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Sunday, July 26, 2020 | History

4 edition of Pressure dependence of superconducting properties of MgB2 found in the catalog.

Pressure dependence of superconducting properties of MgB2

by Henrich Ploczek

  • 250 Want to read
  • 21 Currently reading

Published by Brock University, Dept. of Physics in St. Catharines, Ont .
Written in English

    Subjects:
  • Magnesium diboride.,
  • Superconductors.,
  • Superconductivity.

  • Edition Notes

    Statementby Henrich Ploczek.
    The Physical Object
    Paginationvii, 57 leaves :
    Number of Pages57
    ID Numbers
    Open LibraryOL23367457M

    Detailed electronic structure studies on superconducting MgB2 and related compounds P. Ravindran,* P. Vajeeston, R. Vidya, A. Kjekshus, and H. Fjellva˚g mental results regarding the anisotropy in the elastic properties of MgB2 ranging from isotropic to moderately pressure study along with density functional calculations. thermal conductivity of high-temperature superconductors. ctirad uher; the influence of high pressure on the superconducting and normal properties of high temperature superconductors. physical properties of high temperature superconductors iii. tunneling spectroscopy of oxide superconductors.

    The linear temperature dependence of critical current density J c ∝((T c-T)/(T c-T 0)) and the nonlinear functions of J c ∝(1-(T/T c) 2) α with the exponent α equal to 1, 3/2, and 2 are used to calculate the dynamic levitation force, the temperature distribution, and the current density distribution of the high-temperature superconducting (HTS) YBaCuO bulk over a permanent . Superconducting Properties of MgB 2 from First Principles In Fig. 2(a), the superconducting gaps are plotted versus temperature, together with a few recent experimental re-sults. The agreement is striking: the values of T c ( K) and of and at T our investigation. Another important aspect is to gain0Kare very close to theCited by:

    Evaluation of Mg size dependence on superconductivity of MgB2 Abstract MgB2bulk samples are synthesized through solid state reaction route using Mg precursors with different particle size by keeping the boron precursor unchanged. Scanning electron microscopy study of the fractured. carbon-doped MgB2 at ambient pressure [17]. In the study of superconductivity, pressure has been shown to be an indispensable tool. For example, Si, normally a semiconductor, was predicted to become metallic and then superconducting under pressure. This was soon confirmed by experiments [18, 19]. Also, the highest transition temperature ever.


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Pressure dependence of superconducting properties of MgB2 by Henrich Ploczek Download PDF EPUB FB2

Pressure-transmittingmedium,afluidatroomtemperature,freezesatacertaintemper- ature and introducesashear stress. This stress canthencausedeformations and lattice.

The dependence of Tc on hydrostatic (He-gas) pressure for superconducting MgB2 has been determined to GPa. We find that Tc decreases linearly and reversibly under pressure at. Systemic investigation was carried out on the microstructure, superconducting properties, and flux pinning mechanism of MgB2 in-situ fabricated with magnesium and g.

The dependence of T c for MgB 2 on purely hydrostatic or nearly hydrostatic pressure has been determined to 29 GPa for single-crystalline and to 32 GPa for polycrystalline samples, and found to be in good agreement.

T c decreases from 39 K at ambient pressure to 15 K at 32 GPa with an initial slope dT c /dP≃−(2) K/GPa. Evidence is presented that the differing values of dT c Cited by: The dependence of T c on nearly hydrostatic pressure has been measured for an isotopically pure (11 B) MgB 2 sample in a helium-loaded diamond-anvil-cell to nearly 20 GPa.

T c decreases monotonically with pressure from K at ambient pressure to K at GPa. The initial dependence is the same as that obtained earlier (dT c /dP≃−(2) K/GPa) on the same Cited by: INSTITUTE OF PHYSICS PUBLISHING SUPERCONDUCTOR SCIENCE AND TECHNOLOGY Supercond.

Sci. Technol () R–R PII: S(01) TOPICAL REVIEW Review of the superconducting properties of MgB 2 Cristina Buzea1,2 and Tsutomu Yamashita2,3 1 ResearchInstituteof ElectricalCommunication,Tohoku University,Sendai ,Japan 2.

High-density bulk materials of a recently discovered 40 K intermetallic MgB2 superconductor were prepared by high-pressure sintering. Superconducting transition with the onset temperature of 39 K was confirmed by both magnetic and resistive measurements.

Magnetization versus field (M–H) curve shows the behavior of a typical type-II superconductor and the lower critical field Hc1(0) Cited by: Abstract.

The normal state and superconducting properties of MgB 2 and Mg 1-x Al x B 2 are discussed based on structural, transport, and high-pressure experiments. The positive Seebeck coefficient and its linear temperature dependence for T c 2 is due to hole-like metallic carriers.

Structural and transport Author: B. Lorenz, Y. Xue, R. Meng, C. Chu, C. Chu. 1 TOPICAL REVIEW Review of superconducting properties of MgB2 Cristina Buzea 1, 2 and Tsutomu Yamashita 2, 3 1 Research Institute of Electrical Communication, Tohoku University, SendaiJapan 2 New Industry Creation Hatchery Center, Tohoku University, SendaiJapan 3 CREST Japan Science and Technology Corporation (JST) Received 15.

This review paper illustrates the main normal and superconducting state properties of magnesium diboride, a material known since early 's, but recently discovered to be superconductive at a remarkably high critical temperature Tc=40K for a binary compound.

What makes MgB2 so special. Its high Tc, simple crystal structure, large coherence lengths, Cited by: 7. We successfully prepared superconducting powders of magnesium diboride doped with carbon nanotubes by the method of combustion synthesis under high Ar pressure.

Powders of magnesium, boron, and multi-walled carbon nanotubes (MWCNT) were used as starting materials. X-ray diffraction analysis showed the presence of MgB2 and MgO in combustion Cited by: 3. Superconductivity. Magnesium diboride's superconducting properties were discovered in Its critical temperature (T c) of 39 K (− °C; − °F) is the highest amongst conventional conventional (phonon-mediated) superconductors, it is electronic structure is such that there exist two types of electrons at the Fermi level with widely Chemical formula: MgB₂.

a, b, The superconducting energy gap on the Fermi surface at 4 K given using a colour scale (a), and the distribution of gap values at 4 K (b).The Fermi surface of MgB 2. Thickness dependence of superconducting properties in MgB2 thin films Douglas B.

Beringer Department of Physics The College of William and Mary TFSRF New Ideas Workshop J Collaborators & Acknowledgements Sample Preparations Teng Tan and Dr. Xiaoxing Xi — Temple University.

Magnetic field dependence of critical current density Figure3shows magnetic field dependence of critical current density (Jc) for IMD-processed and PIT-processed MgB2 superconducting wires at K.

Jc was deduced by Ic divided by the cross-sectional area of the superconducting layer (see table1). : Pinning Disorders in MgB2: Effects of Pinning Disorder on Multiband Transport Properties of Superconducting Magnesium Diboride Author: Som Datta Kaushik.

Properties of MgB2 products (Jc, Hc2) from Phase I are among the highest reported to date for MgB2 bulk superconductors. Chemically doped MgB2 superconducting magnets can perform at least as well as NbTi and NbSn3 in high magnetic fields and still offer an improvement over the latter two in terms of operating temperature.

correct. Despite an overall isotropic behaviour of MgB2 in conductors observed by many authors, there are small anisotropies in the mechanical properties. The electronic structure under pressure reveals the 2-dimensional character of the B pxy states whose occupancy is altered by pressure in contrast to the B pz states [8].

Anisotropic File Size: 2MB. Superhard Superconductive Composite Materials Obtained by High-Pressure-High-Temperature Sintering. materials are of considerable interest for the creation of high pressure devices for investigating electrical and superconducting properties of various materials.

Temperature dependence resistance of R for MgB2:С60 - wt. % at Author: Sergei Buga, Gennadii Dubitsky, Nadezhda Serebryanaya, Vladimir Kulbachinskii, Vladimir Blank. Carbon Nanotubes Addition Effects on MgB2 Superconducting Properties The strong temperature dependence of the coherence length is probably the main reason to the observed temperature dependence in the pinning properties with CNT additions: the reduction of the coherence length (that decreases the pinning energies) and the increase in the Cited by: 3.

superconducting behaviour occurred, the material showed a metallic behaviour upon cooling with a ratio of electrical resistivities ρ( K) ρ(40 K) = at GPa pressure and the ratio increased linearly with pressure, reaching at GPa pressure.

Figure 3 shows the dependence of the lattice parameters a and c and the unit-cell [email protected]{osti_, title = {Fabrication of Chemically Doped, High Upper Critical Field Magnesium Diboride Superconducting Wires}, author = {Marzik, James, V.}, abstractNote = {Controlled chemical doping of magnesium diboride (MgB2) has been shown to substantially improve its superconducting properties to the levels required for high field magnets, but the.

The high pressure (50 MPa - 2 GPa) – high temperature synthesized MgB2 bulk materials are characterized by nearly theoretical density (% porosity), % connectivity, extremely high critical current densities (e.g. at 20 K, in 0–1 T jc=– MAcm-2 (with 10% SiC) and jc= – MAcm-2 (without doping)), large irreversibility fields (Birr( K) =15 T Cited by: 3.