A529 Physics
Iowa State University
Ames, Iowa 50011


Phone: (515) 294-4224
Fax: (515) 294-0689
Email: stassis@ameslab.gov

Ph. D. 1970, Massachusetts Institute of Technology; Research Associate, Physics Department, MIT 1970-71; Iowa State University/Ames Laboratory, 1971-present.

RESEARCH INTERESTS

Neutron diffraction from magnetic crystals; polarized neutron investigation of spin densities in metals; spin waves in metals; lattice dynamics.

SELECTED PUBLICATIONS

M. Bullock, J. Zarestky, C. Stassis, A. Goldman, P. Canfield, Z. Honda. G. Shirane, S.M. Shapiro, “Low Energy Phonon Excitations in Superconducting RENi₂B₂C (RE=Lu,Y),” Phys. Rev. B 57, 7916 (1998).

M. Bullock, C. Stassis, J. Zarestky, A. I. Goldman, P. Canfield, G. Shirane, S. Shapiro, “Inelastic Neutron Scattering Studies of the Low-Energy Phonon Excitations in the RENi₂B₂C Superconductors,” Physica B 241-243, 798 (1998).

Ll. Mañosa, M. Jurado, A. Gonzáles-Comas, E. Obradó, A. Planes, J. Zarestky, C. Stassis,
R. Romero, A. Somoza, M. Morin, “A Comparative Study of the Post-Quench Behavior of Cu-Al-Be and Cu-Zn-Al Shape Memory Alloys,” Acta Mater. 46, 1045 (1998).

Z. Islam, I. R. Fisher, Z. Zarestky, P. Canfield, C. Stassis, A. I. Goldman, “A Reinvestigation of Long-Range Magnetic Ordering in Icosahedral Tb-Mg-Zn,” Phys. Rev. B 57, R11047 (1998).

Ll. Mañosa, J. Zarestky, M. Bullock, C. Stassis, “Low Lying Phonon Dispersion Curves of Cu₃Al(+Be),”Phys. Rev. B 59, 9239 (1999).

C. Stassis, J. Zarestky, A. Goldman, P. Canfield, G. Shirane, S. Shapiro, “Anomalous Phonons Below T_c in Superconducting RNi₂B₂C (R = Lu, Y), Physica C 317-318, 127 (1999).

J. Zarestky, C. Stassis, A. Goldman, P. Canfield, G. Shirane, S. Shapiro, “Phonon Profiles in Superconducting Yni₂B₂C and LuNi₂B₂C,” Phys. Rev. B 60, 11932 (1999).

S. H. Lee, C. F. Majkwzak, S. K. Sinha, C. Stassis, H. Kawano, G. Lander, P. Brown, H. F. Fong, S. W. Cheong, H. Matsushita, K. Yamada, Y. Endoh, “Search for Orbital Moments in Underdoped Cuprate Metals – A Sisyphian Experience,” Phys. Rev. B 60, 10405 (1999).

C. Stassis, “Techniques for the Study of Phonons,“ Section 14.7 in Methods of Materials Research, John Wiley and Sons, Inc. (2000).

I.R. Fisher, Z. Islam, J. Zarestky, C. Stassis, M.J. Kramer, A.I. Goldman and P.C. Canfield, “ Magnetic Properties of Isosehedral R-Mg-Zn Quasicrystal (R=Y. Tb. Dy. Ho and Er),” J. Alloys Compd. 303-304, 223 (2000)

C. Stassis, “Inelastic Neutron Scattering,” in Handbook of Elastic Properties of Solids Academic Press (New York, NY) (2001).

Ll. Mañosa, Antonio Planes, J. Zarestky, T. Lograsso, D.L. Schlagel, C. Stassis “Phonon Softening in Ni-Mn-Ga Alloys,” Phys. Rev. B (in press).

S.M. Shapiro, J. Zarestsky, P. Canfield, A. Goldman, C. Shirane, C. Stassis, “ Phonon  Anomalies in the (Lu _0.5Y_0.5) Bi₂ B₂ C Mixed Superconductivity Compound” Z. Phys. B (accepted).

C. Stassis, Neutron Scattering
in Handbook of Elastic Constants, Pergamon Press, (in press).

C. Stassis, Techniques for the study of phonons, Section 14.7 in Methods of Materials Research, John Wiley and Sons, Inc. (2000).

Ll. Mañosa, J. Zarestky, M. Bullock, and C. Stassis, Low lying phonon dispersion curves of Cu3Al(+Be), Phys. Rev. B 59, 9239 (1999).

C. Stassis, J. Zarestky, A. Goldman, P. Canfield, G. Shirane, and S. Shapiro, Anomalous honons below Tc in superconducting RNi2B2C (R = Lu, Y), Physica C 317-318, 127 (1999).

J. Zarestky, C. Stassis, A. Goldman, P. Canfield, G. Shirane, and S. Shapiro, Phonon profiles in superconducting YNi2B2C and LuNi2B2C,
Phys. Rev. B 60, 11932 (1999).

S. H. Lee, C. F. Majkwzak, S. K. Sinha, C. Stassis, H. Kawano, G. Lander, P. Brown, H. F. Fong,
S. W. Cheong, H. Matsushita, K. Yamada, and Y. Endoh Search for orbital moments in underdoped cuprate metals - A Sisyphian experience, Phys. Rev. B 60, 10405 (1999).


D. C. Johnston, F. Borsa, B. K. Cho, P. C. Canfiled, P. Dervenagas, A. I. Goldman, B. N. Harmon, L. L. Miller, C. Stassis, B. J. Suh, D. R. Torgeson, M. Xu, J. Zarestky, M. F. Hundley, R. Movshovitz, J. D. Thompson, A. V. Chubukov, B. Sternlieb, Superconducting and Normal State Magnetic Properties of RNi₂B₂C Single Crystals, Chinese J. Phys.,34, 397 (1996).

C. Stassis, A. I. Goldman, P. Dervenagas, J. Zarestky, P. C. Canfield, B. K. Cho, D. C. Johnston, B. Sternlieb
Magnetic Structures in RNi₂B₂C (R=Ho, Er) Superconductors in Materials Research Society Symposium Proceedings, Neutron Scattering in Materials Science II, (D. A. Neumann, T. P. Russell, B. J. Wuensch), editors. 376, 559 (1996).



P. Dervenagas, J. Zarestky, C. Stassis, A. I. Goldman, P. Canfield, B. K. Cho, Magnetic structure of TbNi₂B₂C, Phys. Rev. B 53, 3487 (1996).



J. P. Hill, C. Detlefs, B. Sternlieb, D. Gibbs, A. I. Goldman, C. Stassis, B. K. Cho, P. C. Canfield, Incommensurate antiferromagnetism in the intermetallic superconductor HoNi₂B₂C, Phys. Rev. B 53, 3487 (1996).



C. Detlefs, A. I. Goldman, J. P. Hill, D. Gibbs, C. Stassis, P. C. Canfield, B. K. Cho, The magnetic structure of GdNi₂B₂C by resonant and non-resonant x-ray scattering, Phys. Rev. B 53, 6355 (1996).



U. Yaron, P. L. Gammel, A. P. Ramirez, D. A. Huse, D. J. Bishop, A. I. Goldman, C.Stassis, P. C. Canfield, K., Mortenson, M. R. Eskildsen
Observation of a square flux-line lattice in the magnetic superconductor ErNi₂B₂C, Nature 382, 236 (1996).



C. Stassis, A. I. Goldman, Neutron and x-ray scattering studies of RNi₂B₂C (R=rare earth) single crystals, J. of Alloy and Comp. (in press).