Formation of strained superlattices with a macroscopic period via spinodal decomposition of III–V semiconductor alloys

Ipatova, I. P.; Shchukin, V. A.; Malyshkin, Vladislav Gennadievich; Maslov, A. Yu.; Anastassakis, E.

doi:10.1016/0038-1098(91)90801-2

Cited by 19 publications

(4 citation statements)

References 28 publications

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“…The stability of epitaxial A 1−x B x alloy films and strained A p B q superlattices depends on (i) the energies of coherently strained constituents A and B, and (ii) the formation energy of A 1−x B x or A p B q itself. Regarding (i), previous theoretical studies 18,[43][44][45][46][47][48][49][50][51][52][53][54][55][56] have described these energies using harmonic models, but we are interested here in large strains for which the harmonic theory could break down. Thus, we develop a generalization of previous methods to treat the anharmonic epitaxial strain energies of the con-stituents.…”

Section: Introductionmentioning

confidence: 99%

Effects of anharmonic strain on the phase stability of epitaxial films and superlattices: Applications to noble metals

1998

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Epitaxial strain energies of epitaxial films and bulk superlattices are studied via first-principles total energy calculations using the local-density approximation. Anharmonic effects due to large lattice mismatch, beyond the reach of the harmonic elasticity theory, are found to be very important in Cu/Au (lattice mismatch 12%), Cu/Ag (12%) and Ni/Au (15%). We find that 001 is the elastically soft direction for biaxial expansion of Cu and Ni, but it is 201 for large biaxial compression of Cu, Ag, and Au. The stability of superlattices is discussed in terms of the coherency strain and interfacial energies. We find that in phase-separating systems such as Cu-Ag the superlattice formation energies decrease with superlattice period, and the interfacial energy is positive. Superlattices are formed easiest on (001) and hardest on (111) substrates. For ordering systems, such as Cu-Au and Ag-Au, the formation energy of superlattices increases with period, and interfacial energies are negative. These superlattices are formed easiest on (001) or (110) and hardest on (111) substrates. For NiAu we find a hybrid behavior: superlattices along 111 and 001 behave like in phase-separating systems, while for 110 they behave like in ordering systems. Finally, recent experimental results on epitaxial stabilization of disordered Ni-Au and Cu-Ag alloys, immiscible in the bulk form, are explained in terms of destabilization of the phase separated state due to lattice mismatch between the substrate and constituents.

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Section: Introductionmentioning

confidence: 99%

Effects of anharmonic strain on the phase stability of epitaxial films and superlattices: Applications to noble metals

1998

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“…It occurs when the enthalpy of binary compounds is positive and the alternating alloy composition is energetically favorable. The effect was observed previously in bulk of liquid and solid solutions and later was expanded on epitaxial films [3]. Typical period of composition-modulation in epitaxial films is of the order of a film thickness, i.e.…”

Section: Introductionmentioning

confidence: 54%

Instability of homogeneous composition of highly strained quantum wells in heterostructures GaAs/InxGa1-xAs/GaAs

Klimovskaya¹

2002

Semicond. Phys. Quantum Electron. Optoelectron.

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“…Great opportunities to produce different types of self-ordering nanostructures such as quantum wires and crystallography-oriented quantum dot systems are provided by means of a method of molecular beam epitaxy [180], as well as ion implantation and non-equilibrium impurity diffusion methods [181]. As the method of atomic layer deposition (ALD) [182], they are widely applied in modern technology of semiconductors and nanoelectronics in the synthesis of other functional materials in planar technology [183][184][185].…”

Section: Fig 16 the Distribution Of Stationary (A) And Flash (B) Mamentioning

confidence: 99%

High-temperature superconductivity: From macro- to nanoscale structures

Коваленко¹

2016

Nanosystems: Phys. Chem. Math.

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The analysis of achievements, problems and prospects of high-temperature superconductivity (HTSC) in the macro-and nanostructured materials has been given. The main experimental results and theoretical models describing the physical mechanisms of the superconductivity appearance at phenomenological and microscopic levels, including change in the energy spectrum of atoms in these materials with the advent of the 'superconducting' gap at temperatures below the critical transition, as well as the above-critical temperature 'pseudo-gap' have been analyzed.Although the origin of the pseudo-gap is not completely understood, it can be considered as an independent phase transition in the substance prior to the transition to the zero resistance state and insusceptibility (or insensitivity) to external magnetic field in high-temperature superconductors. Features of multi-gap and gapless superconducting materials as well as their ability to further increase the temperature of supercritical transition are discussed. Large resources to create the necessary electron and phonon spectra in the process of high-temperature superconductivity formation are associated with the use of nanoscale structures and nanoparticles of conductors and dielectrics. Electrical conductive contacts between nanoparticles and tunnel chains of nanoclusters, where delocalized electron spectra form similar energy shells to the atomic or nuclear shells, play a significant part here. It is required to further investigate the occurrence of high-temperature superconductivity at the level of interphase layers (non-autonomous phases) in nanostructures containing a large fraction of the substance in this condition. It is essential to develop adequate methods for synthesis of nanoparticles of variable size, structure and morphology, as well as techniques for their consolidation that would ensure the preservation of superconductivity of individual nanoparticles, their chemical, thermal, magnetic and current stability in the dissipative processes with functional and fluctuation effects.

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Formation of strained superlattices with a macroscopic period via spinodal decomposition of III–V semiconductor alloys

Cited by 19 publications

References 28 publications

Effects of anharmonic strain on the phase stability of epitaxial films and superlattices: Applications to noble metals

Effects of anharmonic strain on the phase stability of epitaxial films and superlattices: Applications to noble metals

Instability of homogeneous composition of highly strained quantum wells in heterostructures GaAs/InxGa1-xAs/GaAs

High-temperature superconductivity: From macro- to nanoscale structures

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