Hyperfine interaction of the nitrogen donor in 4H-SiC
Hyperfine interaction of the nitrogen donor in 4H-SiC
复制标题
DOI：
10.1103/physrevb.70.193207
复制
发表时间：
2004-11-01
影响因子：
3.7
通讯作者：
Yamasaki, S
中科院分区：
文献类型：
--
作者：
Son, NT;Janzén, E;Yamasaki, S
采用电子顺磁共振（EPR）和电子核双共振（ENDOR）研究了N型4H-SiC的浅N给体。对于4H-SiC中立方位（N-k）的N给体，与最近邻（NN） Si-29原子沿c轴相互作用的超精细（hf）常数分别为A（平行）=41.07 MHz和A（垂直）=41.31 MHz。在ENDOR实验中证实了这种hf结构。在基面上观察到与其他三个NN Si原子的hf相互作用，确定了hf张量的主值为A(xx)=5.94 MHz， A(yy)=5.06 MHz， A(zz)=14.25 MHz。我们的EPR和ENDOR观察结果明确地证实了N给体占据了4H-SiC晶格中的C位，并且还揭示了N-k的相当大的自旋密度（接近23.9%），这在以前的研究中是没有得到的。
Shallow N donors in n-type 4H-SiC were studied by electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR). For the N donor at the cubic site (N-k) in 4H-SiC, the hyperfine (hf) constants of the interaction with the nearest-neighbor (NN) Si-29 atom along the c axis were determined as A(parallel to)=41.07 MHz and A(perpendicular to)=41.31 MHz. In ENDOR experiments, this hf structure was confirmed. The hf interaction with the other three NN Si atoms in the basal plane was observed and the principal values of the hf tensor were determined as A(xx)=5.94 MHz, A(yy)=5.06 MHz, and A(zz)=14.25 MHz. Our EPR and ENDOR observations unambiguously confirm that the N donor occupies the C site in the 4H-SiC lattice and also reveal a considerable amount of the spin density of N-k (similar to23.9%) which was not obtained in previous studies.