Bulletin of the American Physical Society
18th Biennial Intl. Conference of the APS Topical Group on Shock Compression of Condensed Matter held in conjunction with the 24th Biennial Intl. Conference of the Intl. Association for the Advancement of High Pressure Science and Technology (AIRAPT)
Volume 58, Number 7
Sunday–Friday, July 7–12, 2013; Seattle, Washington
Session V3: NT.1 Novel Techniques: Diamond Anvil Cells II |
Hide Abstracts |
Chair: Jon Eggert, Lawrence Livermore National Laboratory Room: Fifith Avenue |
Thursday, July 11, 2013 1:45PM - 2:00PM |
V3.00001: Confocal microscopy of fluids under static pressure Matthew McCluskey There are few reliable methods for obtaining equations of state for fluids under static pressure. We are developing \textit{confocal microscopy} to investigate fluids in a diamond-anvil cell. Unlike conventional optical microscopy, confocal microscopes collect data point-by-point, enabling three-dimensional image reconstruction. By combining these images with Fabry-Perot interference measurements, we determine the volume and refractive index, as a function of pressure, in the same experiment. [Preview Abstract] |
Thursday, July 11, 2013 2:00PM - 2:15PM |
V3.00002: Pressure Generation Using Micro Size Nano-Polycrystalline Diamond Anvil Takehiko Yagi, Takeshi Sakai, Tetsuo Irifune, Yuya Suzuki, Yasushi Kuroda Since the first report of static high-pressure generation above mega bar using diamond anvil (Mao and Bell, 1978), further extension of pressure range was achieved mainly by the reduction of culet size. Nowadays it became possible to do experiments at the condition corresponding to the center of the Earth, that is above 350 GPa, using diamond anvils with a culet size of less than 50 microns. Dubrovisky et al. (2012) reported a generation of pressure above 600 GPa using micro-ball nanodiamond anvils, which were synthesized from grassy carbon in the multi-anvil high-pressure and high-temperature apparatus. Here we report the trial to achieve very high pressures using micro size nano-polycrystalline diamond anvils, which were fabricated using Focused Ion Beam (FIB) technique. This technique allows us to make micro-size diamond anvil with a culet size of 3 microns precisely from the nano-polycrystalline diamond, which was invented at Ehime University, and is believed to be one of the hardest materials so far known. The micro-anvils were placed at the center of ordinary diamond anvils with a culet size of 300 micron and compressed in the pressure transmitting media which applies confining pressure to the micro-anvils. The detail of experiments will be reported. [Preview Abstract] |
Thursday, July 11, 2013 2:15PM - 2:45PM |
V3.00003: Measuring the structure factor of simple fluids under extreme conditions Invited Speaker: Gunnar Weck The structure and dynamics of fluids, although a long standing matter of investigations, is still far from being well established. In particular, with the existence of a first order liquid-liquid phase transition (LLT) discovered in liquid phosphorus at 0.9 GPa and 1300 K [1] it is now recognized that the fluid state could present complex structural changes. At present, very few examples of LLTs have been clearly evidenced, which may mean that a larger range of densities must be probed. First order transitions between a molecular and a polymeric liquid have been recently predicted by first principles calculations in liquid nitrogen at 88 GPa and 2000 K [2] and in liquid CO$_{2}$ at 45 GPa and 1850 K[3]. The only device capable of reaching these extreme conditions is the diamond anvil cell (DAC), in which, the sample is sandwiched between two diamond anvils of thickness 100 times larger. Consequently, the diffracted signal from the sample is very weak compared to the Compton signal of the anvils, and becomes hardly measurable for pressures above $\sim$20 GPa. A similar problem has been faced by the high pressure community using large volume press so as to drastically reduce the x-ray background from the sample environment. In the angle-dispersive diffraction configuration, it was proposed to use a multichannel collimator (MCC) [4]. This solution has been implemented to fit the constraints of the Paris-Edimburg (PE) large volume press and it is now routinely used on beamline ID27 of the European Synchrotron Radiation Facility [5,6]. In this contribution, we present our adaptation of the MCC device accessible at ID27 for the DAC experiment. Because of the small sample volume a careful alignment procedure between the MCC slits and the DAC had to be implemented. The data analysis procedure initially developed by Eggert et al. [7] has also been completed in order to take into account the complex contribution of the MCC slits. A large reduction of the Compton diffusion from the diamond anvils is obtained enabling quantitative structure factor measurement, even for the weakest x-ray scatterer liquid. Experimental results on fluid hydrogen will be presented to test the limits of this new setup. In collaboration with Gaston Garbarino, ESRF, France; Frederic Datchi, Sandra Ninet, Universit\'e Pierre et Marie Curie-Paris VI, France; Dylan Spaulding, Paul Loubeyre, CEA, DAM, DIF, France; and Mohamed Mezouar, ESRF, France. \\[4pt] [1] Y. Katayama et al. Nature 403, 170 (2000).\\[0pt] [2] B. Boates and S. A. Bonev. Phys. Rev. Lett. 102, 015701, (2009).\\[0pt] [3] B. Boates el al. Proc. Natl. Acad. Sci. 107, 12799, (2010).\\[0pt] [4] K. Yaoita et al. Rev. Sci. Ins 68, 2106 (1997)\\[0pt] [5] M. Mezouar et al. Rev. Sci. Ins. 73, 3570 (2002)\\[0pt] [6] G. Morard et al. Rev. Sci. Ins. 82, 023904, (2011)\\[0pt] [7] J. H. Eggert et al. Phys. Rev. B 65 174105 (2002) [Preview Abstract] |
Thursday, July 11, 2013 2:45PM - 3:00PM |
V3.00004: ABSTRACT WITHDRAWN |
Thursday, July 11, 2013 3:00PM - 3:15PM |
V3.00005: HIgh pressure magnetic measurements on strongly correlated electron systems with miniature ceramic anvil high pressure cell Naoyuki Tateiwa, Yoshinori Haga, Tatsuma Matsuda, Etsuji Yamamoto, Zachary Fisk We have designed a miniature ceramic anvil high pressure cell (mCAC) for magnetic measurements at pressures up to 12.6 GPa in a commercial superconducting quantum interference (SQUID) magnetometer [N. Tateiwa \textit{et al.}, Rev. Sci. Instrum. \textbf{82}, 053906 (2011)., ibid. \textbf{83}, 053906 (2012)]. The simplified mCAC without anvil alignment mechanism is easy-to-use for researchers who are not familiar with high-pressure technology. The production cost is about one tenth of that of the diamond anvil cell (DAC). Recently, the background magnetization in the mCAC was significantly reduced, enabling more precise magnetic measurements at low temperatures. In this conference, we will shows our recent modifications in the mCAC and experimental results on rare earth compound YbCu$_2$Si$_2$. YbCu$_2$Si$_2$ is a paramagnetic compound at ambient pressure. The pressure-induced phase has been suggested above 8 GPa by previous studies with the ac magnetic susceptibility and the heat capacity measurements. We confirm the spontaneous dc magnetization in the pressure-induced ferromagnetic phase by the dc magnetic measurement. We have studied the anisotropy in the magnetic property in the pressure-induced phase around 11 GPa and found that the phase has the strong Ising-type uniaxial anisotropy. [Preview Abstract] |
Thursday, July 11, 2013 3:15PM - 3:45PM |
V3.00006: Designer Diamonds: Applications in Iron-based Superconductors and Lanthanides Invited Speaker: Yogesh Vohra This talk will focus on the recent progress in the fabrication of designer diamond anvils as well as scientific applications of these diamonds in static high pressure research. The two critical parameters that have emerged in the microwave plasma chemical vapor deposition of designer diamond anvils are (1) the precise [100] alignment of the starting diamond substrate and (2) balancing the competing roles of parts per million levels of nitrogen and oxygen in the diamond growth plasma. The control of these parameters results in the fabrication of high quality designer diamonds with culet size in excess of 300 microns in diameter. The three different applications of designer diamond anvils will be discussed (1) simultaneous electrical resistance and crystal structure measurements using a synchrotron source on Iron-based superconductors with data on both electron and hole doped BaFe$_{2}$As$_{2}$ materials and other novel superconducting materials (2) high-pressure high-temperature melting studies on metals using eight-probe Ohmic heating designer diamonds and (3) high pressure low temperature studies on magnetic behavior of 4f-lanthanide metals using four-probe electrical resistance measurements and complementary neutron diffraction studies on a spallation neutron source. Future opportunities in boron-doped conducting designer diamond anvils as well as fabrication of two-stage designer diamonds for ultra high pressure experiments will also be presented. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700