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This document discusses the interaction between magnetism and superconductivity. It describes different types of magnetism like ferromagnetism and diamagnetism. It also discusses the basics of superconductivity and how a superconducting state can be induced by a magnetic field. The document then focuses on the iron-based superconductor KxFe2-ySe2, including its crystal growth process and characterization techniques used to study it like X-ray diffraction and magnetization. It aims to understand how the different phases in KxFe2-ySe2 interact individually and with each other, and why high-temperature superconductors form.
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This document discusses magnetism and magnetic fields. It describes testing magnets by bringing specimens near magnet poles to observe attraction or repulsion. Induced magnetism occurs when an unmagnetized material becomes a magnet when near a permanent magnet. The document also discusses the theory of magnet domains, methods of magnetization and demagnetization, and plotting magnetic field lines. It provides examples of magnetic field patterns for single and multiple magnets, including the neutral point between magnets with like poles facing. Finally, it compares the magnetic properties of iron and steel.
Magnetism
This document summarizes different types of magnetism, including diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic, and ferrimagnetic. It discusses Curie's law and the Curie-Weiss law, which describe how magnetic susceptibility varies with temperature. The document also covers how to measure magnetic susceptibility using a Faraday balance or torsion balance, and how the magnetic behavior of different materials can be distinguished based on their magnetic susceptibility values and temperature dependence.
simple phenomena of magnetism
This document discusses the basic properties and phenomena of magnetism. It describes how magnets have magnetic fields and two poles (north and south) that attract or repel each other. Magnetic materials like iron and steel can be magnetized by magnets, while non-magnetic materials are unaffected. The magnetic fields of magnets can be visualized using iron filings or a plotting compass. The Earth also has a magnetic field like a bar magnet. Electromagnets produce magnetic fields when electric currents flow through their coils, unlike permanent magnets.
Magnetism
Magnets produce magnetic fields and have north and south poles. Opposite poles attract while like poles repel. Magnets work through magnetic domains within ferromagnetic materials which align to produce an overall magnetic field. Different materials have different magnetic properties depending on their composition and structure.
Magnetism
The document discusses several laws and concepts related to magnetism. It states that like poles of magnets repel each other, while unlike poles attract. A compass arrow points to magnetic north. Induced magnetism explains how magnetic materials can become magnetized when placed near a magnet due to magnetic induction. A magnetic field is the region around a magnet where its magnetic effects can be detected, with field lines running from the north to south pole. Permanent magnets made of steel retain their magnetism while temporary magnets made of iron lose theirs over time.
Magnetic material
This document provides information on various topics related to magnetism and magnetic materials:
1. It discusses different types of magnetic behavior such as diamagnetism, paramagnetism, and ferromagnetism. It also discusses the properties of hard and soft magnetic materials.
2. Key magnetic parameters are defined, including magnetic permeability, susceptibility, intensity of magnetization, Curie temperature, magnetic dipole moment, magnetic flux, and relative permeability.
3. The differences between diamagnetic, paramagnetic, and ferromagnetic materials are summarized in a table comparing their behaviors and properties.
4. The document also explains hysteresis loops, hard and soft magnets, and fer
Magnetism PowerPoint, Physical Science Lesson
The document contains notes from science lessons on electricity and magnetism. It includes definitions of key terms like magnet and electromagnetic field. Activities are described like building an electric engine, simulating magnetic fields, and using a compass. Students are instructed to record important notes in their science journals and demonstrate concepts like attraction and repulsion of poles during magnet activities. The document copyright is 2010 and appears to be materials for teaching middle school science.
Magnetism and Electromagnetism
The document discusses various topics related to magnetism including:
- The ancient discovery of magnetism in lodestone by the Chinese in 2000 BC who used it for navigation.
- The properties of magnets including having magnetic fields with poles that attract or repel other magnets and magnetic materials.
- Induced magnetism caused by an external magnetic influence.
- Differences between magnetic, non-magnetic, and magnetized materials and how to test for magnetism.
- Electrical and physical methods of magnetization and demagnetization.
- Plotting magnetic field lines using a compass to map field patterns.
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http://viavca.in2p3.fr/2010c_o_s_m_o_v_i_a__forum_sd24fsdf4zerfzef4ze5f4dsq34sdteerui45788789745rt7yr68t4y54865h45g4hfg56h45df4h86d48h48t7uertujirjtiorjhuiofgrdsqgxcvfghfg5h40yhuyir/search.php?fid[]=73&sid=2823a3c773ed9e04ae8ced343f6749a8
http://viavca.in2p3.fr/2010c_o_s_m_o_v_i_a__forum_sd24fsdf4zerfzef4ze5f4dsq34sdteerui45788789745rt7yr68t4y54865h45g4hfg56h45df4h86d48h48t7uertujirjtiorjhuiofgrdsqgxcvfghfg5h40yhuyir/viewtopic.php?f=73&t=3705&p=6208&hilit=lecian&sid=2823a3c773ed9e04ae8ced343f6749a8#p6208
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Author: O.M. Lecian
Speaker O.M. Lecian
Title: Some aspects of Fractons
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supersymmetric theories.
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achieved in accelerator experiments, cosmic-rays experiments, mass-spectrometer experiments, cantilever
experiments and experiments involving the gravitational interaction as well.
Other experimental limitations and theoretical constraints have to be taken into account.
Particles-recombinations modes and experimental searches are exposed.
http://viavca.in2p3.fr/2010c_o_s_m_o_v_i_a__forum_sd24fsdf4zerfzef4ze5f4dsq34sdteerui45788789745rt7yr68t4y54865h45g4hfg56h45df4h86d48h48t7uertujirjtiorjhuiofgrdsqgxcvfghfg5h40yhuyir/search.php?fid[]=73&sid=2823a3c773ed9e04ae8ced343f6749a8
http://viavca.in2p3.fr/2010c_o_s_m_o_v_i_a__forum_sd24fsdf4zerfzef4ze5f4dsq34sdteerui45788789745rt7yr68t4y54865h45g4hfg56h45df4h86d48h48t7uertujirjtiorjhuiofgrdsqgxcvfghfg5h40yhuyir/viewtopic.php?f=73&t=3705&p=6208&hilit=lecian&sid=2823a3c773ed9e04ae8ced343f6749a8#p6208
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Drexel Oral Qualifying Exam Presentation
- 1. Interaction Between Magnetism and Superconductivity Jeremie Doehla Adviser: Dr. Goran Karapetrov Department of Physics Drexel University June 4, 2013
- 2. Magnetism Ferromagnetism ● ● Spontaneous spin alignment Long range order Diamagnetism ● ● Negative magnetic susceptibility Perfect diamagnetism = Meissner effect
- 3. Superconductivity ● Perfect diamagnet ● Long range order ● BCS theory – Low temperature – Absence of magnetic field ● Type I ● Type II – vortex state
- 4. Free Energy (F) FerromagneticSuperconductor Hybrids Applied Magnetic Field ● A superconducting state may be induced by a magnetic field.
- 5. Proximity Effect ● ● When in contact with a normal or ferromagnetic material there is a penetration of the cooper pairs into said material. Ginzburg-Landau Equation:
- 6. KxFe2-ySe2 FeSe ● ● ● New materials (2008) Each phase may have a different magnetic order 1 phase found to be superconducting ● KFe2Se2-z ● K2Fe4Se5 ● ● Two structures of KFe2Se2 (different charge orderings) And Others KFe2Se2
- 7. KxFe2-ySe2: Crystal Growth ● ● ● ● Step 1: FeSe (vapor self transport) Step 2: KFe2Se2 (from melt) Post annealing/ quenching Contamination concerns
- 8. KxFe2-ySe2: Characterization ● ● Why is it a superconductor? How do the different phases interact with each other and behave independently? Techniques: ● X-Ray Diffraction ● Resistance ● Hall effect ● Magnetization
- 9. Characterization X-Ray diffraction: ● ● Crystal structure characterization Different crystal phases will have different characteristic peaks Resistivity: ● ● CDW Varies greatly with stoichiometry
- 10. Characterization Hall Effect ● ● Charge carrier FeSe has been found to have a change in the sign of the hall effect Magnetization ● Hc1, Hc2, magnetic susceptibility
- 11. Conclusion KxFe2-ySe2 ● ● In General Behavior of each phase individually ● Interaction between the different phases ● Why high temperature superconductors form Further investigate the fundamental relationship between magnetization and superconductivity
- 12. References ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● Ashcroft and Mermin. Solid State Physics. Brooks, Belmont, CA, 1976. A. I. Buzdin. Proximity eects in superconductor-ferromagnet heterostructures. Reviews of modern physics, 77, July 2005. T.-L. Xia D. M. Wang, J. B. He and G. F. Chen. Eect of varying iron content on the transport properties of the patassium-intercalated iron selenide k(x)fe(2-y)se(2). Physical Review B, 83, 2011. Bing Shen Zhen-yu Wang Chun-Hong Li Fei Han, Huan Yang and Hai-Hu Wen. Metastable superconducting state in quenched k(x)fe(2-y)se(2). Philosophical Magazine, 92, July 2012. Kuo-Wei Yeh Ta-Kun Chen Tzu-Wen Huang Phillip M.Wu Yong-Chi Lee Yi-Lin Huang Yan-Yi Chu Der-Chung Yan FongChi Hsu, Jiu-Yong Luo and Maw-Kuen Wu. Superconductivity in the pbo-type structure alpha-fese. Proceedings of the National Academy of Sciences, 105(38), September 2008. M. Decroux-O. Fischer G. Remenyi H. W. Meul, C. Rossel and A. Briggs. Observation of magnetic-eld-induced superconductivity. The American Physical Society, 53(5), July 1984. V. Jaccarino and M. Peter. Ultra-high-eld superconductivity. Physical Review Letters, 9(7), October 1962. Genda Gu J M Tranquada Jinsheng Wen, Guangyong Xu and R J Birgeneau. Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations. Reports on Progress in Physics, 74, September 2011. Hirano Kamihara, Watanabe and Hosono. Iron-based layered superconductor la[o(1-x)f(x)]feas(x = 0.05-0.12). Journal of the American Chemical Society, 130, March 2008. Charles Kittel. Introduction to Solid State Physics. John wiley and Sons, Inc., USA, 2005. I. F. Lyuksyutov and V. L. Pokrovsky. Ferromagnet-superconductor hybrids. Advances in Physics, 54(1), 2005. Ksenofontov Felser Xu Zandbergen Hor Allred Williams Qu Checkelsky Ong McQueen, Huang and Cava. Extreme sensitivity of superconductivity to stoichiometry in fe1+delta se. Physical Review B, 79, January 2009. Davin J. Morgan and J. B. Ketterson. Asymmetric ux pinning in a regular array of magnetic dipoles. Physical Review Letters, 80(16), April 1998. A.C. Rose-Innes and E.H. Rhoderick. Introduction to Superconductivity. Pergamon Press Ltd., Elmsford, New York, 1978. T. Terashima T. Yakabe Y. Terai M. Tokumoto A. Kobayashi H. Tanaka S. Uji, H. Shinagawa and H. Kobayashi. Magnetic-eld-induced superconductivity in a two-dimensional organic conductor. Letters to nature, 410, April 2001. Applied Superconductivity and Cryoscience Group. Lectures on superconductivity. Technical report, University of Cambridge. S. H. Yu S. Avci Z. L. Xiao H. Claus J. Schlueter V. V. Vlasko-Clasov U. Welp U. Patel, J. Hua and W. K. Kwok. Growth and superconductivity of fese(x) crystals. Applied Physics Letters, 94, 2009. Zhi Li Peng Deng Kai Chang Ke He Shuaihua Ji Lili Wang Xucun Ma Jiang-Ping Hu Xi Chen Wei Li, Hao Ding and QiKun Xue. Kfe(2)se(2) is the parent compound of k-doped iron selenide superconductors. Physical Review Letters, 109, 2012.
- 13. Acknowledgments ● Petra Husanikova ● Christopher Brown ● Joey Lambert ● Erica Smith
- 14. Sample carrier design ● Needs to fit down the central shaft of dewar ● Space considerations ● Thermal considerations ● Vacuum considerations ● Electrical contacts – – ● Sensors Utility Replaceable parts
- 15. Sample carrier design ● Still a work in progress ● Temperature sensor ● Heating ● Electrical leads
- 16. Crystal Growth and Measurements done (although, not related to KxFe2-xSe2) ● CuxTiSe2 ● Iodine vapor transport ● Grown on Temple's campus Measurements: ● Resistance vs. temperature Resistance measured (same place we will grow KxFe2-xSe2) Temperature (K)