Artículos de revistas
First Principles Study Of The Ferromagnetism In Ga1-xmn Xas Semiconductors
Registro en:
Journal Of Physics Condensed Matter. , v. 16, n. 46, p. 8243 - 8250, 2004.
9538984
10.1088/0953-8984/16/46/011
2-s2.0-10044227463
Autor
Da Silva A.J.R.
Fazzio A.
Dos Santos R.R.
Oliveira L.E.
Institución
Resumen
We have performed ab initio calculations within the density-functional theory for Ga1-xMnxAs As diluted semiconductors. Total energy results unambiguously show that a quasi-localized ↓ hole, with predominant p-like character, surrounds the fully polarized Mn ↑ d 5-electrons. The calculations indicate that the holes form a relatively dispersionless impurity band, thus rendering effectivemass descriptions of hole states open to challenge. We obtain estimates both for the s = 1/2 hole and S = 5/2 Mn exchange coupling, and for the distance dependence of the effective Mn-Mn exchange interaction. The results demonstrate that the effective Mn-Mn coupling is always ferromagnetic, and thus non-RKKY, and is intermediated by the antiferromagnetic coupling of each Mn spin to the holes. 16 46 8243 8250 Ohno, H., Munekata, H., Penney, T., Von Molnàr, S., Chang, L.L., (1992) Phys. Rev. Lett., 68, p. 2664 Ohno, H., Shen, A., Matsukura, F., Oiwa, A., Endo, A., Katsumoto, S., Iye, Y., (1996) Appl. Phys. Lett., 69, p. 363 Van Esch, A., Van Bockstal, L., De Boeck, J., Verbanck, G., Van Steenbergen, A.S., Wellmann, P.J., Grietens, B., Borghs, G., (1997) Phys. Rev. B, 56, p. 13103 Matsukura, F., Ohno, H., Shen, A., Sugawara, Y., (1998) Phys. Rev. B, 57, pp. R2037 Ohno, H., (1999) J. Magn. Magn. Mater., 200, p. 110 Potashnik, S.J., Ku, K.C., Chun, S.H., Berry, J.J., Samarth, N., Schiffer, P., (2001) Appl. Phys. Lett., 79, p. 1495 Edmonds, K.W., Wang, K.Y., Campion, R.P., Neumann, A.C., Foxon, C.T., Gallagher, B.L., Main, P.C., (2002) Appl. Phys. Lett., 81, p. 3010 Seong, M.J., Chun, S.H., Cheong, H.M., Samarth, N., Mascarenhas, A., (2002) Phys. Rev. B, 66, p. 033202 Asklund, H., Iliver, L., Kanski, J., Sadowski, J., (2002) Phys. Rev. B, 66, p. 115319 Yu, K.M., Walukiewicz, W., Wojtowicz, T., Kuryliszyn, I., Liu, X., Sasaki, Y., Furdyna, J.K., (2002) Phys. Rev. B, 65, pp. R201303 Yu, K.M., Walukiewicz, W., Wojtowicz, T., Lim, W.L., Liu, X., Sasaki, Y., Dobrowolska, M., Furdyna, J.K., (2002) Appl. Phys. Lett., 81, p. 844 Potashnik, S.J., Ku, K.C., Mahendiran, R., Chun, S.H., Wang, R.F., Samarth, N., Schiffer, P., (2002) Phys. Rev. B, 66, p. 012408 Moriya, R., Munekata, H., (2003) J. Appl. Phys., 93, p. 4603 Dos Santos, R.R., Oliveira, L.E., D'Albuquerque e Castro, J., (2002) J. Phys.: Condens. Matter, 14, p. 3751 Dos Santos, R.R., Oliveira, L.E., D'Albuquerque e Castro, J., (2003) J. Appl. Phys., 93, p. 1845 Hayashi, T., Hashimoto, Y., Katsumoto, S., Iye, Y., (2001) Appl. Phys. Lett., 78, p. 1691 Dietl, T., Haury, A., Merle D'Aubigné, Y., (1997) Phys. Rev. B, 55, pp. R3347 Ohno, H., Matsukura, F., (2001) Solid State Commun., 117, p. 179 Okabayashi, J., Kimura, A., Rader, O., Mizokawa, T., Fujimori, A., Hayashi, T., Tanaka, M., (2001) Phys. Rev. B, 64, p. 125304 Singley, E.J., Kawakami, R., Awschalom, D.D., Basov, D.N., (2002) Phys. Rev. Lett., 89, p. 097203 Dietl, T., Ohno, H., Matsukura, F., (2001) Phys. Rev. B, 63, p. 195205 Abolfath, M., Jungwirth, T., Brum, J., MacDonald, A.H., (2001) Phys. Rev. B, 63, p. 054418 Sanvito, S., Ordejón, P., Hill, N.A., (2001) Phys. Rev. B, 63, p. 165206 Bouzerar, G., Kudrnovský, J., Berqvist, L., Bruno, P., (2003) Phys. Rev. B, 68, pp. 081203R Sandratskii, L.M., Bruno, P., (2002) Phys. Rev. B, 66, p. 134435 22nd Int. Conf. on Defects in Semiconductors (Aarhus, Denmark, 2003), , Preliminary results were presented at the Da Silva, A.J.R., Fazzio, A., Dos Santos, R.R., Oliveira, L.E., (2003) Physica B, 340-342, p. 874 Vanderbilt, D., (1990) Phys. Rev. B, 41, p. 7892 Kresse, G., Hafner, J., (1993) Phys. Rev. B, 47, pp. R558 Kresse, G., Furthmüller, J., (1996) Phys. Rev. B, 54, p. 11169 Kresse, G., Joubert, D., (1999) Phys. Rev. B, 59, p. 1758 Linnarsson, M., Janzén, E., Monemar, B., Kleverman, M., Thilderkvist, A., (1997) Phys. Rev. B, 55, p. 6938 Chapman, R.A., Hutchinson, W.G., (1967) Phys. Rev. Lett., 18, p. 443 Schneider, J., Kaufmann, U., Wilkening, W., Baeumler, M., Kohl, F., (1987) Phys. Rev. Lett., 59, p. 240 Zhao, Y.-J., Mahadevan, P., Zunger, A., (2004) Appl. Phys. Lett., 84, p. 3753 Zhao, Y.-J., Shishidou, T., Freeman, A.J., (2003) Phys. Rev. Lett., 90, p. 047204 Sanyal, B., Bengone, O., Mirbt, S., (2003) Phys. Rev. B, 68, p. 205210