Electron paramagnetic resonance of boron-implanted natural diamonds and epitaxial diamond films

Erchak, D.P.; Efimov, V. G.; Azarko, I.I.; Denisenko, Andrej; Penina, N.M.; Stelmakh, V. F.; Varichenko, V.S.; Зайцев, А.М.; Melnikov, Alexander; Ulyashin, A.; Shlopak, N. V.; Bouilov, L.L.; Varnin, V. P.; Botev, A.A.; Соколина, Г. А.; Teremetskaya, I. G.

doi:10.1016/0925-9635(93)90163-v

Cited by 5 publications

(6 citation statements)

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“…It should be noted that this dependence differs in principle from the known modulation frequency dependencies of common unsaturated magnetic systems obeying well known unmodified Bloch equations for which the f m -dependence coincides with the lower frequency filter characteristics [16]. Likewise the character of the observed f m -dependence resembles that for PCs of quasi-one-dimensional tracklike modified structures (nanotubes) produced in diamond single crystals and diamond films upon ion implantation [3][4][5][6][7].…”

Section: Resultsmentioning

confidence: 81%

“…The dependence is linear for both high and low modulation frequencies f m , figure 3(b), and is identical for all individual line groups since the shapes of superposition remain without visible change with the changes of the microwave power. Studies of the interaction dynamics of the microwave field with the PC C-M2 were performed in a manner analogous to that reported by Ertchak et al [4][5][6][7].…”

Section: Resultsmentioning

confidence: 99%

“…The results of kinetic and dynamic studies presented in figures 3 and 4(a) can be explained by assuming that the PC C-M2 are mobile quasi-particles. Recently, a mechanism was proposed by Ertchak et al [3][4][5][6][7] allowing us to explain the observed increase of paramagnetic absorption for higher modulation frequencies by simultaneous unsaturated kinetics. The main idea is as follows.…”

Section: Discussionmentioning

confidence: 99%

“…The mobile quasi-particles in ion-modified diamond single crystals and diamond films are suggested to be topological solitons [3][4][5][6][7] similar to those observed in trans-polyacetylene [13], which, as argued in [4], present an individual class in the soliton family and can be considered Su-Schrieffer-Heeger solitons (SSH solitons). Similar absorption dynamics like those presented in figure 4(a) together with unsaturating H 1 -dependence of the resonance absorption intensity on the microwave magnetic field were observed both for PC C-M2 in the samples studied and for moving quasiparticles formed in ion-modified diamond single crystals and diamond films [3][4][5][6][7]. Consequently we can suggest that the PC C-M2 are also solitons.…”

Section: Discussionmentioning

confidence: 99%

“…However, in carbynes the possible spectra of the quasi-particles and elementary excitations are expected to be richer in a number of possible kinds in comparison with the quasi-particle family predicted theoretically in [2]. Indeed, recently a new type of elementary excitation, namely spin waves, has been found in related quasi-1D-carbon systems [3][4][5] formed as a result of ion-beam modification of diamond films and single crystals and presenting presumably a superlattice of quasi-1D spatially ordered nanotubes in the 3D diamond matrix [3][4][5][6][7]. Furthermore, according to Chugreev and Misurkin [8] the total energy minimum of the carbon chain can be realized as the result of the alternation in both the distributions of bond lengths and the spin or charge density.…”

Section: Introductionmentioning

confidence: 99%

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Electron spin resonance and microwave photoconductivity in carbynoid films

Ertchak

Kudryavtsev

Гусева

et al. 1999

J. Phys.: Condens. Matter

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First ESR studies are reported on oriented carbynoid samples prepared by chemical dehydrofluorination of poly(vinylidene fluoride) films. Two types of paramagnetic centres (PC), denoted as C-M1 and C-M2, and an anisotropic broad line were detected. The spectra of the PC C-M1 are isotropic with a g-value of . The absorption by given PC is well saturated at room temperature and the PC C-M1 can be attributed either to free radical states or pinned quasi-particles similar to topological Su-Schrieffer-Heeger solitons. The ESR and microwave photoconductivity results obtained confirm the quasi-1D nature of the carbon chains, being the structural elements of the samples studied, and agree with the assumption that the ground state of carbon chains is a state with a spin density wave (SDW) realized at room temperature. The ESR spectrum of the PC C-M2 consisting of a series of unsaturated lines is anisotropic both in relation to the static magnetic field and in relation to the magnetic component of the microwave field. The study of the interaction dynamics of the microwave field with PC C-M2, the absorption dependence with increase of the microwave field and the temperature dependence allow us to attribute the PC C-M2 to mobile quasi-particles, being domain walls in the alternated spin density distribution, tentatively solitons in the SDW. It has been found that spin waves associated with the PC C-M2 can be observed in samples treated thermally at for 2 hours (the samples contained fluorine with atomic ratio F/C = 3/7 and oxygen at 20 at.%). It has been proven that the spin waves' excitation and the formation of quasi-particles like solitons can represent the same process.

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