The Electrical Resistivity of Exploding Ni-Wires in Fast RCL-Circuits

1977 ◽  
Vol 32 (2) ◽  
pp. 147-151 ◽  
Author(s):  
U. Seydel ◽  
W. Fucke ◽  
B. Möller
Keyword(s):  
Electrical Resistivity ◽  
Melting Point ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Energy Dependence ◽  
Curie Point ◽  
Boiling Point ◽  
Discharge Circuit ◽  
Time Resolved ◽  
Good Agreement

The electrical resistivity of Ni is derived from time-resolved measurements of current and voltage of exploding Ni-wires, which are part of a fast RCL-discharge circuit. The values of the resistivity at the Curie-point and at the melting point are in good agreement with stationary measurements. Deviations are discussed. Furthermore, the energy dependence of the resistivity of liquid Ni up to the boiling point (at normal conditions) is determined and compared with the temperature dependence assuming a constant specific heat

ROLE OF FRUSTRATION IN MAGNETISM AND THERMODYNAMIC PROPERTIES OF YMn2 AND β-Mn

1993 ◽  
Vol 07 (01n03) ◽  
pp. 1008-1012 ◽  
Author(s):  
M. SHIGA ◽  
K. YOSHIMOTO ◽  
H. NAKAMURA ◽  
H. WADA
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Ground State ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Liquid

The temperature dependence of the magnetic susceptibility, the specific heat and the electrical resistivity of Y(Sc) (Mn1−xAlx)2 and β-Mn1−xAlx systems has been measured. It is shown that the ground state for x=0 is not a simple Pauli paramagnet but may be regarded as a quantum spin liquid. The substitution of Al for Mn results in the spin glass freezing. The role of frustration is discussed for understanding these phenomena.

Specific Heat of Liquid Iron from the Melting Point to the Boiling Point

2018 ◽  
Vol 56 (6) ◽  
pp. 933-935 ◽  
Author(s):  
A. I. Savvatimskiy ◽  
S. V. Onufriev
Keyword(s):  
Melting Point ◽  
Specific Heat ◽  
Liquid Iron ◽  
Boiling Point

POSSIBLE TWO ELECTRONIC STATES OF Mn ATOMS IN BCC Cr-Mn ALLOYS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 891-894
Author(s):  
M. SHIGA ◽  
H. WADA
Keyword(s):  
Electrical Resistivity ◽  
Thermal Expansion ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Low Temperatures ◽  
Electronic States ◽  
Local Environment ◽  
Negative Temperature ◽  
Environment Effect ◽  
Proposed Model

The thermal expansion, the electrical resistivity and the specific heat of Mn-rich bcc Cr-Mn alloys have been measured. Distinct negative temperature dependence was observed in the thermal expansion and the resistivity at low temperatures. These anomalies are successfully explained on the basis of the two electronic state model by taking account of a local environment effect. An enhanced specific heat at low temperatures is consistently understood in terms of the proposed model.

"Sub-Microsecond Pulse Heating Measurements of High Temperature Electrical Resistivity of the 3d-Transition Metals Fe, Co, and Ni"

1977 ◽  
Vol 32 (9) ◽  
pp. 994-1002 ◽  
Author(s):  
U. Seydel ◽  
W. Fucke
Keyword(s):  
Electrical Resistivity ◽  
Boiling Point ◽  
Surrounding Medium ◽  
Time Interval ◽  
Normal Boiling Point ◽  
Time Resolved ◽  
The Wire ◽  
Latent Heats ◽  
Estimated Error ◽  
Measured Resistivity

AbstractThe exploding wire technique is suitable for the determination of the electrical resistivity of metals in a wide temperature range provided that the heating of the wire material in the liquid phase occurs fast enough to avoid changes in the wire geometry due to surface tension. It is also an appropriate method for measuring latent heats of fusion especially for refractory metals. The electrical resistivity ρ and the enthalpy H are derived from time-resolved measurements of cur­ rent and voltage of exploding wires, which are part of a fast RCL-discharge circuit. The time interval for heating the wire from room temperature to the normal boiling point is typically 1 μsec. Because of the short times involved interactions with the surrounding medium are negligible. The time resolution of the system is better than 8 nsec and the estimated error of measured resistivity and enthalpy above temperatures of 1000 K is less than 4%. For Fe, Co, and Ni the ρ (H) -dependence up to the normal boiling point and the therefrom derived ρ (T) -dependence are reported and compared with steady-state experiments.

Two-Gap Superconductivity in MgB2

2003 ◽  
Vol 17 (13) ◽  
pp. 2589-2598
Author(s):  
Angsula Ghosh
Keyword(s):  
Critical Temperature ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Order Parameter ◽  
Tight Binding ◽  
Tight Binding Model ◽  
S Wave ◽  
Binding Model ◽  
Half Filling ◽  
Good Agreement

We study the superconductivity in MgB2 using a tight binding model to investigate the doping dependence of the order parameter and the critical temperature. We consider both the anisotropic and the isotropic s-wave pairing to study the coexistence of the two gaps. A good agreement between the existing experiments and our theoretical curves is observed. The temperature dependence of order parameter, specific heat and penetration depth at half filling are also demonstrated and are found to be in accord with the available experimental predictions.

TEMPERATURE DEPENDENCE BEHAVIOR OF ELECTRICAL RESISTIVITY IN NOBLE METALS AT LOW TEMPERATURES

2014 ◽  
Vol 5 (3) ◽  
pp. 982-992 ◽  
Author(s):  
M AL-Jalali
Keyword(s):  
Experimental Data ◽  
Electrical Resistivity ◽  
Temperature Dependence ◽  
Concentration Dependence ◽  
Low Temperatures ◽  
Noble Metals ◽  
Phonon Scattering ◽  
Theoretical Models ◽  
Residual Resistivity ◽  
Electron Phonon Scattering

Resistivity temperature – dependence and residual resistivity concentration-dependence in pure noble metals(Cu, Ag, Au) have been studied at low temperatures. Dominations of electron – dislocation and impurity, electron-electron, and electron-phonon scattering were analyzed, contribution of these mechanisms to resistivity were discussed, taking into consideration existing theoretical models and available experimental data, where some new results and ideas were investigated.

A LOW-COST RESISTIVIMETER FOR USE IN PRACTICAL LECTURES OF APPLIED GEOPHYSICS

2016 ◽  
Vol 34 (1) ◽  
Author(s):  
Walter Sydney Dutra Folly ◽  
Aracy Sousa Senra
Keyword(s):  
Electrical Resistivity ◽  
Low Cost ◽  
Test Area ◽  
Vertical Electrical Sounding ◽  
Applied Geophysics ◽  
Resistivity Profile ◽  
Electrical Sounding ◽  
Good Agreement

ABSTRACT. We describe the construction and testing of a simple and efficient low-cost resistivimeter designed for use in practical classes in Applied Geophysics. The equipment was successfully tested in a vertical electrical sounding (VES) performed on sandy terrain within the campus of the Universidade Federal de Sergipe, Brazil. The VES results were in good agreement with the profiles obtained from two boreholes located approximately 500 m from the test area, clearly demonstrating the efficiency of the equipment and the adopted methodology.Keywords: vertical electrical sounding, electrical resistivity, resistivity profile. RESUMO. Neste artigo, descrevemos a construção e o teste de um resistivímetro de baixo custo, simples e eficiente, concebido para ser utilizado em aulas práticas de Geofísica Aplicada. O equipamento foi testado com a realização de uma sondagem elétrica vertical (SEV) em um terreno arenoso localizado no campus da Universidade Federal de Sergipe, Brasil. Os resultados obtidos nesta SEV apresentaram boa concordância com os perfis observados em dois poços de sondagem localizados a 500 m da área de teste, fato que comprovou a eficiência do equipamento e da metodologia adotada.Palavras-chave: sondagem elétrica vertical, resistividade elétrica, perfil de resistividade. 

Temperature dependence of time-resolved photoluminescence of bound excitons in CuInS2 crystals

2005 ◽  
Vol 480-481 ◽  
pp. 283-285 ◽  
Author(s):  
K. Wakita ◽  
K. Nishi ◽  
Y. Ohta ◽  
T. Onishi
Keyword(s):  
Temperature Dependence ◽  
Time Resolved ◽  
Time Resolved Photoluminescence
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