Optimizing Tc in the (Mn,Cr,Ga)As and (Mn,Ga)(As,P) Ternary Alloys

J. L. Xu; M. van Schilfgaarde

doi:10.1016/j.jmmm.2005.11.039

paper

Optimizing Tc in the (Mn,Cr,Ga)As and (Mn,Ga)(As,P) Ternary Alloys

arXiv:cond-mat/0510440 · doi:10.1016/j.jmmm.2005.11.039

Abstract

We explore two possible ways to enhance the critical temperature $T_{c}$ in the dilute magnetic semiconductor Mn $_{0.08}$ Ga $_{0.92}$ As. Within the context of the double-exchange and RKKY pictures, the ternary alloys Mn $_{x}$ Cr $_{0.08 - x}$ Ga $_{0.92}$ As and Mn $_{0.08}$ Ga $_{0.92}$ As $_{y}$ P $_{1 - y}$ might be expected to have $T_{c}$ higher than the pseudobinary Mn $_{0.08}$ Ga $_{0.92}$ As. To test whether the expectations from model pictures are confirmed, we employ linear response theory within the local-density approximation to search for theoretically higher critical temperatures in these ternary alloys. Our results show that neither co-doping Mn with Cr, nor alloying As with P improves $T_{c}$ . Alloying with Cr is found to be deleterious to the $T_{c}$ . Mn $_{0.08}$ Ga $_{0.92}$ As $_{y}$ P $_{1 - y}$ shows almost linear dependence of $T_{c}$ on $y$ .

10 pages, 5 figures

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