Correlation functions in Heisenberg magnetic chains: Quantum effects at low temperatures

1975 ◽  
Vol 12 (7) ◽  
pp. 2794-2802 ◽  
Author(s):  
H. J. Mikeska
Keyword(s):  
Correlation Functions ◽  
Low Temperatures ◽  
Quantum Effects ◽  
Magnetic Chains

Dielectric Loss in Li- and Na-Swept α-Quartz and the Effect of Irradiation

1983 ◽  
Vol 24 ◽  
Author(s):  
J. Toulouse ◽  
A.S. Nowick
Keyword(s):  
Dielectric Loss ◽  
Low Temperature ◽  
Low Temperatures ◽  
Quantum Effects ◽  
Frequency Stability ◽  
Distorted Tetrahedron ◽  
High Quality ◽  
Quartz Crystals ◽  
Alkali Ions ◽  
Synthetic Crystals

ABSTRACTAlkali ions, which compensate for substitional Al3+, play an important role in the frequency stability of α-quartz crystals. In this work, low temperature dielectricloss measurements (between 2.9 and 300 K) are carried out on crystals that have been “swept” so as to introduce either Li+ or Na+. High quality synthetic crystals as well as natural crystals are employed. The well known loss peaks due to Al-Na pairs are further explored and similar peaks due to Al-Li are sought after but not found. It is concluded that the Al-Li pair is oriented along the C2 -axis of the A104 distorted tetrahedron. After irradiation, large peaks are observed at very low temperatures both in Li+- and Na+-containing crystals. These peaks, which are distorted below ∼6 K due to the onset of quantum effects, may originate in alkali centers produced when alkali ions are liberated by the irradiation.

Quantum Effects at a Proton Relaxation at Low Temperatures

2016 ◽  
Vol 59 (7) ◽  
pp. 994-1001 ◽  
Author(s):  
V. A. Kalytka ◽  
M. V. Korovkin
Keyword(s):  
Low Temperatures ◽  
Quantum Effects ◽  
Proton Relaxation

scholarly journals Piezoelectric rotator for studying quantum effects in semiconductor nanostructures at high magnetic fields and low temperatures

2010 ◽  
Vol 81 (11) ◽  
pp. 113905 ◽  
Author(s):  
L. A. Yeoh ◽  
A. Srinivasan ◽  
T. P. Martin ◽  
O. Klochan ◽  
A. P. Micolich ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Low Temperatures ◽  
Quantum Effects ◽  
Semiconductor Nanostructures ◽  
High Magnetic Fields

Anomalies in the temperature dependence of the yield stress of metals at low temperatures

1983 ◽  
Vol 61 (11) ◽  
pp. 1528-1530 ◽  
Author(s):  
S. M. Raza
Keyword(s):  
Low Temperature ◽  
Temperature Dependence ◽  
Yield Stress ◽  
Low Temperatures ◽  
Structural Changes ◽  
Zero Point ◽  
Quantum Effects ◽  
Enhancement Effect ◽  
Polycrystalline Nickel ◽  
Creep Equation

Yield stress "anomalies" have been studied in polycrystalline nickel at low temperatures. Both quantum effects and structural changes below 0.1–0.2 of the Debye temperature contribute to low-temperature anomalies in the temperature dependence of the yield stress. The anomalies appear to be basically a consequence of the effect of zero-point vibrations on the rates of transition in the localized process of activation. An attempt is made to explain the anomalies by introducing a "strain-enhancement" effect, i.e., f(T), semiempirically in the logrithmic creep equation [Formula: see text] where Teff = T0 + AT2 (T0 and A are constants), which allows for quantum effects below a certain temperature.

Transient properties of a bistable kinetic model with quantum corrections

Open Physics ◽  
2006 ◽  
Vol 4 (2) ◽  
Author(s):  
Bao-quan Ai ◽  
Hua Zheng ◽  
Hui-zhang Xie ◽  
Liang-gang Liu
Keyword(s):  
Low Temperatures ◽  
Brownian Particle ◽  
First Passage Time ◽  
Quantum Effects ◽  
Passage Time ◽  
Bistable System ◽  
Original Position ◽  
Quantum Corrections ◽  
Mean First Passage Time ◽  
The Mean

AbstractThe transient properties of a Brownian particle moving in a bistable system with quantum corrections are investigated. The Quantum Smoluchowski Equation (QSE) is fully valid for high temperatures; for low temperatures it is valid only in a restricted domain of the state space. The quantum effects in a bistable system stand out for low temperatures. Explicit expressions of the mean first-passage time (MFPT) are obtained by using a steepest-descent approximation. The quantum effects are against the particle moving towards the destination from its original position.

Quantum effects and Haldane gap in magnetic chains with alternating anisotropy axes

2011 ◽  
Vol 182 (9) ◽  
pp. 2013-2016 ◽  
Author(s):  
A. Barasiński ◽  
A. Drzewiński ◽  
G. Kamieniarz
Keyword(s):  
Quantum Effects ◽  
Haldane Gap ◽  
Magnetic Chains

Spin-correlation functions in sine-Gordon magnetic chains

1980 ◽  
Vol 22 (11) ◽  
pp. 5308-5316 ◽  
Author(s):  
Daniel Hone ◽  
K. M. Leung
Keyword(s):  
Correlation Functions ◽  
Spin Correlation ◽  
Magnetic Chains
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