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- W2073161778 abstract "A detailed study of optically detected magnetic resonance (ODMR) in photoluminescence is reported for the 1.911-eV Cu-related neutral complex defect in GaP. By excitation with a tunable dye laser directly in an excited state at around 2.002 eV associated with the 1.911-eV bound exciton (BE), quite strong ODMR signals are obtained. Separate recordings of differently polarized components of the ODMR spectra at 9 GHz give a considerably more accurate angular dependence of the ODMR spectrum than previously reported. The triplet 1.911-eV BE state can be described by the spin Hamiltonian scrH=${ensuremath{mu}}_{B}$Bensuremath{cdot}${mathrm{g}ensuremath{rightarrow}phantom{rule{0ex}{0ex}}}_{mathrm{ex}}$ensuremath{cdot}S+Sensuremath{cdot}Densuremath{rightarrow}ensuremath{cdot}S with the parameter values ${g}_{x}$=1.99ifmmodepmelsetextpmfi{}0.01, ${g}_{y}$=2.06ifmmodepmelsetextpmfi{}0.01, ${g}_{z}$=2.03ifmmodepmelsetextpmfi{}0.01, ${D}_{x}$=(-7.40ifmmodepmelsetextpmfi{}0.05)ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}6}$ eV, ${D}_{y}$=(-0.70 ifmmodepmelsetextpmfi{}0.05)ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}6}$ eV, and ${D}_{z}$=(8.10ifmmodepmelsetextpmfi{}0.05)ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}6}$ eV, where xensuremath{parallel}[11ifmmodebarelsetextasciimacronfi{}0], yensuremath{parallel}[110], and zensuremath{parallel}[001] are the axes diagonalizing both ${g}_{mathrm{ex}}$ and D tensors.The defect has the low ${C}_{1h}$ symmetry, i.e., lower than previously deduced from less accurate ODMR data. It is tentatively identified as a substitutional-interstitial pair ${mathrm{Cu}}_{mathrm{Ga}}$-${mathrm{Ga}}_{mathrm{i}}$, probably with an additional interstitial ${mathrm{Cu}}_{mathrm{i}}$ attached. The magnetic properties of the 1.911-eV BE triplet state are discussed in detail, and are found to be consistent with a strongly hole-attractive local defect potential, causing a nearly complete quenching of the angular momentum of the bound hole, so that its g tensor g${ensuremath{rightarrow}}_{h}$ is quite isotropic. The residual anisotropy of the g tensor is explained as due to spin-orbit interaction on the bound hole, while the D tensor is found to be mainly derived from the magnetic dipole-dipole interaction between the electron and the hole bound at the defect. The rather large linewidth for the ODMR resonances is tentatively explained as due to an unresolved hyperfine interaction involving the ${mathrm{Ga}}_{mathrm{i}}$, consistent with the evidence that the electron is also strongly localized to the defect." @default.
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- W2073161778 date "1988-02-15" @default.
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- W2073161778 title "Optically detected magnetic resonance studies of the 1.911-eV Cu-related complex in GaP" @default.
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- W2073161778 doi "https://doi.org/10.1103/physrevb.37.2558" @default.
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