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Spin-glass ordering in diluted magnetic semiconductors: A Monte Carlo study



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Marinari, E. y Martín Mayor, Víctor y Pagnani, A. (2000) Spin-glass ordering in diluted magnetic semiconductors: A Monte Carlo study. Physical review B, 62 (8). pp. 4999-5002. ISSN 1098-0121

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URL Oficial: http://dx.doi.org/10.1103/PhysRevB.62.4999

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We study the temperature-dilution phase diagram of a site-diluted Heisenberg antiferromagnet on a facecertered-cubic lattice, with and without the Dzyaloshinskii-Moriya anisotropic term, fixed to realistic microscopic parameters for IIB_(1-x)Mn_(x)Te(IIB=Cd,Hg,Zn). We show that the dipolar Dzyaloshinskii-Moriya anisotropy induces a finite-temperature phase transition to a spin-glass phase, at dilutions larger than 80%. The resulting probability distribution of the order parameter P(q) is similar to the one found in the cubic lattice Edwards-Anderson-Ising model. The critical exponents undergo large finite-size corrections, but tend to values similar to the ones of the Edwards-Anderson-Ising model.

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© 2000 The American Physical Society. We acknowledge interesting discussions with D. Brogioli, B. Coluzzi, A. Geddo-Lehmann, G. Parisi, F. Ricci Tersenghi, and J. J. Ruiz-Lorenzo. V.M.M. is a M.E.C. fellow and has been partially supported by CICyT (AEN97- 1708 and AEN99-1693). The simulations have been performed using the Pentium clusters of the Università di Cagliari (Kalix2) and the Universidad de Zaragoza (RTNN collaboration). While this work was in proofs Professor C. L. Henley called our attention to Ref. 26.

Palabras clave:Antiferromagnetic RP(2) model; 3 dimensions; Computer-simulation; Critical exponents; Ising-model; Cd(1-x)Mn(x)Te; Dynamics; Cd(0.6)Mn(0.4)Te; Zn(1-x)Mn(x)Te.
Materias:Ciencias > Física > Física-Modelos matemáticos
Código ID:46808
Depositado:22 Mar 2018 09:17
Última Modificación:22 Mar 2018 09:17

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