scholarly journals Low-Temperature DC Conductivity of LiNbO3Single Crystals

2012 ◽  
Vol 226 (5-6) ◽  
pp. 431-437 ◽  
Author(s):  
Benjamin Ruprecht ◽  
Johanna Rahn ◽  
Harald Schmidt ◽  
Paul Heitjans
2002 ◽  
Vol 12 (9) ◽  
pp. 313-314
Author(s):  
A. Akrap ◽  
D. Staresinic ◽  
K. Biljakovic ◽  
P. Lunkenheimer ◽  
A. Loidl

Low frequency dielectric response of charge density wave systems K0.3MoO3 and o-TaS3 shows hysteresis on temperature cycling. The closing of the hysteresis at low temperature coincides in both systems with the closing of the hysteresis in DC conductivity and corresponds to the temperature of the glass transition observed in dielectric response of these two systems. AC conducitivity is higher on heating, while DC conductivity is lower, i.e. two loops have opposite directions. Higher AC conducitivity (or dielectric response) is a consequence of more corrugated CDW phase on heating.


2006 ◽  
Vol 21 (25) ◽  
pp. 5007-5042 ◽  
Author(s):  
B. GEYER ◽  
G. L. KLIMCHITSKAYA ◽  
V. M. MOSTEPANENKO

We review recent results obtained in the physics of the thermal Casimir force acting between two dielectrics, dielectric and metal, and between metal and semiconductor. The detailed derivation for the low-temperature behavior of the Casimir free energy, pressure and entropy in the configuration of two real dielectric plates is presented. For dielectrics with finite static dielectric permittivity it is shown that the Nernst heat theorem is satisfied. Hence, the Lifshitz theory of the van der Waals and Casimir forces is demonstrated to be consistent with thermodynamics. The nonzero dc conductivity of dielectric plates is proved to lead to a violation of the Nernst heat theorem and, thus, is not related to the phenomenon of dispersion forces. The low-temperature asymptotics of the Casimir free energy, pressure and entropy are derived also in the configuration of one metal and one dielectric plate. The results are shown to be consistent with thermodynamics if the dielectric plate possesses a finite static dielectric permittivity. If the dc conductivity of a dielectric plate is taken into account this results in the violation of the Nernst heat theorem. We discuss both the experimental and theoretical results related to the Casimir interaction between metal and semiconductor with different charge carrier density. Discussions in the literature on the possible influence of spatial dispersion on the thermal Casimir force are analyzed. In conclusion, the conventional Lifshitz theory taking into account only the frequency dispersion remains the reliable foundation for the interpretation of all present experiments.


1995 ◽  
Vol 183 (1-2) ◽  
pp. 122-125 ◽  
Author(s):  
Hidetsugu Mori ◽  
Kouichi Gotoh ◽  
Hironobu Sakata

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Ivan A. Svito ◽  
Alexander K. Fedotov ◽  
Anis Saad ◽  
Momir Milosavljević ◽  
Julia A. Fedotova ◽  
...  

This presented work investigates the structure and temperature relationship/dependence of the DC conductivityσ(T)in the (Fe0.45Co0.45Zr0.10)x(Al2O3)1−xnanocomposites deposited in Ar atmosphere with composition (30<x<100 at.%) and temperature (2<T<300 K). It is shown that VRHσ(T)displayed crossover from Mott-like to Shklovskii-Efros regimes which occurred at temperatures of 100–120 K. It is also noted that the observed shift of the percolation threshold to higher concentrations of metallic fraction can be attributed to the disordering of the metallic nanoparticles due to the incorporation of the residual oxygen in the vacuum chamber during the deposition procedure.


2020 ◽  
Vol 35 (03) ◽  
pp. 2040010 ◽  
Author(s):  
C. C. Korikov ◽  
V. M. Mostepanenko

We find the low-temperature behavior of the Casimir-Polder free energy for a polarizable and magnetizable atom interacting with a plate made of ferromagnetic dielectric material. It is shown that the corresponding Casimir-Polder entropy goes to zero with vanishing temperature, i.e., the Nernst heat theorem is satisfied, if the dc conductivity of the plate material is disregarded in calculations. If the dc conductivity is taken into account, the Nernst theorem is violated. These results are discussed in light of recent experiments.


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