Photo of Frank Bridges

 Frank "Bud" Bridges
Professor of Physics
Ph.D. University of California San Diego 1968
Alexander von Humboldt Fellowship 1976-77, 1979

Office: 214 ISB building
Address: Physics Dept., University Of California, Santa Cruz, 95064
Phone: (831) 459-2893
Fax: (831) 459-3043
Email: bridges@cats.ucsc.edu

  • Papers
  • Simulations
  • Crystal Structures

    • Structural Aspects of Condensed Matter Systems

    Structure plays an important role in understanding the physical properties of solid systems.  The recognition that most solids have a well defined atomic structure provided a unification of a number of subfields in physics and played an important role in the emergence of the field that we now know as condensed matter physics.  Professor Bridges works on a number of topics including the coupling between the crystal lattice and the electron system in correlated electron systems, the unusual properties of tunneling defect atoms, and the surface contact sticking between very cold frost-coated surfaces (dynamics of Saturn's rings).

    One of Bridges' major areas of research is the study of local structure in the vicinity of specific atoms using X-ray Absorption Fine Structure spectroscopy (XAFS).  This technique requires the very high x-ray intensity available at a Synchrotron source such as the nearby Stanford Synchrotron radiation Laboratory.  Materials investigated include quasicrystals, fullerenes, superconductors and, recently, the colossal magnetoresistance (CMR) materials.  In the Hg series of high Tc materials they have discovered the unusual phenomena of negatively correlated displacements for some pairs of atoms.  In the CMR materials they find a large change in the O disorder (associated with polaron formation) about the Mn atoms that is correlated with the sample magnetization.

    Another area is the study of atomic defects.  Using high frequency microwaves he has studied the tunneling properties of small defect atoms in crystals.  One of the reasons these systems are interesting is that they have a large number of local potential minima (typically 8-12) which results in a rich array of physical properties.

    In a rather different set of experiments Bridges and collaborators have studied the dynamics of ice particle collisions.  At very low speeds, ice particles are surprisingly elastic, comparable or better than super-balls (i.e., less than 10 % energy loss per collision).  The energy loss increases with velocity and for compacted frost-covered surfaces can be greater than 65 % at only 1 mm/s.  For freshly deposited water frost with a dendritic-like surface structure, the surfaces stick together in low speed contacts at low temperatures.  Most recently they have found that surface layers of methanol or water/methanol mixtures remain plastic to very low temperatures and provide much larger sticking forces in the 100 to 150K range than water frost.  These phenomena play an essential role in the dynamics in rings systems such as those on Saturn.  They are also important for understanding the aggregation processes as macroscopic objects (including comets) formed in the early Solar system.

    Bridges' research group involves a number of graduate and undergraduate students; a range of microwave, x-ray and cryogenic equipment are available.

     

    Selected Publications

    1. "Possible mechanism for glass-like thermal conductivities in crystals with off-center atoms ".  F. Bridges and L. Downward  Phys. Rev. B 70, 140201-1-4 (2004).  PDF
    2. "Investigation of ferromagnetic filled skutterudite compounds EuT 4Sb 12 (T = Fe, Ru, os)".  E. D. Bauer, A. Slebarski, N. A. Frederick, W. M. Yuhasz, M. B. Maple, D. Cao, F. Bridges, G. Giester, and P. Rogl   Journal of Physics-Condensed Matter 16, 5095-107 (2004).  PDF
    3. "Evidence for a universal relationship between magnetization and changes in the local structure".  L. Downward, F. Bridges, D. Cao, J. Neumeier, and L. Zhou   Int. J. of Mod. Phys. B 17, 3726-8 (2003).  PDF
    4. "Correlated atomic motions in the negative thermal expansion material ZrW2O8: a local structure study ".  D. Cao, F. Bridges, G. R. Kowach, and A. P. Ramirez   Phys. Rev. B 68, 14303-1-14 (2003).  PDF
    5. "X-ray-absorption spectroscopy study of the heavy-fermion superconductor PrOs4Sb12".  D. Cao, F. Bridges, S. Bushart, E. D. Bauer, and M. B. Maple   Phys. Rev. B 67, 180511-1-4 (2003).  PDF
    6. "Correlated local atomic displacements: the microscopic origins for macroscopic phenomena".  F. Bridges, D. Cao, and C. H. Booth   Application of Synchrotron Radiation Techniques to Materials Science VI. Symposium 678, EE7.1.1-10 (2002). 
    7. "Frustrated soft modes and negative thermal expansion in ZrW2O8".  D. Cao, F. Bridges, G. R. Kowach, and A. P. Ramirez   Phys. Rev. Lett. 89, 215902/1-4 (2002).  PDF
    8. "Changes of the local distortions and colossal magnetoresistive properties of La0.7Ca0.3MnO3 induced by Ti or Ga defects".  F. Bridges, D. Cao, M. Anderson, A. P. Ramirez, M. Olapinski, M. A. Subramanian, C. H. Booth, and G. Kwei   Gordon & Breach. Radiation Effects & Defects in Solids 155, 37-41 (2001).  PDF
    9. "Spin-lattice correlations and temperature dependent Mn K-edge structure in the La1-xCaxMnO3 systems".  F. Bridges, D. Cao, and M. Anderson   AIP Conf. Proc. 554, 384-90 (2001).  PDF
    10. "Local distortions in La0.7Ca0.3Mn1-bAbO3 (A=Ti and Ga) colossal magnetoresistance samples: Correlations with magnetization and evidence for cluster formation".  D. Cao, F. Bridges, M. Anderson, A. P. Ramirez, M. Olapinski, M. A. Subramanian, C. H. Booth, and G. H. Kwei   Phys. Rev. B 64, 184409/1-14 (2001).  PDF
    11. "Mn K-edge XANES studies of La1-xAxMnO3 systems (A=Ca, Ba, Pb)".  F. Bridges, C. H. Booth, M. Anderson, G. H. Kwei, J. J. Neumeier, J. Snyder, J. Mitchell, J. S. Gardner, and E. Brosha   Phys. Rev. B 63, 214405/1-14 (2001).  PDF
    12. "Magnetic-field modulation experiments on colossal magnetoresistance samples: first results ".  F. Bridges, G. Brown, D. Cao, and M. Anderson   Journal of Synchrotron Radiation 8, 366-8 (2001). 
    13. "Changes in the local structure of a La0.70Ca0.30MnO3 CMR sample induced by a magnetic field".  D. Cao, F. Bridges, C. H. Booth, and J. J. Neumeier   Phys. Rev. B 62, 8954-8 (2000).  PDF
    14. "Local lattice disorder in the geometrically frustrated spin-glass pyrochlore Y2Mo2O 7".  C. H. Booth, J. S. Gardner, G. H. Kwei, R. H. Heffner, F. Bridges, and M. A. Subramanian   Phys. Rev. B 62 R755-8 (2000).  PDF
    15. "Effect of annealing temperature on local distortion of La0.67Ca0.33MnO3 thin films".  D. Cao, F. Bridges, D. C. Worledge, C. H. Booth, and T. Geballe   Phys. Rev. B 61, 11373-8 (2000).  PDF
    16. "Temperature dependent changes of the Mn 3d and 4p bands near Tc in colossal magnetoresistance systems: XANES study of La1-xCaxMnO3 .  F. Bridges, C. H. Booth, G. H. Kwei, J. J. Neumeier, and G. A. Sawatzky   Phys. Rev. B 61, R9237-40 (2000).  PDF
    17. "Possible Evidence of Interstitial Scattering Outside the Muffin-tin Radius in EXAFS Spectra".  Z. Kvitky, F. Bridges, G. van Dorssen.  Phys. Rev. B 64, 214108 (2001).  Postscript PDF
    18. "Correlated Local Atomic Displacements: The Microscopic Origins For Macroscopic Phenomena".  F. Bridges, D. Cao, and C. H. Booth   Mat. Res. Soc. Symp. Proc., 678, EE7.1.1 (2001).  Postscript PDF
    19. "Mn K-edge XANES studies of La1-xAxMnO3 systems (A = Ca, Ba, Pb)".  F. Bridges, C. H. Booth, M. Anderson, G. H. Kwei, J. J. Neumeier, J. Snyder, J. Mitchell, J. S. Gardner, and E. Brosha   Phys. Rev. B 63, 214405 (2001).  Postscript PDF
    20. "The effect of the annealing temperature of the local distortion fo La0.67Ca0.33MnO3 thin films".  D. Cao, F. Bridges, D. C. Worledge, C. H. Booth, T. Geballe   Phys. Rev. B.  Postscript PDF
    21. "Magnetic-feld Modulation Experiments on Colossal Magnetoresistance samples: First results".  F. Bridges, G. Brown, D. Cao, and M. Anderson   J. Synchrotron Rad. 8, pt 2 (2000).  Postscript PDF
    22. "Temperature dependent changes of the Mn 3d and 4p bands near Tc in Colossal Magnetoresistance systems: a XANES study of La1-xCaxMnO3",  F. Bridges, C. H. Booth, G. H. Kwei, J. J. Neumeier, and G. A. Sawatzky   Phys Rev. B. 61, R9237 (2000).  Postscript PDF
    23. "Lattice Effects in LCMO: distortions, charge distribution and magnetism".  C. H. Booth, F. Bridges, G. H. Kwei, J. M. Lawrence, A. L. Cornelius, and J. J. Neumeier   Phys. Rev. B. 57, 10440 (1998).   PDF
    24. "Direct Relationship between magnetism and MnO6 distortions in La(1-x)CaxMnO3".  C. H. Booth, F. Bridges, G. H. Kwei, J. M. Lawrence, A. L. Cornelius, and J. J. Neumeier   Phys. Rev. Lett. 80, 853 (1998).  PDF
    25. "CeO2 compatibility with YBa2Cu3O7-δ in superconducting-film multilayers".  Y. A. Boikov, T. Claeson, D. Erts, F. Bridges, and Z. Kvitky   Phys. Rev. B. 56, 11312 (1997).  PDF
    26. "The Sticking properties of water frost produced under various ambient conditions".  K. D. Supulver, F. Bridges, S. Tiscareno, J. Lievore, and D. N. C. Lin   Icarus 129, 539-554 (1997). PDF
    27. "Energy loss and sticking mechanisms in particle aggregation in planetesimal formation".  F. Bridges, K. D. Supulver, D. N. C. Lin, R. Knight, and M. Zafra   Icarus 123, 422-435 (1996). PDF
    28. "XAFS Measurements of Negatively Correlated Atomic Displacements in HgBa2CuO4 + δ".  F. Bridges et al.   Phys. Rev. B., (Rapid Communications), 52, R15745 (1995).  PDF
    29. "XAFS Standards: A Comparison of Experiment and Theory".  G. G. Li, F. Bridges, and C.H. Booth   Phys. Rev. B. 52, 6332 (1995).  PDF
    30. "The Coefficient of Restitution of Ice Particles in Glancing Collisions: Experimental Results for Unfrosted Surfaces".  K. D. Supulver, F. G. Bridges, and D.N.C. Lin   Icarus 113, 188-199 (1995).  PDF
    31. "Correlated Local Distortions of the T10 Layers in T12Ba2CuOy: An x-ray absorption study".  G. G. Li, F. Bridges, J. B. Boyce, T. Claeson, C. Strom, S.-G. Eriksson, and S. D. Conradson   Phys. Rev. B 51, 8564 (1995).  PDF
    32. "Monochromator-induced Glitches in EXAFS Data: II. The Test of the model for a pinhole sample".  G. G. Li, F. Bridges, and X. Wang   Nucl. Instr. & Meth. A 340, 420 (1994). PDF
    33. "Microwave spectroscopy of the KCl:Li+ system: The Standard Model".  X. Wang and F. Bridges   Phys. Rev. B 46, 5122 (1992).  PDF
    34. "The Spectroscopy of Crystal Defects: a compendium of defect nomenclature".  F. Bridges, G. Davies, J. Robertson, and A.M. Stoneham   J. Phys. Cond. Mat. 2, 2875 (1990). PDF

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    Last modified: August 17, 2005