Infrared spectroscopy of Mg-H local vibrational mode in GaN with polarized light

Clerjaud, B.; Côté, D.; Lebkiri, Ahmed; Naud, C.; Baranowski, J. M.; Pakuła, K.; Wasik, D.; Suski, T.

doi:10.1103/physrevb.61.8238

Cited by 50 publications

(51 citation statements)

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“…Recently, firstprinciples calculations [7,10] have shown that a novel "OA" (off-axis) configuration exhibits a 134º angle, in good agreement with Ref. [9]. Although the OA configuration is higher in energy than AB at T = 0, it is stabilized at high temperatures due to an increase in the entropy [10].…”

Section: Introductionsupporting

confidence: 78%

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Vibrational Spectroscopy of GaN:Mg Under Pressure

et al. 2001

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The microscopic structure of Mg-H complexes in GaN has been a subject of intense theoretical and experimental investigation. In order to probe the Mg-H structure, we have studied the effect of hydrostatic pressure on the local vibrational mode (LVM) frequency. At ambient pressure, the LVM frequency is 3125 cm -1 , which corresponds to a N-H stretching mode. In this study, Fourier-transform spectroscopy was performed on free-standing GaN:Mg,H samples in a diamond-anvil cell, with nitrogen as a pressure-transmitting fluid. The samples had been removed from their sapphire substrate by the laser-liftoff technique. The LVM frequency was measured, at liquid helium temperatures, for pressures ranging from 0 to 5 GPa. The pressure dependence of the frequency is nonlinear: first it decreases with pressure, then it increases. Comparison with first-principles calculations allows us to derive information about the microscopic structure of the Mg-H complex. The calculated stable configuration indeed gives rise to a frequency shift consistent with experiment. Based on the comparison between theory and experiment, we can exclude the bond-center configuration, which would result in a much larger pressure derivative than experimentally observed.

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Section: Introductionsupporting

confidence: 78%

“…Polarized IR absorption experiments by Clerjaud et al [9] have indicated that the N-H bond lies at a 130º angle to the c-axis. This angle is incompatible with the AB configuration, in which the N-H bond occurs at ~110 º to the c-axis.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopy of GaN:Mg Under Pressure

et al. 2001

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“…Therefore thermal annealing under nitrogen atmosphere at 800 ëC allows to dissociate all of the magnesium±hydrogen complexes. In our own investigations, hole concentrations up to 6 Â 10 17 cm ± ±3 have been obtained [26] using such annealing.…”

Section: Observation By Pacs Of Cadmium±hydrogen Complexes In Ganmentioning

confidence: 96%

“…One explanation for the absence of observation of a credible LVM associated with a carbon-hydrogen complex could have been that the H related bond of the complex is along the c-axis (type I complex) and therefore its observation would not have been possible with the``conventionalº set-ups in which the wave vector of the light is along the c-axis. Experiments in which the wave vector of the light is not along the c-axis have been recently performed [26] and did not succeed either in evidencing a hydrogen complex with carbon. Therefore, the existence of carbon-hydrogen complexes in GaN is still an open question.…”

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confidence: 98%

“…It has to be pointed out that for detecting the stretching LVMs related with type I complexes, one has to use a light beam whose wave vector is not along the c-axis. Such an experiment has been performed with polarised light [26]. It comes out that, in as-grown layers, all of the complexes are of type II, i. e. that their N±H bonds are along the Mg±N axes not along the c-axis.…”

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confidence: 99%

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