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  • 1
    Electronic Resource
    Electronic Resource
    LOCAL MOMENTS NEAR THE METAL-INSULATOR TRANSITION (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 581 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: This paper reviews recent progress in understanding the metal-insulator transition in a system of spin-1/2 interacting electrons in the presence of a non-magnetic random potential. Using results of recent experiments in doped semiconductors, it is argued that the metallic state near the transition can be described by a phenomenological two-fluid model of local moments and itinerant quasiparticles. A mean-field calculation on a disordered Hubbard model which justifies this two fluid model is described. Recent advances in the non-linear sigma model description of the transition are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb22719.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Production of Rat Stem Cell Factor from BRL Cells by Microcarrier Perfusion Culture (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 665 (1992), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1992.tb42600.x
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrate assimilation in leaf blades of wheat of different age (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 48 (1980), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A field experiment on wheat (Triticum aestivum L.) ev. Shera grown at 120 kg N ha−1 was conducted. Half of the dose of fertilizer N was applied at the pre-sowing stage and the other half when the seedlings were one month old. The leaf blades were examined for their NO3− content and NO3− assimilatory activity at various stages of growth and development. Soil nitrate level at 50 cm depth was determined throughout the wheat growing season in terms of cencentration (μg/ml) and total amount (kg ha−1). The upper leaf blades were examined for their capacity to assimilate NO3−. Highly significant correlation between NR (nitrate reductase) activity and NO3− content in the leaf blades. NR activity and soil NO3−, and between soil NO3− and leaf blade NO3− was observed. Findings on low soil NO3− status during the reproductive phase and the capacity of the upper leaf blades to assimilate additional amounts of NO3−, point to the need for developing a programme of soil fertilizer application whereby all the leaf blades can utilize the NO3− optimally and thus result in greater N harvest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1980.tb03289.x
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  • 4
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    Quantum impurity in a nearly critical two-dimensional antiferromagnet (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-05
    Description: The spin dynamics of an arbitrary localized impurity in an insulating two-dimensional antiferromagnet, across the host transition from a paramagnet with a spin gap to a Neel state, is described. The impurity spin susceptibility has a Curie-like divergence at the quantum-critical coupling, but with a universal effective spin that is neither an integer nor a half-odd integer. In the Neel state, the transverse impurity susceptibility is a universal number divided by the host spin stiffness (which determines the energy cost to slow twists in the orientation of the Neel order). These and numerous other results for the thermodynamics, Knight shift, and magnon damping have important applications in experiments on layered transition metal oxides.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev -- Buragohain -- Vojta -- New York, N.Y. -- Science. 1999 Dec 24;286(5449):2479-82.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Yale University, Post Office Box 208120, New Haven, CT 06520-8120, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10617456" 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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  • 5
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    Quantum criticality: competing ground states in low dimensions (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-04-25
    Description: Small changes in an external parameter can often lead to dramatic qualitative changes in the lowest energy quantum mechanical ground state of a correlated electron system. In anisotropic crystals, such as the high-temperature superconductors where electron motion occurs primarily on a two-dimensional square lattice, the quantum critical point between two such lowest energy states has nontrivial emergent excitations that control the physics over a significant portion of the phase diagram. Nonzero temperature dynamic properties near quantum critical points are described, using simple theoretical models. Possible quantum phases and transitions in the two-dimensional electron gas on a square lattice are discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev -- New York, N.Y. -- Science. 2000 Apr 21;288(5465):475-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Yale University, Post Office Box 208120, New Haven, CT 06520-8120, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10775100" 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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    Topological defects coupling smectic modulations to intra-unit-cell nematicity in cuprates (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-07-23
    Description: We study the coexisting smectic modulations and intra-unit-cell nematicity in the pseudogap states of underdoped Bi(2)Sr(2)CaCu(2)O(8+delta). By visualizing their spatial components separately, we identified 2pi topological defects throughout the phase-fluctuating smectic states. Imaging the locations of large numbers of these topological defects simultaneously with the fluctuations in the intra-unit-cell nematicity revealed strong empirical evidence for a coupling between them. From these observations, we propose a Ginzburg-Landau functional describing this coupling and demonstrate how it can explain the coexistence of the smectic and intra-unit-cell broken symmetries and also correctly predict their interplay at the atomic scale. This theoretical perspective can lead to unraveling the complexities of the phase diagram of cuprate high-critical-temperature superconductors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mesaros, A -- Fujita, K -- Eisaki, H -- Uchida, S -- Davis, J C -- Sachdev, S -- Zaanen, J -- Lawler, M J -- Kim, Eun-Ah -- New York, N.Y. -- Science. 2011 Jul 22;333(6041):426-30. doi: 10.1126/science.1201082.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituut-Lorentz for Theoretical Physics, Universiteit Leiden, 2300 Leiden, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21778393" 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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    2012 election. Food labeling issue tops state ballot questions (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-11-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev, Meghna -- New York, N.Y. -- Science. 2012 Oct 26;338(6106):464. doi: 10.1126/science.338.6106.464.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23112307" target="_blank"〉PubMed〈/a〉
    Keywords: California ; Food Labeling/*legislation & jurisprudence ; *Food, Genetically Modified ; *Plants, Genetically Modified ; *Politics
    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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    Physics. Entangling superconductivity and antiferromagnetism (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-06-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev, Subir -- New York, N.Y. -- Science. 2012 Jun 22;336(6088):1510-1. doi: 10.1126/science.1223586.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Harvard University, Cambridge, MA 02138, USA. sachdev@physics.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22723399" 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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  • 9
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    Sign-problem-free quantum Monte Carlo of the onset of antiferromagnetism in metals (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-12-22
    Description: The quantum theory of antiferromagnetism in metals is necessary for our understanding of numerous intermetallic compounds of widespread interest. In these systems, a quantum critical point emerges as external parameters (such as chemical doping) are varied. Because of the strong coupling nature of this critical point and the "sign problem" plaguing numerical quantum Monte Carlo (QMC) methods, its theoretical understanding is still incomplete. Here, we show that the universal low-energy theory for the onset of antiferromagnetism in a metal can be realized in lattice models, which are free from the sign problem and hence can be simulated efficiently with QMC. Our simulations show Fermi surface reconstruction and unconventional spin-singlet superconductivity across the critical point.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berg, Erez -- Metlitski, Max A -- Sachdev, Subir -- New York, N.Y. -- Science. 2012 Dec 21;338(6114):1606-9. doi: 10.1126/science.1227769.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Harvard University, Cambridge, MA 02138, USA. erez.berg@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23258893" 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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    Superconductivity. Tuning order in cuprate superconductors (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-01-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sachdev, Subir -- Zhang, Shou-Cheng -- New York, N.Y. -- Science. 2002 Jan 18;295(5554):452-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Yale University, New Haven, CT 06520, USA. subir.sachdev@yale.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11799229" 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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