Science and Technology
Korea Science and Engineering Foundation

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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