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  • 1
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    Phonon density of states of single-crystal SrFe_{2} As_{2} across the collapsed phase transition at high pressure (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-07-26
    Description: Author(s): Y. Q. Wang, P. C. Lu, J. J. Wu, J. Liu, X. C. Wang, J. Y. Zhao, W. Bi, E. E. Alp, C. Y. Park, D. Popov, C. Q. Jin, J. Sun, and J. F. Lin To help our understanding of the structural and superconducting transitions in ferropnictides, partial phonon density of states (PDOS) of iron in a single-crystal SrF e 2 A s 2 pnictide have been investigated from both out-of-plane and in-plane polarizations with respect to the basal plane of the crystal… [Phys. Rev. B 94, 014516] Published Mon Jul 25, 2016
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Pressure and temperature dependence of the Ce valence and c−f hybridization gap in CeT_{2} In_{5} (T=Co,Rh,Ir) heavy-fermion superconductors (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-12-09
    Description: Author(s): H. Yamaoka, Y. Yamamoto, E. F. Schwier, F. Honda, Y. Zekko, Y. Ohta, J.-F. Lin, M. Nakatake, H. Iwasawa, M. Arita, K. Shimada, N. Hiraoka, H. Ishii, K.-D. Tsuei, and J. Mizuki Pressure- and temperature-induced changes in the Ce valence and c − f hybridization of the Ce115 superconductors have been studied systematically. Resonant x-ray-emission spectroscopy indicated that the increase of the Ce valence with pressure was significant for CeCoIn 5 , and moderate for CeIr ( In 0.925 … [Phys. Rev. B 92, 235110] Published Mon Dec 07, 2015
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Equation of state of a high-pressure phase of Gd_{3} Ga_{5} O_{12} (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-02-25
    Description: Author(s): Z. Mao, S. M. Dorfman, S. R. Shieh, J. F. Lin, V. B. Prakapenka, Y. Meng, and T. S. Duffy Gd_{3} Ga_{5} O_{12} (GGG), which crystallizes in the garnet structure at ambient conditions, was observed to transform to a high-pressure phase at 88 GPa after laser heating at 1500 K. This new phase is stable at least up to 180 GPa, and can be preserved on decompression to 50 GPa. This phase is cu... [Phys. Rev. B 83, 054114] Published Thu Feb 24, 2011
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Magnetic and structural transitions of SrFe2As2 at high pressure and low temperature (2014)
    Springer Nature
    Details
    Publication Date: 2014-01-15
    Description: One of key issues in studying iron based superconductors is to understand how the magnetic phase of the parent compounds evolves. Here we report the systematic investigation of paramagnetic to antiferromagnetic and tetragonal to orthorhombic structural transitions of “122” SrFe2As2 parent compound using combined high resolution synchrotron Mössbauer spectroscopy and x-ray diffraction techniques in a cryogenically cooled high pressure diamond anvil cell. It is found that although the two transitions are coupled at 205 K at ambient pressure, they are concurrently suppressed to much lower temperatures near a quantum critical pressure of approximately 4.8 GPa where the antiferromagnetic state transforms into bulk superconducting state. Our results indicate that the lattice distortions and magnetism jointly play a critical role in inducing superconductivity in iron based compounds. Scientific Reports 4 doi: 10.1038/srep03685
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 5
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    Role of Valence Fluctuations in the Superconductivity of Ce122 Compounds (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-08-21
    Description: Author(s): H. Yamaoka, Y. Ikeda, I. Jarrige, N. Tsujii, Y. Zekko, Y. Yamamoto, J. Mizuki, J.-F. Lin, N. Hiraoka, H. Ishii, K.-D. Tsuei, T. C. Kobayashi, F. Honda, and Y. Ōnuki Pressure dependence of the Ce valence in CeCu2Ge2 has been measured up to 24 GPa at 300 K and to 17 GPa at 18–20 K using x-ray absorption spectroscopy in the partial fluorescence yield. A smooth increase of the Ce valence with pressure is observed across the two superconducting (SC) regions without ... [Phys. Rev. Lett. 113, 086403] Published Wed Aug 20, 2014
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Iron-silicon alloy in Earth's core? (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-01-12
    Description: We have investigated the phase relations in the iron-rich portion of the iron-silicon (Fe-Si) alloys at high pressures and temperatures. Our study indicates that Si alloyed with Fe can stabilize the body-centered cubic (bcc) phase up to at least 84 gigapascals (compared to approximately 10 gigapascals for pure Fe) and 2400 kelvin. Earth's inner core may be composed of hexagonal close-packed (hcp) Fe with up to 4 weight percent Si, but it is also conceivable that the inner core could be a mixture of a Si-rich bcc phase and a Si-poor hcp phase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Jung-Fu -- Heinz, Dion L -- Campbell, Andrew J -- Devine, James M -- Shen, Guoyin -- New York, N.Y. -- Science. 2002 Jan 11;295(5553):313-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of the Geophysical Sciences, James Franck Institute, Consortium for Advanced Radiation Sources, University of Chicago, Chicago, IL 60637, USA. afu@geosci.uchicago.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11786640" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Sound velocities of hot dense iron: Birch's law revisited (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-06-25
    Description: Sound velocities of hexagonal close-packed iron (hcp-Fe) were measured at pressures up to 73 gigapascals and at temperatures up to 1700 kelvin with nuclear inelastic x-ray scattering in a laser-heated diamond anvil cell. The compressional-wave velocities (VP) and shear-wave velocities (VS) of hcp-Fe decreased significantly with increasing temperature under moderately high pressures. VP and VS under high pressures and temperatures thus cannot be fitted to a linear relation, Birch's law, which has been used to extrapolate measured sound velocities to densities of iron in Earth's interior. This result means that there are more light elements in Earth's core than have been inferred from linear extrapolation at room temperature.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Jung-Fu -- Sturhahn, Wolfgang -- Zhao, Jiyong -- Shen, Guoyin -- Mao, Ho-Kwang -- Hemley, Russell J -- New York, N.Y. -- Science. 2005 Jun 24;308(5730):1892-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, DC 20015, USA. j.lin@gl.ciw.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15976298" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    The magnetic properties of the star Kepler-78 (2016)
    Oxford University Press
    Details
    Publication Date: 2016-04-29
    Description: Kepler-78 is host to a transiting 8.5-h orbit super-Earth. In this paper, the rotation and magnetic properties of the planet host star are studied. We first revisit the Kepler photometric data for a detailed description of the rotation properties of Kepler-78, showing that the star seems to undergo a cycle in the spot pattern of ~1300 d duration. We then use spectropolarimetric observations with Canada–France–Hawaii Telescope (CFHT)/ESPaDOnS to measure the circular polarization in the line profile of the star during its rotation cycle, as well as spectroscopic proxies of the chromospheric activity. The average field has a strength of 16 G. The magnetic topology is characterized by a poloidal and a toroidal component, encompassing 60 per cent and 40 per cent of the magnetic energy, respectively. Differential rotation is detected with an estimated rate of 0.105±0.039 rad d –1 . Activity tracers vary with the rotation cycle of the star; there is no hint that a residual activity level is related to the planetary orbit at the precision of our data. The description of the star magnetic field's characteristics then may serve as input for models of interactions between the star and its close-by planet, e.g. Ohmic dissipation and unipolar induction.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Spin transition zone in Earth's lower mantle (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-09-22
    Description: Mineral properties in Earth's lower mantle are affected by iron electronic states, but representative pressures and temperatures have not yet been probed. Spin states of iron in lower-mantle ferropericlase have been measured up to 95 gigapascals and 2000 kelvin with x-ray emission in a laser-heated diamond cell. A gradual spin transition of iron occurs over a pressure-temperature range extending from about 1000 kilometers in depth and 1900 kelvin to 2200 kilometers and 2300 kelvin in the lower mantle. Because low-spin ferropericlase exhibits higher density and faster sound velocities relative to the high-spin ferropericlase, the observed increase in low-spin (Mg,Fe)O at mid-lower mantle conditions would manifest seismically as a lower-mantle spin transition zone characterized by a steeper-than-normal density gradient.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, Jung-Fu -- Vanko, Gyorgy -- Jacobsen, Steven D -- Iota, Valentin -- Struzhkin, Viktor V -- Prakapenka, Vitali B -- Kuznetsov, Alexei -- Yoo, Choong-Shik -- New York, N.Y. -- Science. 2007 Sep 21;317(5845):1740-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lawrence Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore, CA 94550, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17885134" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Using the Earth as a polarized electron source to search for long-range spin-spin interactions (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-02-23
    Description: Many particle-physics models that extend the standard model predict the existence of long-range spin-spin interactions. We propose an approach that uses the Earth as a polarized spin source to investigate these interactions. Using recent deep-Earth geophysics and geochemistry results, we create a comprehensive map of electron polarization within the Earth induced by the geomagnetic field. We examine possible long-range interactions between these spin-polarized geoelectrons and the spin-polarized electrons and nucleons in three laboratory experiments. By combining our model and the results from these experiments, we establish bounds on torsion gravity and possible long-range spin-spin forces associated with the virtual exchange of either spin-one axial bosons or unparticles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hunter, Larry -- Gordon, Joel -- Peck, Stephen -- Ang, Daniel -- Lin, Jung-Fu -- New York, N.Y. -- Science. 2013 Feb 22;339(6122):928-32. doi: 10.1126/science.1227460.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Physics Department, Amherst College, Amherst, MA 01002, USA. lrhunter@amherst.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23430649" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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