(La1−xBax)(Zn1−x

Abstract

We employ NMR techniques to investigate the nature of Mn spins in the I-II-V diluted magnetic semiconductor Li(Zn1−xMnx)P (x = 0.1, Curie temperature Tc = 25 K). We successfully identify the 7 Li NMR signals arising from the Li sites adjacent to Mn 2+ , and probe the static and dynamic properties of Mn spins. From the NMR spin-lattice relaxation data, we show that the Mn spin-spin interactions extend over many unit cells.

Li(Zn,Co,Mn)As: A bulk form diluted magnetic semiconductor with Co and Mn co-doping at Zn sites

“…This feature is also observed in other DMSs systems. 25,27,35 Only co-doping with Co and Mn into the Zn sites, can the system obtain the ferromagnetic ordering, as discussing below. The effect of Co and Mn doping on the ferromagnetism was studied by changing concentration of one dopant while fixing another one.…”

“…4,36 The direct antiferromagnetic coupling between the Mn-Mn pairs causes antiferromagnetic order in LiMnAs with T N = 373.8 K. 37 Similar results were found in other previously reported DMSs. 11,17,18,20,25,35 We fixed Mn content at the level of 15%, and enhanced the doping levels of Co from 5% to 15%. Figure 2c …”

(Sr 3 La 2 O 5 )(Zn 1−x Mn x ) 2 As 2 : A bulk form diluted magnetic semiconductor isostructural to the “32522” Fe-based superconductors

“…The resistivity of all samples monotonically increases toward lower temperature. This type of behavior in Mn doped specimens has been observed in heavily doped region of (Ga 1−x Mn x )As [6], as well as (La,Ba)(Zn,Mn)AsO [9] and (Ba,K)(Zn,Mn) 2 As 2 [12] DMS polycrystals. It has been ascribed to the scattering of carriers by the magnetic fluctuations through exchange interactions in (Ga 1−x Mn x )As [6].…”

“…µSR has demonstrated that the exchange interaction supporting ferromagnetic coupling in Li(Zn,Mn)As, (La,Ba)(Zn,Mn)AsO, (Ba,K)(Zn,Mn) 2 As 2 and (Ga,Mn)As has a common origin and comparable magnitude for a given spatial density of ordered moments, no matter the specimens are thin films or bulk forms [7,9,12,16]. Moreover, Ding et al has conducted 7 Li NMR measurement of Li(Zn,Mn)P, and successfully detected the fast relaxed Li sites that have Mn at nearest neighbor sites.…”

“…More recently, several more bulk DMS systems have been reported. Firstly, Ding et al reported the ferromagnetic ordering below T C ∼ 40 K in a "1111" type (La,Ba)(Zn,Mn)AsO system [9]; Han et al reported the ferromagnetism in (La,Ca)(Zn,Mn)SbO semiconductor [10] and Yang et al reported the fabrication of (La,Sr)(Cu,Mn)SO DMS with T C ∼ 210 K [11]. Secondly, Zhao et al reported the "122" type DMS systems, (Ba,K)(Zn,Mn) 2 As 2 , which has T C as high as 180 K [12], and Yang et al observed the ferromagnetic transition below T C ∼ 17 K and a large negative magnetoresistance in (Ba,K)(Cd,Mn) 2 As 2 [13].…”