Now showing items 1-9 of 9

    • Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3Sb7-xTex 

      Abernathy, Douglas L; Bansal, Dipanshu; Delaire, Olivier; Li, CW; Said, AH; Yan, J (Physical Review B - Condensed Matter and Materials Physics, 2015-12-07)
      © 2015 American Physical Society.Phonon properties of Mo3Sb7-xTex (x=0,1.5,1.7), a potential high-temperature thermoelectric material, have been studied with inelastic neutron and x-ray scattering, and with first-principles ...
    • Electronic Instability and Anharmonicity in SnSe 

      Delaire, Olivier; Hong, J
      The binary compound SnSe exhibits record high thermoelectric performance, largely because of its very low thermal conductivity. The origin of the strong phonon anharmonicity leading to the low thermal conductivity of SnSe ...
    • Itinerant Antiferromagnetism in RuO$_{2}$ 

      Berlijn, T; Snijders, PC; Delaire, Olivier; Zhou, H-D; Maier, TA; Cao, H-B; Chi, S-X; ... (12 authors) (PRL, 2017-02-23)
      Bulk rutile RuO$_2$ has long been considered a Pauli paramagnet. Here we report that RuO$_2$ exhibits a hitherto undetected lattice distortion below approximately 900 K. The distortion is accompanied by antiferromagnetic ...
    • Modeling non-harmonic behavior of materials from experimental inelastic neutron scattering and thermal expansion measurements. 

      Aref, A; Bansal, Dipanshu; Dargush, G; Delaire, Olivier (J Phys Condens Matter, 2016-09-28)
      Based on thermodynamic principles, we derive expressions quantifying the non-harmonic vibrational behavior of materials, which are rigorous yet easily evaluated from experimentally available data for the thermal expansion ...
    • Momentum-resolved observations of the phonon instability driving geometric improper ferroelectricity in yttrium manganite. 

      Abernathy, Douglas L; Bansal, Dipanshu; Chi, Songxue; Delaire, Olivier; Garlea, V Ovidiu; Niedziela, Jennifer L; Ren, Yang; ... (9 authors) (Nature communications, 2018-01-02)
      Magnetoelectrics offer tantalizing opportunities for devices coupling ferroelectricity and magnetism but remain difficult to realize. Breakthrough strategies could circumvent the mutually exclusive origins of magnetism and ...
    • Phonon anharmonicity and negative thermal expansion in SnSe 

      Abernathy, Douglas L; Bansal, Dipanshu; Delaire, Olivier; Hong, J; Hu, MY; Li, CW; May, AF; ... (8 authors) (Physical Review B - Condensed Matter and Materials Physics, 2016-08-09)
      © 2016 American Physical Society.The anharmonic phonon properties of SnSe in the Pnma phase were investigated with a combination of experiments and first-principles simulations. Using inelastic neutron scattering (INS) and ...
    • The origin of incipient ferroelectricity in lead telluride. 

      Bray, C; Chollet, M; Clark, J; Delaire, Olivier; Fahy, S; Glownia, JM; Henighan, T; ... (21 authors) (Nat Commun, 2016-07-22)
      The interactions between electrons and lattice vibrations are fundamental to materials behaviour. In the case of group IV-VI, V and related materials, these interactions are strong, and the materials exist near electronic ...
    • Thermoelectric transport properties of CaMg 2Bi 2, EuMg 2Bi 2, and YbMg 2Bi 2 

      Cai, Wei; Delaire, Olivier; Huq, A; Ma, J; May, AF; McGuire, MA; Singh, DJ; ... (8 authors) (Physical Review B - Condensed Matter and Materials Physics, 2012-01-11)
      The thermoelectric transport properties of CaMg 2Bi 2, EuMg 2Bi 2, and YbMg 2Bi 2 were characterized between 2 and 650 K. As synthesized, the polycrystalline samples are found to have lower p-type carrier concentrations ...
    • Weak coupling of pseudoacoustic phonons and magnon dynamics in the incommensurate spin-ladder compound S r14 C u24 O41 

      Abernathy, Douglas L; Aczel, AA; Bansal, Dipanshu; Chen, X; Delaire, Olivier; Shi, L; Sullivan, S; ... (8 authors) (Physical Review B - Condensed Matter and Materials Physics, 2016-10-21)
      © 2016 American Physical Society.Intriguing lattice dynamics have been predicted for aperiodic crystals that contain incommensurate substructures. Here we report inelastic neutron scattering measurements of phonon and magnon ...