scholarly journals Identification of structural motifs as tunneling two-level systems in amorphous alumina at low temperatures

2014 ◽  
Vol 90 (22) ◽  
Author(s):  
Alejandro Pérez Paz ◽  
Irina V. Lebedeva ◽  
Ilya V. Tokatly ◽  
Angel Rubio
Keyword(s):  
Low Temperatures ◽  
Structural Motifs ◽  
Two Level Systems ◽  
Amorphous Alumina

scholarly journals Дефектонный вклад в высокотемпературную сверхпроводимость гидридов

2019 ◽  
Vol 61 (7) ◽  
pp. 1236
Author(s):  
А.И. Морозов
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Hydrogen Atom ◽  
Crystal Lattice ◽  
Low Temperatures ◽  
Hydrogen Atoms ◽  
Superconducting Phases ◽  
Exponential Increase ◽  
Two Level Systems ◽  
Lattice Compression

The high pressure of the order of hundreds of gigapascals required to obtain the high-temperature superconducting phases of a number of hydrides causes the crystal lattice compression, which in turn leads to an exponential increase in the probability of a hydrogen atom tunneling between equivalent interstices. At low temperatures, vacancies in the filled under stoichiometry hydrogen sublattice and hydrogen atoms in the completely free under stoichiometry interstice sublattice are quantum defect - defectons. The estimate of the defecton contribution into the superconductivity of hydrides has been obtained and has been shown that it can be substantial either in the case of free defectons, or in the case of defectons, clusterized with the formation of two-level systems.

The two-level systems role in nuclear relaxation at low temperatures

1991 ◽  
Vol 168 (3) ◽  
pp. 205-210 ◽  
Author(s):  
L.L. Buishvili ◽  
L.Zh. Zakharov ◽  
A.I. Tugushi ◽  
N.P. Fokina
Keyword(s):  
Low Temperatures ◽  
Nuclear Relaxation ◽  
Two Level Systems

scholarly journals INTRINSIC PHASE-DECOHERENCE OF ELECTRONS BY TWO-LEVEL SYSTEMS

2002 ◽  
Vol 16 (14) ◽  
pp. 511-517 ◽  
Author(s):  
VIPIN SRIVASTAVA ◽  
RAISHMA KRISHNAN
Keyword(s):  
Phase Shift ◽  
Inelastic Scattering ◽  
Low Temperatures ◽  
Fundamental Problem ◽  
Scattering Rate ◽  
Phase Saturation ◽  
Long Range Interactions ◽  
Two Level Systems ◽  
Phase Decoherence ◽  
Dynamic Components

The fundamental problem of the phase saturation of electrons in a disordered mesoscopic system at very low temperatures is addressed. The disorder in the medium has both static and dynamic components, the latter being in the form of two-level systems (TLSs) which become just about the only source of inelastic scattering in the limit T → 0. We propose that besides the inelastic nature of scattering from the TLSs, the phase shift of the electrons is also affected by the nature of tunneling in the TLSs. The tunneling becomes incoherent as T decreases due to increasing long-range interactions among the TLSs which affects the phase coherence of electrons scattering from them. The competition between this effect, which increases as ~ T-1, and that of the scattering rate [Formula: see text] behaving as ~ T apparently govern the phase shift of the electrons.

Dielectric response of two level systems to strain fields at low temperatures

1996 ◽  
Vol 46 (S4) ◽  
pp. 2265-2266 ◽  
Author(s):  
Douglas Natelson ◽  
Sven Rogge ◽  
D. D. Osheroff
Keyword(s):  
Low Temperatures ◽  
Dielectric Response ◽  
Strain Fields ◽  
Two Level Systems

Sarcosine and betaine crystals upon cooling: structural motifs unstable at high pressure become stable at low temperatures

2015 ◽  
Vol 17 (5) ◽  
pp. 3534-3543 ◽  
Author(s):  
E. A. Kapustin ◽  
V. S. Minkov ◽  
E. V. Boldyreva
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
Low Temperatures ◽  
Structural Motifs

Behavior of crystalline sarcosine and betaine upon cooling down to 5 K was studied and compared to that upon increasing of hydrostatic pressure.

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