Zobrazeno 1 - 10
of 302
pro vyhledávání: '"C. Stassis"'
Publikováno v:
Journal of Solid State Chemistry. 183:114-119
The syntheses of the title compounds are described in detail. Structural characterizations from refinements of single crystal X-ray diffraction data for Yb{sub 5}Bi{sub 3}H{sub x} and Sm{sub 5}Bi{sub 3}H{sub 1} and of powder neutron diffraction data
Autor:
Alan I. Goldman, C. Stassis, Stephen M. Shapiro, P. C. Canfield, Jerel L. Zarestky, Gen Shirane
Publikováno v:
Journal of Physics and Chemistry of Solids. 63:811-814
The temperature dependence of the Δ 4 acoustic and optic mode, measured at q =(0.5,0,0) in LuNi 2 B 2 C, YNi 2 B 2 C were extended to 1000 K and new measurements on the mixed compound, Y 0.5 Lu 0.5 Ni 2 B 2 C, were undertaken to explore the mode cou
Autor:
Alan I. Goldman, C. Stassis, Ian R. Fisher, Paul C. Canfield, Zahirul Islam, Jerel L. Zarestky, Matthew J. Kramer
Publikováno v:
Journal of Alloys and Compounds. :223-227
Large (up to 0.5 cm3) single grains of icosahedral R–Mg–Zn quasicrystals (R=Y, Tb, Dy, Ho and Er) have been grown via a self-flux technique. The samples have a composition of approximately R9Mg34Zn57, and are extremely well-ordered, with little o
Autor:
C. Stassis, H. F. Fong, Yasuo Endoh, G. H. Lander, H. Matsushita, Charles F. Majkrzak, S. K. Sinha, Kazuyoshi Yamada, Seunghun Lee, S-W. Cheong, H. Kawano, P. J. Brown
Publikováno v:
Physical Review B. 60:10405-10417
Polarized neutron-diffraction experiments have been performed in search of the orbital magnetic moments recently predicted in a theory for the cuprate metals. Both La{sub 2{minus}x}Sr{sub x}CuO{sub 4} [LSCO(x)] and YBa{sub 2}Cu{sub 3}O{sub 6+x} [YBCO
Autor:
Stephen M. Shapiro, Gen Shirane, Jerel L. Zarestky, Alan I. Goldman, C. Stassis, P. C. Canfield
Publikováno v:
Physica C: Superconductivity. :127-133
The phonons that exhibit anomalous temperature dependence in these compounds have wave vectors close to ξ → m =(ξ,0,0) , with ξ ≅0.5, and belong to two Δ 4 [ ξ 00] branches (one acoustic and the other optic) which cannot cross by symmetry. T
Publikováno v:
Physical Review B. 59:9239-9242
The low-lying phonon dispersion curves of a D0{sub 3} ordered Cu{sub 3}Al(+Be) shape-memory alloy were measured, at room temperature, along the [{xi}00], [{xi}{xi}0], [{xi}{xi}{xi}], [{xi}{xi}1], and [ (1) /(2) , (1) /(2) , {xi}] symmetry directions.
Autor:
Alan I. Goldman, C. Stassis, Jerel L. Zarestky, Paul C. Canfield, Zahirul Islam, Ian R. Fisher
Publikováno v:
Physical Review B. 57:R11047-R11050
We present results of a study of possible magnetic ordering in the icosahedral phase of Tb-Mg-Zn probed by bulk magnetization measurements and neutron diffraction. Measurements on both crushed single grains and cast polycrystalline samples of Tb-Mg-Z
Autor:
M. Bullock, P. C. Canfield, Alan I. Goldman, Stephen M. Shapiro, Zentaro Honda, Jerel L. Zarestky, C. Stassis, Gen Shirane
Publikováno v:
Physical Review B. 57:7916-7921
Inelastic neutron-scattering techniques have been used to study the low-energy phonon excitations in superconducting $R{\mathrm{Ni}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ ($R=\mathrm{Lu},$ Y) to further characterize the anomalous features observed by Kawano
Autor:
Eduard Obradó, Antoni Planes, Alberto Somoza, Alfons Gonzàlez-Comas, Ricardo Romero, M. Morin, Jerel L. Zarestky, Lluís Mañosa, C. Stassis, Mariàngels Jurado
Publikováno v:
Acta Materialia. 46:1045-1053
This paper reports a comparative investigation of the effect of quenching on the Cu–Al–Be and Cu–Zn–Al shape memory alloys by the use of several experimental techniques. In a first stage, the order–disorder transitions in these alloys have
Autor:
C. Stassis, P. C. Canfield, M. Bullock, Jerel L. Zarestky, Gen Shirane, Alan I. Goldman, Stephen M. Shapiro
Publikováno v:
Physica B: Condensed Matter. :798-801
The authors studied the low-energy phonon excitations for wavevectors close to the Fermi surface nesting vector {rvec {xi}}{sub m} {approx_equal} 0.55{rvec a}. They find that above T{sub c} the frequencies of the {Delta}{sub 4} [{zeta}00] lowest-lyin