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- Oh, Yoon Seok
- Laboratory for Strong Correlation in Quantum Materials
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Evidence of metallic clustering in annealed Ga1-xMnxAs from atypical scaling behavior of the anomalous Hall coefficient
- Author(s)
- Choi, HK, Kim, YS, Seo, SSA, Jeong, IT, Lee, WO, Oh, Yoon Seok, Kim, KH, Woo, JC, Noh, TW, Khim, ZG, Park, YD, Chun, SH
- Issued Date
- 2006-09
- Citation
- APPLIED PHYSICS LETTERS, v.89, no.10, pp.102503
- Abstract
- The anomalous Hall coefficient (Rs) and longitudinal resistivity (Ï xx) scaling relationship (RS=cÏ xxn) for a series of annealed Ga1-xMnxAs 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.
- Publisher
- AMER INST PHYSICS
- ISSN
- 0003-6951
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