摘要:

Resistivity of (Co0.93Fe0.07)0.78Mo0.02B0.15Si0.05metallic glass has been measured from 10 to 900 K. Below room temperature (RT) it varies asT2and exhibits a very broad minimum at around 100 K. Above room temperature it varies linearly until a temperature where it crystallizes.

ISSN:0094-243X    

DOI:10.1063/1.44733

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Results on the temperature and magnetic field dependence of the electrical resistivity of (Cu0.36Ti0.64)1−xAlxat low temperatures are presented and discussed in terms of quantum corrections to the resistivity as a function of aluminum concentration.

ISSN:0094-243X    

DOI:10.1063/1.44734

出版商:AIP    

年代:1992

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.44735

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The temperature variation of D.C. electrical resistivity measured on the Y1−xPrxBa2Cu3Oysamples (x=0, 0.2, 0.4, and 0.5) show that Variable Range Hopping (VRH) is the dominant conduction mechanism in the semiconducting state of these samples below 250 K. However, we could not distinguish between the two and three dimensional (2D and 3D) VRH.

ISSN:0094-243X    

DOI:10.1063/1.44736

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

We have investigated through AC electrical conductivity and differential scanning calorimetry, the annealing behavior of a disordered (microcrystalline) form of Li2SO4obtained by quenching from its melting point, to 300 °C. Annealing causes structural relaxation of the microcrystalline phase leading to an optimization of Li+conduction path, resulting in a high Li+conductivity with low (0.18 eV) activation energy.

ISSN:0094-243X    

DOI:10.1063/1.44737

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Optical energy gap, electrical resistivity, glass and crystallization temperatures of amorphous Se1−xTexalloys have been measured. It is observed that atx=0.1 these properties show a discontinuous change.

ISSN:0094-243X    

DOI:10.1063/1.44694

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Effect of &ggr;‐irradiation from Co60of radiation doze 50 MRad on the dielectric and thermodynamical properties of cholesteryl myristate (ChM) and cholesteryl pelargonate (ChP) have been studied by an electric impedance analyzer and differential scanning calorimeter (DSC). The mesophase transition temperatures, the enthalpy and the entropy of the transitions are depressed, and transition curves become asymmetric and wide on &ggr;‐irradiation. From the depressions in crystal to mesophase transition temperatures of ChM and ChP, we have estimated the molar fraction of impurity like fragments produced due to &ggr;‐irradiation of 50 MRad doze to be about 10%. Dielectric study of planar oriented samples of these two esters in the frequency range of 1 kHz to 10 MHz shows that due to &ggr;‐irradiation dielectric loss (&egr;‘) is increased by 50 to 150% in different mesophases while dielectric constant (&egr;’) is almost unchanged.

ISSN:0094-243X    

DOI:10.1063/1.44695

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Nature of normal state excitations of cuprate superconductors ha been considered in terms of the situation which exist in these systems. Cooper pairing of these excitations has been treated by a ‘‘Belitz‐like’’ theory. It is found that a linearTcdegradation with disorder is possible in this model, and that the gap ratio decreases with increasing disorder as observed experimentally.

ISSN:0094-243X    

DOI:10.1063/1.44696

出版商:AIP    

年代:1992

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.44747

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The low‐temperature localized phonon modes are evaluated for some superconducting (SC) alloys containing Fe, from the ratio of mean square displacement (MSD) and mean square velocity (MSV) of the Fe‐atoms and are found to depend on changes in mass and force constant.

ISSN:0094-243X    

DOI:10.1063/1.44697

出版商:AIP    

年代:1992

数据来源: AIP