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Thesis on superconductivity
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Recommended: Thesis on superconductivity
New Superconductors: Advances, Issues, Limitations
Report by Amber Taylor
CHME 5699
Dr. Laura Lewis
Final Report
23 April 2014
Executive Summary
One of the most exciting and magical phenomena observed today in science is the levitation of superconductors in the presence of a magnetic field. While entertaining, this effect is also extremely useful and could combat one of the largest issues facing the world today: how can we continue to transport goods and people without burning fossil fuels which harm the Earth’s atmosphere? Better yet, how can we store energy harvested from renewable sources for long periods of time? The answer could be superconductors in conjunction with powerful magnets.
Superconductors currently exist at very low temperatures, generally between 0-10K. If room-temperature superconductors can be produced repeatedly under standard conditions, the Earth’s energy crisis would be considerably alleviated and a new era of super technology would be ushered in.
Statement of topic
This report summarizes advances, issues, and limitations in new high-temperature superconductors. Included are significance, prior research and discoveries, as well as the most advanced prediction and formulation methods to date. Within the confines of this report only Type 2 superconductors have been considered for simplicity and relevancy.
Introduction and Background
Superconductivity was first discovered a century ago in 1908 by Dutch physicist Heike Onnes[1] and is defined in classical physics as “perfect conductivity” or exactly zero electrical resistance (figure 1). With the discovery of the Meissner Effect in 1933, a new theory of superconductivity was formulated by Fritz and Hein London in 1935 stating superconductivity ...
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...d above in reference to elasticity modulus.
Methodology and Results
All information provided within this report can be accessed on the World Wide Web. Specifically the sources below provide excellent detail around modern superconductor theories and methodologies. There appears to be consensus regarding the importance of the mechanism of HT superconductivity.
Conclusions
Advances, issues, and limitations of high-temperature superconductors were explored within this report. The theory of superconductors as well as their history and most recent discoveries was addressed. Finally, current methods of increasing the critical temperature of superconductivity was presented and discussed. It was found that suppressing lattice vibrations, studying Meissner transitions, and controlling grain boundaries can help understand the mechanism of high temperature superconductivity.
Maglev, short for magnetic levitation, is a new system being used in the design of train railways. These maglev trains are using electromagnetically-driven systems to achieve high –speed transportation. These trains move through electromagnetic propulsion, levitating over a guideway.
In 1924 Albert Einstein predicted the existence of a special type of matter now known as Bose-Einstein condensation. However, it was not until 1995 that simple BEC (Bose-Einstein condensation) was observed in a low-density Bosonic gas. This recent experimental breakthrough has led to renewed theoretical interest in BEC. The focus of my research is to more accurately determine basic properties of homogeneous Bose gases. In particular nonuniversal effects of the energy density and condensate fraction will be explored. The validity of the theoretical predictions obtained is verified by comparison to numerical data from the paper begin{it}Ground State of a Homogeneous Bose Gas: A Diffusion Monte Carlo Calculation end{it} by Giorgini, Boronat, and Casulleras.
* Halliday, David, Robert Resnick and Jearl Walker. Fundamentals of Physics, 5th ed. John Wiley and Sons, Inc., 1997.
Johnson, J. S., & Newport, E. L. (1991). Critical period effects on universal properties of
..., but if these formulated seemingly magical room temperature super conductors would completely change that. These super conductors would allow us to carry almost infinite voltage in current with virtually no heat being transferred to the holding apparatus humans could effectively build incredibly strong magnetic fields, field that are 1000s of times stronger than those achieved by either helium, titanium, or niobium just to name a few, compounds that are used in experimental fusion reactors or tok-maks. With the level that these conducting devices will offer the initial energy distribution or density humans could build what has been postulated for almost a century. A thermo-nuclear power plant that is not only safe, but completely self sustaining and sufficient with enough power to that could give humans power for decades, or as some have predicted, even centuries.
Have you ever seen a levitating orb? A real orb just floating in the air. This is not some magic trick, it is science. To make the orb levitate you must first know about electricity and how it works. Static electricity is what causes it to levitate.
Superconductivity, a similar phenomenon, was discovered in 1911 by Dutch physicist Heike Kamerlingh Onnes. When he cooled some mercury down to liquid helium temperatures, it began to conduct electricity with no resistance at all. People began experimenting with other metals, and found that many tranisition metals exhibit this characteristic of 0 resistance if cooled sufficiently. Superconductors are analagous to superfluids in that the charges within them move somewhat like a superfluid - with no resistance through sections of extremely small cross-sectional area. Physicists soon discovered that oxides of copper and other compounds could reach even higher superconducting temperatures. Currently, the highest temperature at wich a material can be superconductive is 138K, and is held by the compound Hg0.8Tl0.2Ba2Ca2Cu3O8.33.
Traditionally in school we are taught that there are only four states of matter: solid, liquid, gas, and plasma. Fortunately this is not true as that would be boring. There are also at least 4 other-less common states and Icontest a fifth. These are Bose-Einstein condensate, photonic molecules, quark-gluon plasma, superconductors, and superfluids. They all have unique properties that clearly distinguish differences between them and the traditional four states. These breakthroughs could help us in the future and have some practical uses right now.
Super conductivity is a natural phenomenon in which certain materials such as metals, alloys, and ceramics, can conduct electricity without resistance. These materials are what we call superconductors. In a superconductor, once the flow of electrons begins, it essentially goes on forever, making it an important material to humans. Superconductivity was discovered by a Dutch scientist by the name of Heike Kamerlingh Onnes in 1911. While researching properties of materials at absolute zero, this man found out that certain materials lost its resistance to the flow of electrons. For years to come, his discovery was at the head of theoretical interest. The only problem though, was that people at that time could not even think of a way to produce such a temperature, to allow materials to be superconductors at all times. This all changed in 1986 when Karl Muller and George Bednorz were working at the IBM Research Division in Zurich, Switzerland. They found a material that reached superconductivity at around 35 degrees Kelvin or –238 degrees Celsius. In the next year, a team of Chinese-American physicists declared that they had found a material that reached superconductivity at 92 degrees Kelvin. This was a big improvement. 92 degrees Kelvin is not a very high temperature, in fact, it is the equivalent of –181 degrees Celsius. Locating superconducting material above 77 degree Kelvin is a good thing because it means that the material will be easily produced and used. A theoretical understanding of superconductivity was advanced in 1957 by American physicists John Bardeen, Leon Cooper, and John Schrieffer. Their Theories of Superconductivity became know as the BCS theory (which came from each mans last name) and won them a Nobel prize in 1972. The BCS theory explained superconductivity at temperatures close to absolute zero. However, at higher temperatures and with different superconductor systems, the BCS theory has consequently became insufficient to fully explain electron behavior. The Type 1 category of superconductors is basically made up of pure metals that normally show conductivity at room temperature. They require really cold temperatures to slow down molecular vibrations enough to facilitate unrestrained electron flow in agreement to the BCS theory. BCS theory suggests that electrons team up in cooper pairs in order to help each other overcome molecular obstacles. Type 1 superconductors were discovered first and require the coldest temperatures to become superconductive. They are characterized by a very sharp transition to a superconducting state.
The superconductivity state of a metal exists only in a certain range of temperature and field strength.
Condensed Matter Physics, in its early conception, was not known by its more modern terminology but emanated from Solid State Physics. Comparable to Astronomy, Solid State Physics is the oldest subcategory of what we now refer to as Physics. Condensed-matter physics is broader and applies to concepts that work in solids, but could equally be applied to liquids: superconductivity vs. superfluidity, and soft-condensed matter. Condensed Matter Physics has contributed properties of materials including electronic, magnetic, dynamical, mechanical, and thermo-dynamical properties of nanoscale systems and materials such as but not limited to: Metals and alloys, semiconductors, superconductors, polymers, ceramics, crystal, amorphous and cluster-like states. Condensed Matter Physics is interdisciplinary and intertwined with inorganic chemistry, physical chemistry, quantum chemistry, electrical and mechanical. It tries to connect the properties of the nuclei and electrons to the macroscopically observed quantities. As in other fields of study, advancement in condensed matter resulted from impro...
The Earth’s magnetic field is a major component to exploring the earth. The north and the south poles have always been a guide for travelers. Using compasses, the direction of the north pole and the south pole has always been provided by the magnetic force of the magnetic field. What many people do not know though is the earth’s magnetic field provides way more than that. The magnetic field, also known as the magnetosphere, protects us from all kinds of harmful substances. Some of these substances include solar wind and harmful radiation from the sun. The magnetosphere also protects the atmosphere, which protects us.
[2] H.D. Young, R.A. Freedman, and A.L. Ford, University Physics with Modern Physics (Pearson 2012; 13th ed.) (Layperson part)
The development of superconductors has been a working progress for many years and some superconductors are already in use, but there is always room for improvement. In 1911, Dutch physicist Heike Kamerlingh Onnes first discovered superconductivity when he cooled mercury to 4 degrees K (-452.47º F / -269.15º C). At this temperature, mercury’s resistance to electricity seemed to disappear. Hence, it was necessary for Onnes to come within 4 degrees of the coldest temperature that is theoretically attainable to witness the phenomenon of superconductivity. Later, in 1933 Walter Meissner and Robert Ochsenfeld discovered that a superconducting material will repel a magnetic field. A magnet moving by a conductor induces currents in the conductor, which is the principle upon which the electric generator operates. However, in a superconductor the induced currents exactly mirror the field that would have otherwise penetrated the superconducting material - causing the magnet to be repulsed- known today as the “Meissner effect.” The Meissner effect is so strong that a magnet can actually be levitated over a superconductive material, which increases the use of superconductors. After many other superconducting elements, compounds, and theories related to superconductivity were developed or discovered a great breakthrough was made. In 1986, Alex Muller and Georg Bednorz invented a ceramic substance which superconducted at the highest temperature then known: 30 K (-243.15º C). This discovery was remarkable because ceramics are normally insulators – they do not conduct electricity well. Since their discovery the highest temperature for superconductivity to occur is 138 K (-130.15º C).
... & Magnetism Pages." National High Magnetic Field Laboratory: Museum of Electricity and Magnetism. N.p., n.d. Web. 13 Nov. 2013.