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Full-Text Articles in Physics

Temperature And Magnetic-Field Dependence Of The Elastic Constants Of Ni-Mn-Al Magnetic Heusler Alloys, Xavier Moya, Lluís Mañosa, Antoni Planes, Thorsten Krenke, Mehmet Acet, Michel Morin, Jerel L. Zarestky, Thomas A. Lograsso Jul 2006

Temperature And Magnetic-Field Dependence Of The Elastic Constants Of Ni-Mn-Al Magnetic Heusler Alloys, Xavier Moya, Lluís Mañosa, Antoni Planes, Thorsten Krenke, Mehmet Acet, Michel Morin, Jerel L. Zarestky, Thomas A. Lograsso

Ames Laboratory Publications

We report on measurements of the adiabatic second-order elastic constants of the off-stoichiometric Ni54Mn23Al23 single-crystalline Heusler alloy. The variation in the temperature dependence of the elastic constants has been investigated across the magnetic transition and over a broad temperature range. Anomalies in the temperature behavior of the elastic constants have been found in the vicinity of the magnetic phase transition. Measurements under applied magnetic field, both isothermal and variable temperature, show that the value of the elastic constants depends on magnetic order, thus giving evidence for magnetoelastic coupling in this alloy system.


Search For Multi-Photon Signatures Of A Higgs Boson In Ppbar Collisions At Sqrt(S) = 1.96 Tev , Oleksiy Vladimirovich Atramentov Jan 2006

Search For Multi-Photon Signatures Of A Higgs Boson In Ppbar Collisions At Sqrt(S) = 1.96 Tev , Oleksiy Vladimirovich Atramentov

Retrospective Theses and Dissertations

We have performed a search for a fermiophobic Higgs boson in tri-photon events. The study has been performed on 0.83 fb-1 of data collected with the DZero detector at the Tevatron collider, the world's highest energy accelerator. The study was motivated by the recent phenomenological study that suggests that at presently attained energies and statistics new Higgs production mechanisms become experimentally accessible. All backgrounds were estimated from the data in a self consistent manner. We observed zero tri-photon events and expected 0.5 +/- 0.2 from the Standard Model processes. Therefore, we set 95% CL upper limit on ...