Knight shift, magnetic susceptibility and electrical resistivity of pure gallium and gallium-indium eutectic alloy in the normal and the super-cooled liquid state

Magnetic susceptibility and electrical resistivity have been measured on UCuGa, UCu1+xSn1−x, (x=0 and 0.1), and UPdAl. The first two compounds, crystallizing in the hexagonal CaIn2-type structure, show at low temperatures an antiferromagnetic ordering probably with complex structures. UPdAl, which adopts the orthorhombic TiNiSi-type structure, was found to be a weakly temperature-dependent paramagnet down to 4.2 K.

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Synthesis, Structure and Magnetism of ErCoIn5

MRS Proceedings ◽

10.1557/proc-848-ff3.7 ◽

2004 ◽

Vol 848 ◽

Author(s):

Evan Lyle Thomas ◽

Erin E. Erickson ◽

Monica Moldovan ◽

David P. Young ◽

Julia Y. Chan

Keyword(s):

Magnetic Properties ◽

Electrical Resistivity ◽

Magnetic Susceptibility ◽

Single Crystal ◽

Experimental Results ◽

Flux Growth ◽

X Ray Diffraction ◽

Metallic Behavior ◽

X Ray ◽

Growth Method

AbstractA new member of the LnMIn5 family, ErCoIn5, has been synthesized by a flux-growth method. The structure of ErCoIn5 was determined by single crystal X-ray diffraction. It crystallizes in the tetragonal space group P4/mmm, Z = 1, with lattice parameters a = 4.5400(4) and c = 7.3970(7) Å, and V = 152.46(2) Å3. Electrical resistivity data show metallic behavior. Magnetic susceptibility measurements show this compound to be antiferromagnetic with TN = 5.1 K. We compare these experimental results with those of LaCoIn5 in an effort to better understand the effect of the structural trends observed on the transport and magnetic properties.

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Geology and geophysics at the archeological park of Vulci (central Italy)

Annals of Geophysics ◽

10.4401/ag-6361 ◽

2014 ◽

Vol 57 (1) ◽

Author(s):

Marco Marchetti ◽

Vincenzo Sapia ◽

Adriano Garello ◽

Donatella De Rita ◽

Alessandra Venuti

Keyword(s):

Electrical Resistivity ◽

Magnetic Susceptibility ◽

Cultural Heritage ◽

Central Italy ◽

Geophysical Methods ◽

Archaeological Sites ◽

Local Authorities ◽

Resistivity Tomography ◽

Geological Information ◽

Geological Map

<p>The Vulci archeological site was object of interest by the Soprintendenza ai beni culturali dell’Etruria meridionale (Italian government department responsible for southern Etruria’s cultural heritage) since the beginning of the 20th century. In 2001, the Ministero dei Beni Culturali (Italian ministry of cultural heritage) along with the local authorities, opened a natural-archeological park. In this area, it lies most of the ancient Etruscan city of Velch (today known by its Latin name, Vulci) including the Osteria Necropolis that is the object of this study. Recently, new archaeological excavations were made and the local authorities needed major geological information about the volcanic lithotypes where the Etruscans used to build their necropolis. The aim of this study is to define the geological and geophysical characteristics of the rock lithotypes present in the Vulci park. For this purpose, a geological map of the area (1:10000) has been realized. Moreover, two different geophysical methods were applied: measurements of magnetic susceptibility and electrical resistivity tomography. Magnetic susceptibility analyses clearly identify magnetic contrasts between different lithotypes; the characteristics of the pyroclastic flow that originated the Sorano unit 2 and its vertical facies variations are well recorded by this parameter that along with lithostratigraphic observations provides information about the depositional conditions. Two electrical resistivity tomographies were performed, which show the Sorano unit 2 thickness to be of c. 7 m with resistivity values ranging from 200 to 400 Ω·m. This kind of multidisciplinary approach resulted to be suitable to study this type of archaeological sites, revealing that areas characterized by a relevant thickness and wide areal extension of volcanic lithotypes can be a potential site where Etruscans might have excavated their necropolis.</p>

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Improvement of superconducting parameters of Bi1.6Pb0.4Sr 2Ca 2Cu 3O10+ δ added with Au nanoparticles

Iraqi Journal of Physics (IJP) ◽

10.30723/ijp.v16i38.95 ◽

2018 ◽

Vol 16 (38) ◽

Author(s):

Amal K. Jassim

Keyword(s):

Electrical Resistivity ◽

Magnetic Susceptibility ◽

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Au Nanoparticles ◽

Ac Magnetic Susceptibility ◽

Critical Temperatures ◽

Magnetization Measurements ◽

Dc Electrical Resistivity

Samples of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor were prepared by solid-state reaction method to study the effects of gold nanoparticles addition to the superconducting system, Nano-Au was introduced by small weight percentages (0.25, 0.50, 0.75, 1.0, and 1.25 weight %). Phase identification and microstructuralcharacterization of the samples were investigated using XRD and SEM. Moreover, DC electrical resistivity as a function of the temperature, critical current density Jc, AC magnetic susceptibility, and DC magnetization measurements were carried to evaluate the relative performance of samples. x-ray diffraction analysis showed that both (Bi,Pb)-2223 and Bi-2212 phases coexist in the samples having an orthorhombic crystal structure. Both the onset critical temperatures Tc (onset) and zero electrical resistivity critical temperatures Tc (R=0) of the samples were determined from the DC electrical resistivity measurements. An improvement of the superconducting transition temperature of 6.36 % was obtained with increasing Au nanoparticles to x = 1.25 wt.%, while the critical current density is improved by 220 %. AC magnetic susceptibility measurement showed that the diamagnetic fraction and intergranular coupling of the x = 1.25 wt.% sample are greater than those of the others. The variation of magnetization with temperature (M-T curve) of the samples was measured by cooling the sample in zero fields (ZFC) and an applied field of 10 Oe (FC). The results of AC magnetic susceptibility and DC magnetization measurements were in good agreement with DC electrical resistivity measurement.

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