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- National Institute of Standards and TechnologyUS801 papers
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29 papers · 1 filter
Enhancement of long-range magnetic order by magnetic field in superconducting La2CuO(4+y)
B. Khaykovich, Y. S. Lee, R. Erwin +5
We report a detailed study, using neutron scattering, transport and magnetization measurements, of the interplay between superconducting (SC) and spin density wave (SDW) order in L…
Ferroelectric Ordering in the Relaxor Pb(Mg1/3Nb2/3)O3 as Evidenced by Low-Temperature Phonon Anomalies
S. Wakimoto, C. Stock, R. J. Birgeneau +5
Neutron scattering measurements of the lowest-energy TO phonons in the relaxor Pb(Mg1/3Nb2/3)O3 (PMN) are reported for 10<=T<=750 K. The soft mode, which is overdamped by the polar…
Er2Ti2O7: Evidence of Order by Disorder in a Frustrated Antiferromagnet
J. D. M. Champion, M. J. Harris, P. C. W. Holdsworth +14
Er_2Ti_2O_7 has been suggested to be a realization of the frustrated < 111 > XY pyrochlore lattice antiferromagnet, for which theory predicts fluctuation-induced symmetry breaking…
High Pressure Thermoelasticity of Body-centered Cubic Tantalum
O. Gulseren, R. E. Cohen
We have investigated the thermoelasticity of body-centered cubic (bcc) tantalum from first principles by using the linearized augmented plane wave (LAPW) and mixed--basis pseudopot…
Carbon Concentration Dependence of the Superconducting Transition Temperature and Structure of MgCxNi3
T. G. Amos, Q. Huang, J. W. Lynn +2
The crystal structure of the superconductor MgCxNi3 is reported as a function of carbon concentration determined by powder neutron diffraction. The single-phase perovskite structur…
Anomalous transverse acoustic phonon broadening in the relaxor ferroelectric Pb(Mg_1/3Nb_2/3)O_3
T. -Y. Koo, P. M. Gehring, G. Shirane +3
The intrinsic linewidth of the transverse acoustic (TA) phonon observed in the relaxor ferroelectric compound Pb(MgNbTiO (PMN-20%PT) beg…