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Shuji Ebisu,Yuji Ushiki,Shin Takahashi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Specific-heat measurements in magnetic fields have been performed on α-Dy2S3 single crystalsand have shown successive magnetic transitions at TN1 = 11.4 K and TN2 = 6.4 K. The specific heatin no magnetic field exhibits sharp peaks at both TN1 and TN2 . The change in the magnetic entropyacross each transition is estimated as Rln2/2 per mol-Dy, which suggests magnetic moments ononly one Dy site between two crystallographically inequivalent Dy sites order at each transitiontemperature. When the magnetic field is applied along the b-axis of the orthorhombic system, thetwo peaks of the specific heat shift toward lower temperatures. On the other hand, a magnetic fieldperpendicular to the b-axis shifts the peaks toward higher temperatures. The TN1 shifts to 9.6 K(H k b) and 12.5 K (H ⊥ b) under a magnetic field of 2 T. The TN2 peak broadens gradually withincreasing magnetic field for each direction; consequently, the peak is obscure under a field of 2 T.
Fixed target single-shot imaging of nanostructures using thin solid membranes at SACLA
Nam, Daewoong,Kim, Chan,Kim, Yoonhee,Ebisu, Tomio,Gallagher-Jones, Marcus,Park, Jaehyun,Kim, Sunam,Kim, Sangsoo,Tono, Kensuke,Noh, Do Young,Yabashi, Makina,Ishikawa, Tetsuya,Song, Changyong IOP 2016 Journal of Physics B: Atomic, Molecular and Optica Vol.49 No.3
<P>Single-shot imaging using femtosecond x-ray pulses from x-ray free electron lasers (XFELs) has revealed high-resolution structures of Au nanoparticles and biological macromolecular complexes. The x-ray pulse power of 10 GW is enough to vaporize specimen when it is focused on a few microns area. This makes it essential to have a single particle loader to provide fresh samples to the x-ray pulses. In this paper we introduce single-shot imaging at Spring-8 Angstrom Compact Free Electron Laser (SACLA) to investigate various types of specimen, from metallic nanoparticles to biological macromolecules, prepared on Si<SUB>3</SUB>N<SUB>4</SUB> membrane. A significant reduction in sample consumption is achieved while maintaining a data acquisition rate of 30 Hz, which is compatible with the current SACLA operation rate.</P>