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Selected Publications

  1. Elastic properties of the Zintl ferromagnet Yb14MnSb11, S. Bhattacharya, D.C. Marinescu, J.R. Morris, I.A. Sergienko, B.C. Sales, D. Mandrus, and V. Keppens, Physical Review B 86, 024402 (2012).
  2. Complex itinerant ferromagnetism in noncentrosymmetric Cr11Ge19, N. J. Ghimire, M. A. McGuire, D. S. Parker, B. C. Sales, J.-Q. Yan, V. Keppens, M. Koehler, R. M. Latture, and D. Mandrus, Physical Review B 85, 224405 (2012).
  3. Lattice dynamics and anomalous softening in the YbFe4Sb12 skutterudite, A. Möchel, I. Sergueev, H.C. Wille, J. Voigt, M. Prager, M.B. Stone, B.C. Sales, Z. Guguchia, A. Shengelaya, V. Keppens, and R.P. Hermann, Physical Review B 84, 184306 (2011).
  4. Structural and magnetic properties of Tb6Fe1-xCoxBi2 (x=0, 0.125, 0.25, 0.375) compounds, L. Jia, M. Koehler, D. McCarthy, M. McGuire and V. Keppens, Journal of Applied Physics 109, 07E331 (2011).
  5. Elastic moduli and magnetostriction of Tb6CoxFe1-x(Bi,Sb)2 (0 ≤ x ≤ 0.375), M. Koehler, L. Jia, D. McCarthy, and V. Keppens, Journal of Applied Physics 109, 07A918 (2011).
  6. Low temperature ultrasonic attenuation in phosphate glasses, V. Keppens, C. Laermans, B.C. Sales, and L.A. Boatner, Chinese journal of Physics 49, 369-374 (2011).
  7. Effects of Nematic Fluctuations on the elastic properties of Iron Arsenide superconductors, Rafael M. Fernandes, Lindsay H. VanBebber, Shobo Bhattacharya, Premala Chandra, Veerle Keppens, David Mandrus, Michael A. McGuire, Brian C. Sales, Athena S. Sefat, and Joerg Schmalian, Physical Review Letters 105, 157003 (2010).
  8. Electronic, magnetic and optical properties of two Fe-based superconductors and related parent compounds, R. Jin, M.H. Pan, X.B. He, G. Li, D. Li, R.-W. Peng, J. R. Thompson, B.C. Sales, A.S. Sefat, M.A. McGuire, D. Mandrus, J. F. Wendelken, V. Keppens, and E.W. Plummer, Superconductor Science and Technology 23, 054005 (2010).
  9. Resonant ultrasound studies of the layered perovskite system Ca2-xSrxRuO4, Yanbing Luan, Veerle Keppens, Ronying Jin, and David Mandrus, Journal of The Acoustical Society of America 126, 2949 (2009).
  10. Absence of superconductivity in hole-doped BaFe2-xCrxAs2 single crystals, A. S. Sefat, D. J. Singh, L. H. VanBebber, Y. Mozharivskyj, M. A. McGuire, R. Jin, B.C. Sales, V. Keppens, and D. Mandrus, Physical Review B  79, 224524 (2009)
  11. Elastic moduli of superhard rhenium diboride, M. Koehler, V. Keppens, R. Jin, B.C. Sales, and D. Mandrus, J. Phys. D: Appl. Phys. 42, 095414 (2009).
  12. Itinerant antiferromagnetism in BaCr2As2: Experimental characterization and electronic structure calculations, D. Singh, A. Sefat, M. McGuire, B.C. Sales, D. Mandrus, L. H. VanBebber, and V.Keppens, Phys. Rev. B. 79, 094429 (2009).
  13. Physical factors controlling the ductility of bulk metallic glasses, Y. Liu, H. Wu, C.T. Liu, Z. Zhang and V. Keppens, Appl. Phys. Lett. 93, 151915 (2008).
  14. Phase transitions in LaFeAsO: Structural, magnetic, elastic, and transport properties, heat capacity and Mössbauer spectra, Michael A. McGuire, Andrew D. Christianson, Athena S. Sefat, Brian C. Sales, Mark D. Lumsden, Rongying Jin, E. Andrew Payzant, David Mandrus, Yanbing Luan , Veerle Keppens, Vijayalaksmi Varadarajan, Joseph W. Brill, Raphaël P. Hermann, Moulay T. Sougrati and Fernande Grandjean, and Gary J. Long, Phys. Rev. B 78, 094517 (2008).
  15. Development and Characterization of Low-Density Ca-based Bulk Metallic Glasses: An overview, O.N. Senkov, D.B. Miracle, V. Keppens, and P. Liaw, Metallurgical and Materials Transactions 39A, 1888 (2008).
  16. A simple model to predict the temperature dependence of elastic moduli of bulk metallic glasses, Zhiying Zhang, Veerle Keppens, and Takeshi Egami, Journal of Applied Physics 102, 123508 (2007).
  17. Dumbbell Rattling in Thermoelectric Zinc Antimony, W. Schweika, R. P. Hermann, M. Prager, J. Perßon, and V. Keppens, Physical Review Letters 98, 15501 (2007).
  18. Glass transition in metallic glasses: A microscopic model of topological fluctuations in the bonding network, T. Egami, S. J. Poon, Z. Zhang, and V. Keppens, Physical Review B 76, 024203  (2007).
  19. Localized Einstein modes in Ca-based bulk metallic glasses,  V. Keppens, Z. Zhang, O.N. Senkov, and D.B. Miracle, Phil. Mag. 87, 503-508 (2007).
  20. Elastic properties of Ca-based bulk metallic glasses studied by resonant ultrasound spectroscopy, Z. Zhang,V. Keppens, O.N. Senkov, and D.B. Miracle, Materials Science and Engineering A 471, 151 (2007).
  21. Elastic properties of Zr-based bulk metallic glasses studied by resonant ultrasound spectroscopy, Z. Zhang, V. Keppens,  P. K. Liaw, Y. Yokoyama, and A. Inoue, J. Mat. Research 22, 364-367 (2007).
  22. Studying fatigue behavior and Poisson’s ratio of bulk metallic glasses, P.K. Liaw, G.Y. Wang, Y. Yokoyama, A. Peker, W.H. Peter, B. Yang, M. Freels, Z.Y. Zhang, V. Keppens, R. Hermann, R.A. Buchanan, C.T. Liu, and C.R. Brooks, Intermetallics 15, 663 (2007).
  23. The effect of disorder on the elastic and thermal transport properties in thermoelectric Zn4Sb3, S. Bhattacharya, R. P. Hermann, V. Keppens, T. M. Tritt, and G. J. Snyder, Physical Review B 74, 134108 (2006).
  24. Direct Experimental Evidence for Atomic Tunneling of Europium in Crystalline Eu8Ga16Ge30, R.P. Hermann, V. Keppens, P. Bonville, G.S. Nolas, F. Grandjean, G.J. Long, H.M. Christen, B.C. Chakoumakos, B.C. Sales, and D. Mandrus, Physical Review Letters 97, 017401 (2006).
  25. Magnetic and electronic properties of Eu4Sr4Ga16Ge30, G.T. Woods, J.  Martin, M.  Beekman, R.P. Hermann, F. Grandjean, V. Keppens, O. Leupold, G.J. Long, and G.S. Nolas, Physical Review B 73, 174403 (2006).
  26. Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7, C. A. Kendziora, I. Sergienko, R. Jin, J. He, V. Keppens, D. Mandrus, and B.C. Sales, Physical Review Letters 95, 125503 (2005).
  27. Four-well tunneling states and elastic response of clathrates,  I. Zerec, V. Keppens, M. McGuire, D. Mandrus, B. C. Sales, and P. Thalmeier, Physical Review Letters 92, 185502 (2004).
  28. Metallic “Ferroelectricity” in the Pyrochlore Cd2Re2O7 ,  I. A. Sergienko, V. Keppens, M. McGuire, R. Jin, J. He, S. H. Curnoe, B. C. Sales, P. Blaha, D. J. Singh, K. Schwarz, and D. Mandrus, Physical Review Letters 92, 065501 (2004).
  29. Single crystal elastic constants of Fe-15Ni-15Cr alloy, A. Teklu, H. Ledbetter, S. Kim , L.A Boatner, M. McGuire M, and V. Keppens  Metallurgical and materials transactions A 35A,  3149-3154 (2004).
  30. Long- and short-range magnetic order in the spinel Co2Ru1-xMnxO4, G. E. Granroth, D. mandrus, V. Keppens, and S.E. Nagler, Journal of Magnetism and Magnetic Materials 272-276, 1306-7 (2004).
  31.  Synthesis of iron-based bulk metallic glasses as nonferromagnetic amorphous steel alloys,  V. Ponnambalam, S. J. Poon, G. J. Shiflet, V. Keppens, R. Taylor, and G. Petculescu, Applied Physics Letters 83, 1131 (2003).
  32. Extraordinary Magnetoelasticity and Lattice Softening in b.c.c. Fe-Ga Alloys,A. E. Clark, K. B. Hathaway, M. Wun-Fogle, J. B. Restorff, T. A. Lograsso, V. M. Keppens, G. Petculescu, and R. A. Taylor, Journal of Applied Physics. 93, 8621-3 (2003).
  33. Glasslike excitations in single crystalline Sr8Ga16Ge30 clathrates, V. Keppens, M. McGuire, A. Teklu, C. Laermans, B. C. Sales, D. Mandrus, and B. C. Chakoumakos, Physica B316, 95 (2002).
  34. Ultrasound versus thermal conductivity in Ge clathrates, C. Laermans, M. A. Parshin, D. A. Parshin, and V. Keppens, Physica B 316, 273 (2002).
  35. Continuous metal-insulator transition in the pyrochlore Cd2Os2O7, D. Mandrus, J.R. Thompson, R. Gaal, L. Forro, J. C. Bryan, B.C. Chakoumakos, L.M. Woods, B.C. Sales, R. S. Fishman, and V. Keppens,  Physical Review B 63, 195104 (2001).
  36. Irradiation-induced amorphization of Cd2Nb2O7 pyrochlore, A. Meldrum, C. W. White, V. Keppens, L. A. Boatner, and R. C. Ewing, Physical Review B 63, 104109/1-11 (2001).
  37. When does a crystal conduct heat like a glass? V. Keppens, B. C. Sales, D. Mandrus, B. C. Chakoumakos, and C. Laermans, Philosophical Magazine Letters80, p807-812 (2000)
  38. Sound velocity and internal friction of neon films, J. Classen, V. Keppens, and S. Hunklinger, Physica B, 284-288, p 377-378 (2000).
  39. Disparate atomic displacements in skutterudite-type LaFe3CoSb12, a model for thermoelectric behavior, B. C. Chakoumakos, B. C. Sales, D. Mandrus, and V. Keppens, Acta Crystallographia B 55, 341-347 (1999).
  40. Spin glass formation in Co2RuO4, D. Mandrus, V. Keppens, and B. C. Chakoumakos, Materials Research Bulletin 34, 1013-1022 (1999).
  41. Direction dependence of the tunneling states-phonon coupling in neutron irradiated quartz, V. Keppens and C. Laermans, Physica B 263-264,  149 (1999).
  42. Localized vibrational modes in metallic solids, V. Keppens, D. Mandrus, B. C. Sales, B. C. Chakoumakos, P. Dai, R. Coldea, M. B. Maple, D. A. Gajewski, E. J. Freeman, and S. Bennington, Nature 395, 876 (1998).
  43. Unusual transport and large diamagnetism in the intermetallic semiconductor RuAl2, D. Mandrus, V. Keppens, B. C. Sales and J. L. Sarrao, Physical Review B 58, 3712 (1998).
  44. Filled skutterudite antimonides: electron-crystals and phonon-glasses? B. C. Sales, D. Mandrus, B. C. Chakoumakos, V. Keppens, and J. R. Thompson, Physical Review B 56, 15081-15089 (1997).
  45. Tunneling states in vitreous GeO2,C. Laermans, V. Keppens, and R. Weeks, Physical Review B 55, 2701-2704 (1997).
  46. Low temperature study of defective quartz, C. Laermans and V. Keppens, Czechoslovak Journal of Physics 46, 2229-2230 (1996).
  47. Further study of the distribution of the tunneling states in neutron-irradiated quartz, C. Laermans, and V. Keppens, Materials Science Forum 239-241, 15-18 (1996).
  48. Study of the influence of heat treatment on the tunneling states in neutron-irradiated quartz,  V. Keppens and C. Laermans, Physical Review B 53, 14849-15861 (1996).
  49. Ultrasonic attenuation measurements in neutron-irradiated z-cut quartz: a microscopic model for the tunneling states, V. Keppens, C. Laermans, and M. Coeck, Nuclear Instruments & Methods B 116, 211-515 (1996).
  50. Experimental evidence for rotated tetrahedra as tunneling states in neutron-irradiated quartz,  C. Laermans and V. Keppens, Physica B 220, 258-260 (1996).
  51. Ultrasonic attenuation measurements in neutron-irradiated quartz: the influence of heat treatment for a dose of 4.7×1019 n/cm2, V. Keppens and C. Laermans, Radiatiation Effect &. Defects in Solids 137, 169-172 (1995).
  52. Induced changes in the distribution of the tunneling states, V. Keppens and C. Laermans, Physical  Review B 51, 8602 (1995).
  53. Origin of the tunneling states in SiO2,  C. Laermans and V. Keppens, Physical Review B 51, 8158 (1995).
  54. Anisotropic tunneling states in neutron-irradiated quartz,  C. Laermans and V. Keppens, Journal of Non-Crystalline Solids 179, 135 (1994).
  55. Further measurements of positron-annihilation lifetimes in neutron-irradiated quartz,  C. Laermans, V. Keppens, A. Van den Bosch, L. Dorikens-Van Praet, D. Segers, and M. Dorikens, Nuclear Instruments & Methods B 91, 350 (1994).
  56. Ultrasonic study of the tunneling states in quartz amorphized by neutron-irradiation, V. Keppens and C. Laermans, Nuclear Instruments & Methods B 91, 346 (1994).
  57. Measurements of the ultrasonic attenuation and velocity variation in neutron-irradiated quartz for an intermediate dose of 2.6×1019 n/cm2, V. Keppens and C. Laermans, Nuclear Instruments & Methods B 65, 223 (1992).
  58. Ultrasonic measurements of the variation of the velocity of sound in electron-irradiated quartz: a quantitative analysis to the tunneling model, A. Vanelstraete, C. Laermans, and V. Keppens, Physica B 165&166, 901 (1990).
  59. Study of the tunneling states in neutron-irradiated quartz: a quantitative analysis of ultrasonic attenuation measurements after heat treatment, V. Keppens, A. Vanelstraete, and C. Laermans, Physica B 165&166, 899 (1990).

 

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