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 D2: CM.2 Phase Transitions: Quantum & Topological |
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Chair: Frank Cherne, Los Alamos National Laboratory Room: Grand Ballroom II |
Monday, July 8, 2013 1:45PM - 2:15PM |
D2.00001: Quantum Criticality and Superconductivity in Spin and Charge Systems Invited Speaker: Siddharth Saxena This talk will focus on experimental search and discovery of novel forms of quantum order in metallic and insulating magnets, intercalated compounds, ferroelectric systems and multi-ferroic materials. Particularly discussed will be the pressure-induced superconductivity and critical phenomena in the vicinity of quantum phase transitions. Materials tuned to the neighbourhood of a zero temperature phase transition often show the emergence of novel quantum phenomena. Much of the effort to study these new emergent effects, like the breakdown of the conventional Fermi-liquid theory in metals has been focused in narrow band electronic systems. But Spin or Charge ordered phases in insulating systems can also be tuned to absolute zero using hydrostatic pressure. Close to such a zero temperature phase transition, physical quantities like resistivity, magnetisation and dielectrics constant change into radically unconventional forms due to the fluctuations experienced in this region giving rise to new kinds ordered states including superconductivity in the metallic systems [Preview Abstract] |
Monday, July 8, 2013 2:15PM - 2:30PM |
D2.00002: Pressure-induced quantum critical behavior in the heavy-fermion compound CeCoGe$_{2.2}$Si$_{0.8}$ J. Larrea Jimenez, M. Martelli, S. Paschen, J. Teyssier, A. Strydom, H. Ronnow The pressure-tuned quantum critical point (QCP) of the antiferromagnetic heavy-fermion compound CeCoGe$_{2.1}$Si$_{0.9}$ was claimed to be dominated by different effects on both sides of the QCP: on the magnetic side spin fluctuations govern the criticality, while on the non-magnetic side the criticality is dominated by disorder that quenches the spin fluctuations. Here we study high-quality CeCoGe$_{2.2}$Si$_{0.8}$ samples with residual resistance ratios four times larger than those of the previously investigated CeCoGe$_{2.1}$Si$_{0.9}$ samples. Interestingly, while DC magnetic susceptibility measurements show that the N\'{e}el temperature of $T_{N} = $ 4K at zero pressure is only slightly reduced by pressure up to 3.0 kbar, a much stronger decrease is observed for the specific heat anomaly. We will present electrical resistivity and specific heat measurements up to 15 kbar and down to 0.05 K, and establish the pressure -- temperature phase diagram for CeCoGe$_{2.2}$Si$_{0.8}$. The critical behavior shall be compared to the one observed for both CeCoGe$_{2.1}$Si$_{0.9}$ and the pure reference compound CeCoGe$_{3}$. [Preview Abstract] |
Monday, July 8, 2013 2:30PM - 2:45PM |
D2.00003: Pressure induced phase transitions studies using advanced synchrotron techniques Haozhe Liu, Lisa Liu, Jinggeng Zhao In this presentation, the joint effort on high pressure research through program of Harbin Institute of Technology (HIT) Overseas Collaborative Base at Argonne will be introduced. Selected research projects on pressure induced phase transitions at room temperature and high/low temperature conditions, such as A2B3 type topological insulators, iron arsenide superconductors, piezoelectric/ferroelectric materials, ABO3 type single crystals and metallic glasses, will be presented. Recent development on imaging and diffraction tomography techniques in diamond anvil cell will be reviewed as well. [Preview Abstract] |
Monday, July 8, 2013 2:45PM - 3:15PM |
D2.00004: ABSTRACT WITHDRAWN |
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