Isotopic shifts of the low-energy excitations of interstitial oxygen in germanium

Laßmann, Kurt; Linsenmaier, C; Maier, Frank; Zeller, Fabian; Häller, E. E.; Itoh, Kohei M.; Khirunenko, Lyudmila I.; Pajot, B.; Müssig, Hans Joachim

doi:10.1016/s0921-4526(98)01391-x

Cited by 7 publications

(15 citation statements)

References 10 publications

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“…In general, these results are in agreement with previous investigations. 42,32,34,37,43 In contrast with Si, these frequencies do not drop with increasing pressure and no mode around the Raman frequency occurs. The difference in behavior is probably due to the very different bond angle in the two materials.…”

Section: Simentioning

confidence: 95%

Oxygen and dioxygen centers in Si and Ge: Density-functional calculations

et al. 2000

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Ab initio density-functional calculations using Gaussian orbitals are carried out on large Si and Ge supercells containing oxygen defects. The formation energies, local vibrational modes, and diffusion or reorientation energies of O i , O 2i , VO, VOH, and VO 2 are investigated. The piezospectroscopic tensors for O i , VO, and VO 2 are also evaluated. The vibrational modes of O i in Si are consistent with the view that the defect has effective D 3d symmetry at low hydrostatic pressures but adopts a buckled structure for large pressures. The anomalous temperature dependence of the modes of O 2i is attributed to an increased buckling of Si-O-Si when the lattice contracts. The diffusion energy of the dimer is around 0.8 eV lower than that of O i in Si and 0.6 eV in Ge. The dimer is stable against VO or VO 2 formation and the latter defect has modes close to the reported 894-cm Ϫ1 band. The reorientation energies for O and H in VO and VOH defects are found to be a few tenths of an eV and are greater when the defect has trapped an electron.

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Section: Simentioning

confidence: 95%

Oxygen and dioxygen centers in Si and Ge: Density-functional calculations

et al. 2000

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“…The high-resolution spectrum of the S sample at LHeT shows the 3 mode of the three O isotopes ͑the natural proportions of 16 O, 17 O, and 18 O are approximately 100, 0.04, and 0.2, respectively͒ and two weak and rather broad bands at 780 and 801 cm Ϫ1 . The composite spectrum of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…It could be interesting however to compare the situation in germanium with that in silicon, where a resonance effect broadens the 3 ( 17 O) structure. 10 We report here results obtained from good-quality 3 ( 17 O) and 3 ( 18 O) spectra in germanium with 17 O and 18 O natural abundances. The 18 O spectra are compared with those in a sample enriched with 18 O.…”

Section: Introductionmentioning

confidence: 95%

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O isotope effects and vibration-rotation lines of interstitial oxygen in germanium

et al. 2000

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The infrared absorption of interstitial 17 O and 18 O has been measured at high resolution in natural germanium in a multireflection geometry. The asymmetric mode of 18 O is observed to be broadened by interaction with the phonon background while that of 17 O is unaffected. The broadening is confirmed by results on an 18 O-enriched sample. All the O and Ge isotope shifts can be fitted or predicted rather accurately by a twoparameter semiempirical model using values determined by Pajot and Clauws in 1988. In the multireflection geometry, new lines of low intensity are also observed and they are ascribed to transitions with change of the rotational state of 16 O between the ground and excited vibrational states. Energies of the two-dimensional 16 O rotator are derived from these measurements, with a Ge isotope effect much smaller than the one deduced from phonon spectroscopy.

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“…1. It is based on an already existing 3 He apparatus [17][18][19] which we have equipped with a new insert for the microwave experiment, as depicted in Fig. 1(a).…”

Section: He Corbino Spectrometermentioning

confidence: 99%

Broadband microwave spectroscopy in Corbino geometry at 3He temperatures

Steinberg

Scheffler

Dressel

2012

Review of Scientific Instruments

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A broadband microwave spectrometer has been constructed to determine the complex conductivity of thin metal films at frequencies from 45 MHz to 20 GHz working in the temperature range from 0.45 K to 2 K (in a (3)He cryostat). The setup follows the Corbino approach: a vector network analyzer measures the complex reflection coefficient of a microwave signal hitting the sample as termination of a coaxial transmission line. As the calibration of the setup limits the achievable resolution, we discuss the sources of error hampering different types of calibration. Test measurements of the complex conductivity of a heavy-fermion material demonstrate the applicability of the calibration procedures.

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Isotopic shifts of the low-energy excitations of interstitial oxygen in germanium

Cited by 7 publications

References 10 publications

Oxygen and dioxygen centers in Si and Ge: Density-functional calculations

Oxygen and dioxygen centers in Si and Ge: Density-functional calculations

O isotope effects and vibration-rotation lines of interstitial oxygen in germanium

Broadband microwave spectroscopy in Corbino geometry at 3He temperatures

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