Fall Semester 2008, Tuesday and Thursday: 9:30 - 10:50 a.m. Room: physics 43
lecturer: Ruslan Prozorov, office: Zaffarano A119, office phone: 294-9901, prozorov@ameslab.gov
prerequisites: 304 Thermal Physics and 322 Introduction to Modern Physics II
office hours: After lectures, 11AM-12PM
Texts:
Base texts:
Ch. Kittel, "Introduction to Solid State Physics", 8th Edition, (John Wiley and Sons, New York, 2004), ISBN 0-471-41526-X
N. W. Ashcroft and
N. D. Mermin, "Solid State Physics", (Holt, Rinehart and Winston,
New York, 1976), ISBN: 0-030-83993-9.
Additional:
A. A. Abrikosov, "Fundamentals of the Theory of Metals", (Elsevier Science Pub Co., 1988), ISBN: 0-444-87095-4.
L. -P. Levy, "Magnetism and Superconductivity", (Springer, 2000), ISBN: 3-540-66688-5
M. Tinkham, "Introduction to Superconductivity", 2nd edition, (Dover Publications, Inc., New York, 1996), ISBN: 0-486-43503-2.
NOTE: some material will only be available during the lecture and will not appear in the books. All homeworks, tests and exams will be based on the lectures. Therefore, attendance is important.
Homework: distributed each Tuesday, due on Tuesday a week after.
Paper copy of the solved homework must be placed into the grader's mailbox. Remember indicate your name.
No late submissions will be accepted.
Grader: Ming Li, office A526, office phone: 4-3876, e-mail: Ming Li [mli@iastate.edu].
Grading: Based on homework (40%), midterm exam (20%), and final exam (40%).
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Reading |
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8/26 | Lecture 1: MAGNETISM:Introduction: magnetic response of substanses. Units, conventions, terminology and definitions. Effects of the shape (demagnetisation factors). | CK (p. 299) | ||
| 8/28 | Lecture 2: Para- and Dia- magnetism: Landau and Larmor diamagnetism. Pauli, Van Vleck and free-moment (Langevin) paramagnetism. | AM (pp. 643-657) CK (pp. 299-318) |
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9/2 | Lecture 3: Mean Field Theory - I: Brillouin and Langevin functions. Magnetization of spin 1/2 system. | AM (654-656) CK (302-304) |
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| 9/4 | Lecture 4: Mean Field Theory - II: Weiss effective field. Curie-Weiss law. Ferromagnetic transition | AM (672-685) CK (321-329, 336-344) |
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9/9 | Lecture 5: Mean Field Theory - III: Magnetization vs H and T. Classification of Ferro-, ferri- and antiferro- magnetic materials | |||
| 9/11 | Lecture 6: Exchange interaction: Origin of the exchange interaction. Types of exchange. | ||||
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9/16 | Lecture 7: Magnons: ferromagnetic and antiferromagnetic spin waves | AM (704-712) CK (330-336, 344-345) |
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| 9/18 | Lecture 8: Anisotropy: origin of magnetocrystalline anisotropy, uniaxial and cubic cases, magnetostriction, surface versus bulk magnetism. Kramers theorem and Jahn-Teller distortion. | AM (720-722) |
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9/23 | Lecture 9: Itinerant Magnetism: basic principles of band magnetism. Stoner instability and candidate materials (Fe, Co, Ni, Pd) | AM (682-684) CK (329-330) |
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| 9/25 | Lecture 10: Thermodynamics: magnetic energy and work, thermodynamic potentials. Phase transitions: Ehrenfest classification: entropy behavior at the transition | AM (644-645,699-701) CK (474-478) |
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9/30 | Lecture 11: Landau theory of phase transitions: order parameter and correlation length. Second-order transitions. Quantum criticality. | |||
| 10/2 | Lecture 12: Experimental methods: Imaging of magnetic domains. DC and AC Magnetometry, neutron scattering, x-ray diffraction, calorimetry, magnetic resonances. | AM (696-702) |
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10/7 | Lecture 13: Size effects: ferromagnetic materials at the nanoscale. Superparamagnetism. Irreversibility under superparamagnetic blocking. Magnetic relaxation. | CK (354-356,358) | ||
| 10/9 | Lecture 14: Fluctuations: Critical scaling. Ornstein-Zernike theory, renormalization. Thermal vs Quantum fluctuations. | AM (699-701, 712-714, 723) | |||
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10/14 | Lecture 15: SUPERCONDUCTIVITY: Experimental Facts: Meissner effect, persistent currents, isotope effect. Characteristic lengths and critical parameters. | AM (725-736) CK (257-273) |
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| 10/16 | Lecture 16: London theory: explanation of the Meissner effect. Magnetization. Current and field distributions. Demagnetization factors | AM (737-739) |
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10/21 | Lecture 17: .Overview of magnetism - preparation for the Midterm Exam | no HW - prep for exam |
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| 10/23 | MIDTERM EXAM (Magnetism Only) |
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10/28 | Lecture 18: Ginzburg-Landau Theory - I: Complex order parameter. Characteristic lengths. Correspondence between BCS and GL theories. | AM (747-751) DOWNLOAD GL derivation |
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| 10/30 | Lecture 19: Ginzburg-Landau Theory - II: Energy of S/N boundary, proximity effect. Type I and type II superconductors. The Abrikosov Vortex. | ||||
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11/4 | Lecture 20: Bardeen-Cooper-Schrieffer (BCS) Theory: Cooper pairs, pair occupancy, energy gap, transition temperature, thermodynamic quantities | AM (739-747) CK (277-282) |
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| 11/6 | Lecture 21: BSC II : Temperature-dependent gap, excitation spectrum, density of states, coherence length, unconventional superconductors (non s-wave pairing) | ||||
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11/11 | Lecture 22: Two types of superconductors: Individual vortex. The intermediate state. | CK (283-287) | ||
| 11/13 | Lecture 23:Type II superconductors: Vortex lattice. Reversible magnetization. Flux flow. | RP lecture | |||
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11/18 | Lecture 24: Irreversible properties II: microscopic origins of flux pinning, critical current, single-vortex pinning, collective pinning.Bean model, irreversible magnetization, critical current, flux creep. Electric field in superconductors | |||
| 11/20 | Lecture 25: Josephson Effect: tunneling of single electrons and Cooper pairs. Various types of junctions. | ||||
THANKSGIVING BREAK - NO CLASSES |
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12/2 | Lecture 26: Experimental methods: Electromagnetic and thermal measurements at low temperatures. Spectroscopy. Angle-resolved photoemission. Neutron scattering. NMR. | AM (751-753) |
HW12 |
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| 12/4 | Lecture 27: DC and AC Superconducting Quantum Interference Device (SQUID) | ||||
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12/9 | Lecture 28: Unconventional superconductors: (anti) ferromagnetic superconductors, gapless superconductivity, high-Tc cuprates etc | CK (293) | ||
| 12/11 | Lecture 29: Review of superconductivity before the final exam. | ||||
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12/15 | FINAL EXAM: MONDAY, 15 December 2008, 9:45 a.m. - 11:45 a.m. |
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