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  • American Institute of Physics (AIP)  (29)
  • American Association for the Advancement of Science (AAAS)  (20)
  • 1
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    Bulk crystal growth and electronic characterization of the 3D Dirac semimetal Na3Bi (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-18
    Description: High quality hexagon plate-like Na 3 Bi crystals with large (001) plane surfaces were grown from a molten Na flux. The freshly cleaved crystals were analyzed by low temperature scanning tunneling microscopy and angle-resolved photoemission spectroscopy, allowing for the characterization of the three-dimensional (3D) Dirac semimetal (TDS) behavior and the observation of the topological surface states. Landau levels were observed, and the energy-momentum relations exhibited a linear dispersion relationship, characteristic of the 3D TDS nature of Na 3 Bi. In transport measurements on Na 3 Bi crystals, the linear magnetoresistance and Shubnikov-de Haas quantum oscillations are observed for the first time.
    Electronic ISSN: 2166-532X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by American Institute of Physics (AIP)
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  • 2
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    Local phonon mode in thermoelectric Bi2Te2Se from charge neutral antisites (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-01-29
    Description: Local modes caused by defects play a significant role in the thermal transport properties of thermoelectrics. Of particular interest are charge-neutral defects that suppress thermal conductivity, without significantly reducing electrical transport. Here, we report a temperature dependent Raman study that identifies such a mode in a standard thermoelectric material, Bi 2 Te 2 Se. One of the modes observed, whose origin has been debated for decades, was shown most likely to be an antisite defect induced local mode. The anomalous temperature independent broadening of the local mode is ascribed to the random arrangement of Se atoms. The temperature renormalization of all modes is well explained by an anharmonic model–Klemens's model.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Large anomalous Hall effect in ferromagnetic insulator-topological insulator heterostructures (2014)
    American Institute of Physics (AIP)
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    Publication Date: 2014-08-09
    Description: We demonstrate the van der Waals epitaxy of the topological insulator compound Bi 2 Te 3 on the ferromagnetic insulator Cr 2 Ge 2 Te 6 . The layers are oriented with (001)Bi 2 Te 3 ||(001)Cr 2 Ge 2 Te 6 and (110)Bi 2 Te 3 ||(100)Cr 2 Ge 2 Te 6 . Cross-sectional transmission electron microscopy indicates the formation of a sharp interface. At low temperatures, bilayers consisting of Bi 2 Te 3 on Cr 2 Ge 2 Te 6 exhibit a large anomalous Hall effect (AHE). Tilted field studies of the AHE indicate that the easy axis lies along the c-axis of the heterostructure, consistent with magnetization measurements in bulk Cr 2 Ge 2 Te 6 . The 61 K Curie temperature of Cr 2 Ge 2 Te 6 and the use of near-stoichiometric materials may lead to the development of spintronic devices based on the AHE.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Pressure dependence of the superconducting transition temperature of magnesium diboride (2001)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2001-04-03
    Description: We studied the pressure and temperature dependence of the electrical resistivity of the superconducting compound magnesium diboride (MgB(2)). The superconducting transition temperature decreases monotonically with pressure, being parabolic or linear, depending on samples. The rate of decrease under pressure is higher than in conventional superconductors. We discuss our results in terms of the semimetallic character of the electronic band structure of MgB(2).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Monteverde, M -- Nunez-Regueiro, M -- Rogado, N -- Regan, K A -- Hayward, M A -- He, T -- Loureiro, S M -- Cava, R J -- New York, N.Y. -- Science. 2001 Apr 6;292(5514):75-7. Epub 2001 Mar 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre de Recherches sur les Tres Basses Temperatures, CNRS, BP166 Cedex 09, 38042 Grenoble, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11283353" 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
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  • 5
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    Single-Crystal Epitaxial Thin Films of the Isotropic Metallic Oxides Sr1-xCaxRuO3 (0 le x le 1) (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-12-11
    Description: Single-crystal epitaxial thin films of the isotropic metallic oxides Sr1-xCaxRuO(3) (0 〈/= x 〈/= 1) were grown on miscut SrTiO(3)(100) substrates in situ by 90 degrees off-axis sputtering. These thin films exhibit low isotropic resistivities, excellent chemical and thermal stability, good surface smoothness, and high crystalline quality. Furthermore, the lattice parameters and magnetic properties can be varied by simply changing the strontium/calcium ratio. These epitaxial thin films, and their multilayer structures with other oxide materials, can be used for the fabrication of superconducting, ferroelectric, magneto-optic, and electro-optic devices.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eom, C B -- Cava, R J -- Fleming, R M -- Phillips, J M -- Vandover, R B -- Marshall, J H -- Hsu, J W -- Krajewski, J J -- Peck, W F Jr -- New York, N.Y. -- Science. 1992 Dec 11;258(5089):1766-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17831659" 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
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  • 6
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    Structural chemistry and the local charge picture of copper oxide superconductors (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-09
    Description: The crystal structures of the known copper oxide superconductors are described, with particular emphasis on the manner in which they fall into structural families. The local charge picture, a framework for understanding the influence of chemical composition, stoichiometry, and doping on the electrical properties of complex structures, is also described.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cava, R J -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):656-62.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17771881" 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
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  • 7
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    Phase transitions of Dirac electrons in bismuth (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-07-26
    Description: The Dirac Hamiltonian, which successfully describes relativistic fermions, applies equally well to electrons in solids with linear energy dispersion, for example, in bismuth and graphene. A characteristic of these materials is that a magnetic field less than 10 tesla suffices to force the Dirac electrons into the lowest Landau level, with resultant strong enhancement of the Coulomb interaction energy. Moreover, the Dirac electrons usually come with multiple flavors or valley degeneracy. These ingredients favor transitions to a collective state with novel quantum properties in large field. By using torque magnetometry, we have investigated the magnetization of bismuth to fields of 31 tesla. We report the observation of sharp field-induced phase transitions into a state with striking magnetic anisotropy, consistent with the breaking of the threefold valley degeneracy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Lu -- Checkelsky, J G -- Hor, Y S -- Uher, C -- Hebard, A F -- Cava, R J -- Ong, N P -- New York, N.Y. -- Science. 2008 Jul 25;321(5888):547-50. doi: 10.1126/science.1158908.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Princeton University, NJ 08544, USA. luli@princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18653888" 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
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  • 8
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    Observation of unconventional quantum spin textures in topological insulators (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-02-14
    Description: A topologically ordered material is characterized by a rare quantum organization of electrons that evades the conventional spontaneously broken symmetry-based classification of condensed matter. Exotic spin-transport phenomena, such as the dissipationless quantum spin Hall effect, have been speculated to originate from a topological order whose identification requires a spin-sensitive measurement, which does not exist to this date in any system. Using Mott polarimetry, we probed the spin degrees of freedom and demonstrated that topological quantum numbers are completely determined from spin texture-imaging measurements. Applying this method to Sb and Bi(1-x)Sb(x), we identified the origin of its topological order and unusual chiral properties. These results taken together constitute the first observation of surface electrons collectively carrying a topological quantum Berry's phase and definite spin chirality, which are the key electronic properties component for realizing topological quantum computing bits with intrinsic spin Hall-like topological phenomena.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hsieh, D -- Xia, Y -- Wray, L -- Qian, D -- Pal, A -- Dil, J H -- Osterwalder, J -- Meier, F -- Bihlmayer, G -- Kane, C L -- Hor, Y S -- Cava, R J -- Hasan, M Z -- New York, N.Y. -- Science. 2009 Feb 13;323(5916):919-22. doi: 10.1126/science.1167733.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Joseph Henry Laboratories of Physics, Department of Physics, Princeton University, Princeton, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19213915" 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
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  • 9
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    Quantum oscillations and hall anomaly of surface states in the topological insulator Bi2Te3 (2010)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2010-07-31
    Description: Topological insulators are insulating materials that display massless, Dirac-like surface states in which the electrons have only one spin degree of freedom on each surface. These states have been imaged by photoemission, but little information on their transport parameters, for example, mobility, is available. We report the observation of Shubnikov-de Haas oscillations arising from the surface states in nonmetallic crystals of Bi(2)Te(3). In addition, we uncovered a Hall anomaly in weak fields, which enables the surface current to be seen directly. Both experiments yield a surface mobility (9000 to 10,000 centimeter(2) per volt-second) that is substantially higher than in the bulk. The Fermi velocity of 4 x 10(5) meters per second obtained from these transport experiments agrees with angle-resolved photoemission experiments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qu, Dong-Xia -- Hor, Y S -- Xiong, Jun -- Cava, R J -- Ong, N P -- New York, N.Y. -- Science. 2010 Aug 13;329(5993):821-4. doi: 10.1126/science.1189792. Epub 2010 Jul 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Princeton University, Princeton, NJ 08544, USA. dqu@princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20671155" 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
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  • 10
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    Topological phase transition and texture inversion in a tunable topological insulator (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-04-02
    Description: The recently discovered three-dimensional or bulk topological insulators are expected to exhibit exotic quantum phenomena. It is believed that a trivial insulator can be twisted into a topological state by modulating the spin-orbit interaction or the crystal lattice, driving the system through a topological quantum phase transition. By directly measuring the topological quantum numbers and invariants, we report the observation of a phase transition in a tunable spin-orbit system, BiTl(S(1-delta)Se(delta))(2), in which the topological state formation is visualized. In the topological state, vortex-like polarization states are observed to exhibit three-dimensional vectorial textures, which collectively feature a chirality transition as the spin momentum-locked electrons on the surface go through the zero carrier density point. Such phase transition and texture inversion can be the physical basis for observing fractional charge (+/-e/2) and other fractional topological phenomena.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, Su-Yang -- Xia, Y -- Wray, L A -- Jia, S -- Meier, F -- Dil, J H -- Osterwalder, J -- Slomski, B -- Bansil, A -- Lin, H -- Cava, R J -- Hasan, M Z -- New York, N.Y. -- Science. 2011 Apr 29;332(6029):560-4. doi: 10.1126/science.1201607. Epub 2011 Mar 31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Joseph Henry Laboratory of Physics, Department of Physics, Princeton University, Princeton, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21454752" target="_blank"〉PubMed〈/a〉
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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