L2(1) and XA Ordering Competition in Hafnium-Based Full-Heusler Alloys Hf(2)VZ (Z = Al, Ga, In, Tl, Si, Ge, Sn, Pb)

Authors

Xiaotian Wang, University of Wollongong, Southwest UniversityFollow
Zhenxiang Cheng, University of WollongongFollow
Wenhong Wang, Chinese Academy Of SciencesFollow

RIS ID

127902

Publication Details

Wang, X., Cheng, Z. & Wang, W. (2017). L2(1) and XA Ordering Competition in Hafnium-Based Full-Heusler Alloys Hf(2)VZ (Z = Al, Ga, In, Tl, Si, Ge, Sn, Pb). Materials, 10 (10), 1200-1-1200-15.

Abstract

For theoretical designing of full-Heusler based spintroinc materials, people have long believed in the so-called Site Preference Rule (SPR). Very recently, according to the SPR, there are several studies on XA-type Hafnium-based Heusler alloys X2YZ, i.e., Hf2VAl, Hf2CoZ (Z = Ga, In) and Hf2CrZ (Z = Al, Ga, In). In this work, a series of Hf2-based Heusler alloys, Hf2VZ (Z = Al, Ga, In, Tl, Si, Ge, Sn, Pb), were selected as targets to study the site preferences of their atoms by first-principle calculations. It has been found that all of them are likely to exhibit the L21-type structure instead of the XA one. Furthermore, we reveal that the high values of spin-polarization of XA-type Hf2VZ (Z = Al, Ga, In, Tl, Si, Ge, Sn, Pb) alloys have dropped dramatically when they form the L21-type structure. Also, we prove that the electronic, magnetic, and physics nature of these alloys are quite different, depending on the L21-type or XA-type structures.