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3 edition of Alternating-field susceptometry and magnetic susceptibility of superconductors found in the catalog.

Alternating-field susceptometry and magnetic susceptibility of superconductors

# Alternating-field susceptometry and magnetic susceptibility of superconductors

Published by U.S. Dept. of Commerce, National Institute of Standards and Technology, Order from National Technical Information Service in Boulder, Colo, [Springfield, VA .
Written in English

Subjects:
• Superconductors.,
• Magnetic susceptibility.

• Edition Notes

The Physical Object ID Numbers Statement R.B. Goldfarb, M. Lelental, C.A. Thompson. Series NISTIR -- 3977. Contributions Lelental, M., Thompson, C. A., National Institute of Standards and Technology (U.S.) Format Microform Pagination 1 v. Open Library OL18067510M

ABSTRACT Non-technical abstract The superconducting intermediate state is formed in elemental (type-I) superconductors as a complex pattern of normal and superconducting regions. Newly developed experimental techniques may lead to a substantial revision of our current understanding of this state. These techniques allow one to observe local magnetic .   "High magnetic-field measurements of doped copper-oxide superconductors are paving the way to a new theory of superconductivity," said Brad Ramshaw, a Los Alamos scientist and lead researcher on.

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### Alternating-field susceptometry and magnetic susceptibility of superconductors Download PDF EPUB FB2

This review critically analyzes current practice in the design, calibration, sensitivity determination, and operation of alternating-field susceptometers, and examines applications in magnetic susceptibility measurements of by: Alternating-Field Susceptometry and Magnetic Susceptibility of Superconductors.

Published. January 1, Author(s) Ronald B. Goldfarb, M Lelental, C A. Thompson. Citation. Magnetic Susceptibility of Superconductors and Other Spin Systems. Publisher Info. Plenum Press, New York, NY. Pub Type. Books. Superconducting electronics and Cited by: Magnetic susceptibility of superconductor s an d othe r spin systems edited by Rober t A.

Hein, Thomas L. Francavilla, and Donal d H. Liebenberg. "Proceedings of th e Office of Nava l Research Workshop on Magneti c Susceptibility of Superconductors and Othe r Spin Systems, held Ma y.

The workshop entitled Magnetic Susceptibility of Superconductors and other Spin Systems (S4) was held at Coolfont Resort and Health Spa. located near Berkley Springs West Virginia on May There were over sixty attendees. Get this from a library.

Alternating-field susceptometry and magnetic susceptibility of superconductors. [R B Goldfarb; M Lelental; C A Thompson; National Institute of Standards and Technology (U.S.)]. Goldfarb R B, Lelental M and Thompson C A Alternating-field susceptometry and magnetic susceptibility of superconductors Magnetic Susceptibility of Superconductors and Other Spin Systems ed R A Hein et al (New York: Plenum) p CrossrefCited by: 5.

The fabrication of an AC magnetic susceptibility measurement system for the characterization of superconductors has been developed. Magnetic susceptibility describes the magnetic characteristic of materials, it is a measure of the ease with which certain materials are magnetized when subjected to a magnetic field.

The mutual inductance method and the lock-in technique. The measurement of the AC magnetic susceptibility as a function of temperature is a fast, contactless and powerful tool for studying magnetic or superconducting materials []. In the case of superconductors, the real (χ’) and imaginary parts (χ”) of the AC susceptibility represent measures of.

In the small signal regime, an AC magnetization M ac = χ H ac is induced by an alternating field, where χ is a susceptibility tensor. In bulk magnetic systems, low frequency susceptibility (including the use of higher order susceptibility,) measurements are used extensively to monitor myriad phenomena from the onset of ferromagnetism at the Cited by: 2.

Alternating-Field Susceptometry and Magnetic Susceptibility of Superconductors. Chapter. Jan ; R. Goldfarb; Unusual features in the susceptibility of superconductor.

Amit, you could also think in a simple way that Meissner state implies a zero magnetic induction (B=0) inside the sample. Since: B = H+ 4pi M (CGS system) and susceptibility Xi =. The dependence of the normal state resistivity, resistive and magnetic superconducting transitions (T c, Δ T c) and of the upper critical field slope (dH C2 /dT| T=Tc) on density has been investigated for several YBa 2 Cu 3 O 7 samples.

Resistivity decreases rapidly with increasing density whereas T c and resistive Δ T c are insensitive to apparent density. However Δ T' c Cited by: 8. Journal of Crystal Growth () — North-Holland Single-crystal growth and low-field AC magnetic susceptometry of YBa 2Cu ~, ErBa 2Cu _ ~, and Bi 2Sr2Ca 08Cu superconductors T.F.

Ciszek and C.D. Evans Solar Energy Research Institute, Golden, ColoradoUSA We obtained single-crystal YBa 2Cu and ErBa 2Cu _5 platelets Cited by:   Hein R A, Francavilla T L and Liebenberg D H Alternating-field susceptometry and magnetic susceptibility of superconductors Magnetic Susceptibility of Superconductors and other Spin Systems (New York: Plenum) pp 49– CrossrefCited by: 1.

Goldfarb, M. Lelental, and C. Thompson, "Alternating-field susceptometry and magnetic susceptibility of superconductors," NISTIR().

Contributions of NIST, not subject to copyright. Ishida and R. Goldfarb, "Fundamental and harmonic susceptibilities of YBa 2 Cu 3 O 7-δ," Physical Review B 41, (). Volume susceptibility. Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field.A related term is magnetizability, the proportion between magnetic moment and magnetic flux density.

A closely related parameter is the permeability, which expresses the total. Home Browse by Title Periodicals International Journal of Measurement Technologies and Instrumentation Engineering Vol. 1, No. 3 AC Magnetic Measurements on Superconductors: Design of a Device for Magneto-Thermal MeasurementsAuthor: LaurentPhilippe, FagnardJean-François, VanderbemdenPhilippe.

ac Susceptibility Measurements in High-T c Superconductors ACS 3 Susceptibility A magnetic material is described by its magne-tization M(r), or magnetic dipole moment per unit volume at points r throughout its volume.

Recall that the SI unit of magnetic dipole mo-ment is Am2 and thus the SI unit of magne-tization is A/ Size: KB. Soon after the book went out of print. However, it continues to be widely used and quoted, and due to the ever growing interest in "Magnetic Flux Structures in Superconductors", a second edition is now being made available.

An extensive new chapter gives a comprehensive review of developments relevant to high-temperature by: PH Introduction to superconductors 4 Effect of trapped magnetic flux Consider a ring made out of superconductive material.

Perform the following thought experiment: 1. At T>Tc the material is normal state. When the external magnetic field is turned on, it penetrates through the ring.

Reduce the temperature so that TFile Size: KB. Magnetic Susceptibility of Superconductor Ricardo Vasquez Department of Physics, Purdue University, West Lafayette, IN April Abstract Superconductors experience a drastic change in magnetic properties at critical temperatures and below.

High temperature superconductors have the same behavior. The. The ac magnetization and the microwave surface resistance (at 12 GHz) were measured on a series of Na‐doped YBCO ceramic samples at 77 K. Their magnetic behavior was explained on the basis of the modified critical state model by taking into account the existence of a field‐dependent component J c1 (due to weakly linked grains) and a field‐independent Cited by: 4.

A variable temperature, two-coil (a and b), two position ac susceptometer has been used to also perform absolute dc moment measurements using an extraction measurement technique. Virtually no hardware modifications were required and the full ac measurement capability is maintained.

The signal analysis for the moment measurement is done using a high speed Cited by: 4. Goldfarb has written: 'Alternating-field susceptometry and magnetic susceptibility of superconductors' -- subject(s): Magnetic susceptibility, Superconductors.

By definition of magnetic susceptibility. X = M/H. Put equation (1) Thus X = But magnetic susceptibility is negative for diamagnetic materials, thus it proves that superconductors are diamagnetic by nature.

Fickett National Bureau of Standards, Boulder, CO Accepted: Novem The origins, definitions, and measurement of the various critical magnetic fields associated with super-conductors File Size: 1MB. assuming the vertical rate of change of magnetic field is nearly constant and denoting the average magnetic field as B, we have $$-B\frac{dB}{dz}=\mu_{0}\rho g$$ Compare with diamagnetic levitation (superconductor's magnetic susceptibility is -1).

Now, Earth magnetic field is between 25 to 65 μT. @article{osti_, title = {MAGNETIZATION OF HIGH-FIELD SUPERCONDUCTORS}, author = {Bean, C P}, abstractNote = {Experimental results and phenomenological theory based on the sponge model for hysteretic high-field superconductors are given.

After developing the exposition for static magnetization, the response of the superconductors to alternating fields. @article{osti_, title = {Alternating field loss in a multifilament superconducting wire for weak ac fields superposed on a constant bias}, author = {Carr, Jr, W J and Walker, M S and Murphy, J H}, abstractNote = {Expressions are given for the alternating field loss in a twisted filamentary superconductor as a function of frequency and magnetic field, for the case of.

In superconductivity, a type-II superconductor is a superconductor which exhibits an intermediate phase of mixed ordinary and superconducting properties at intermediate temperature and fields above the superconducting phases.

It also features the formation of magnetic field vortices with an applied external magnetic occurs above a certain critical field.

Critical Magnetic Field The superconducting state cannot exist in the presence of a magnetic field greater than a critical value, even at absolute zero. This critical magnetic field is strongly correlated with the critical temperature for the superconductor, which is in turn correlated with the bandgap.

Type II superconductors show two critical magnetic field values, one at the. magnetic field ratio of anisotropic magnetic superconductors are calculated by Ginzburg-Landau theory analytically. The effect of the Ginzburg-Landau parameter(κ0), magnetic susceptibility(χ) and magnetic-to- anisotropic parameter ratio(θ) on.

Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this Thermal scanning alternating current susceptometry with multiple pick-up coils for ranging local M. Lelental, and C. Thompson, in Magnetic Susceptibility of Superconductors and Other Spin Systems, edited by R.

Hein et Cited by: 5. Superconductivity and magnetic fields are normally seen as rivals – very strong magnetic fields normally destroy the superconducting state. Physicists at the Paul Scherrer Institute have now Author: Paul Piwnicki. Magnetic and Electronic Properties of π-d Interacting Molecular Magnetic Superconductor capacity, magnetic susceptibility on temperature, and the corresponding inelastic neutron scattering Similar to other magnetic materials, molecular magnets also exhibit a magnetocaloric effect (MCE).

Upper critical field. The upper critical field (UCF) is the magnetic field (usually expressed in teslas (T)) which completely suppresses superconductivity in a Type II superconductor at 0K (absolute zero). More properly, the UCF is a function of temperature (and pressure) and if these are not specified, absolute zero and standard pressure are implied.

Superconductors expels out magnetic flux completely, below the transition temperature Tc, this phenomenon is known as Meisnner effect.

When a long cylinder superconductor is cooled in the magnetic field to below its transition temperature, the lines of induction will be pushed out the material due to infinite conductivity.

A thermocouple attached to the superconductor also measured the temperature of it as it was cooled. This data was used to calculate the inductance of the coil as a function of temperature.

I need to convert this somehow to susceptibility as a function of temperature, but since I lack other data such inductance of the coil in a vacuum, I do not.

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Goldfarb et al, "Alternating-Field Susceptometry and Magnetic Susceptibility of Superconductors" (Office of Naval Research Workshop on Magnetic Susceptibility of Superconductors and Other Spin Systems, Berkeley Springs, W. May ).

Room-temperature susceptometer. Viewed as a problem in magnetic measurement, liver susceptometry is difficult because the magnetic field from liver iron may be 10 7 or 10 8 times smaller than the field we apply to the patient.

This small response must be measured in the presence of the applied field, since the magnetization disappears when the field is by: Superparamagnetism is a form of magnetism which appears in small ferromagnetic or ferrimagnetic sufficiently small nanoparticles, magnetization can randomly flip direction under the influence of temperature.

The typical time between two flips is called the Néel relaxation the absence of an external magnetic field, when the time used to measure .Magnetic dynamics in iron-based superconductors probed by neutron spectroscopy Alice E. Taylor Jesus College, University of Oxford DPhil Thesis, Trinity Term Abstract This thesis describes inelastic neutron scattering (INS) experiments on several iron-based materials.

The experiments were primarily designed to investigate the link be.