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By K.H.J. Buschow Ph.D.

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Sample text

The solid lines show the fitting using eq. (2) (Omiya et al. 2000). (Ohno et al. 1992), and an increase in the hole kinetic energy due to giant spin-splitting, are suggested as mechanisms leading to the enhanced conductivity in the magnetic field. The latter can be particularly strong in p-type materials, in which the exchange splitting mixes heavy and light hole subbands (Wojtowicz et al. 1986). MnjAs (T and B dependence) by using Zubarev's double-time Green's function rather well (Kuivalainen 2001).

B is the Bohr magneton, kB is the Boltzmann constant. Judging from this value of S, some ferromagnetic clusters exist already above Tc ; Magnetization measurements on semi-insulating (Ga,Mn)As:Sn, in which the holes are compensated by Sn donors, point to a paramagnetic behavior. The Curie-Weiss (l/X-T) plot gives TAF '" 2 K, indicating that the "intrinsic" mechanism of the interaction between the Mn spins is the antiferromagnetic superexchange (Satoh et al. 1997,2001). This means that the ferromagnetic coupling in (Ga,Mn)As is induced by the presence of the holes.

1b~~~~ ~ 1 , ~ ( ij .... ~. ;.... _'~ . . • ll:. / 03 • . • . 30CK -5 o -5 .. ~. 08 ...... o::lIls: ............ 08 X Fig. 13. (a) Temperature dependence of the Hall resistance RHaJl for the same sample as in fig. II. The inset shows the temperature dependence of the sheet resistance Rsheet. (b) Temperature dependence of the saturation magnetization [RHaJlI RsheedS obtained using Arrott plots (closed circles) and inverse susceptibility I/XHaJl (open circles), both from the transport data shown in (a).

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