Suppression ofTCby overdoped Li in the diluted ferromagnetic semiconductorLi1+y(Zn<

Abstract

We use muon spin relaxation (μSR) to investigate the magnetic properties of a bulk form diluted ferromagnetic semiconductor (DFS) Li 1.15 (Zn 0.9 Mn 0.1)P with T C ∼ 22 K. μSR results confirm the gradual development of ferromagnetic ordering below T C with a nearly 100% magnetic ordered volume. Despite its low carrier density, the relation between static internal field and Curie temperature observed for Li(Zn,Mn)P is consistent with the trend found in (Ga,Mn)As and other bulk DFSs, indicating these systems share a common mechanism for the ferromagnetic exchange interaction. Li 1+y (Zn 1−x Mn x)P has the advantage of decoupled carrier and spin doping, where Mn 2+ substitution for Zn 2+ introduces spins and Li + off-stoichiometry provides carriers. This advantage enables us to investigate the influence of overdoped Li on the ferromagnetic ordered state. Overdoping Li suppresses both T C and saturation moments for a certain amount of spins, which indicates that more carriers are detrimental to the ferromagnetic exchange interaction, and that a delicate balance between charge and spin densities is required to achieve highest T C .

Single Crystal Growth and Spin Polarization Measurements of Diluted Magnetic Semiconductor (BaK)(ZnMn)2As2

“…the "111" type Li(Zn,Mn)As、 "122" type (Ba,K)(Zn,Mn) 2 As 2 and "1111" type (La,Ca)(Zn,Mn)SbO, which are named by the chemical ratio of their parent phases. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Among these new DMSs, the ThCr 2 Si 2 type (Ba,K)(Zn,Mn) 2 As 2 has a Curie temperature (Tc) up to 230 K which marks the current reliable record Tc for DMSs where ferromagnetism is mediated by carriers. [12][13] The (Ba,K)(Zn,Mn) 2 As 2 is believed to be one of milestone materials for the research of DMSs.…”

Ba(Zn1−2xMnxCux)2As2: A Bulk Form Diluted Ferromagnetic Semiconductor with Mn and Cu Codoping at Zn Sites

“…It has been shown from NMR20 and μ SR measurements that the ferromagnetism in (BaK)(ZnMn) 2 A s 2 9, Li(Zn, Mn)As10, (La, Ba)(Zn, Mn)AsO12 and Li(Zn, Mn)P21 are homogeneous, i.e., the long range ferromagnetic ordering is arising from the Mn atoms doped at Zn sites, instead of Mn related magnetic impurities. Furthermore, μ SR results demonstrated that these bulk form DMSs share the same mechanism for the ferromagnetic ordering as that of (Ga, Mn)As22.…”

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

“…After this discovery, several new types of bulk forms of DMSs with decoupled spins and charges injections have been reported. [17][18][19][20][21][22][23][24][25][26][27] The availability of bulk forms of specimens make it possible to investigate the microscopic magnetism of DMSs based on typical bulk probes, 28 such as nuclear magnetic resonance (NMR), 29 muon spin relaxation (µSR), 17,18,20,30 neutron scattering, absorption spectroscopy (XAS), 31 resonance photoemission spectroscopy (RPES), 31 and angle-resolved photoemission spectroscopy (ARPES). 32 It has been confirmed by the XAS measurements that the valence of Mn in (Ba,K)(Zn,Mn) 2 As 2 is bivalence.…”