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  1. Article ; Online: Infrared lattice dynamics in negative thermal expansion material in single-crystal ScF

    Handunkanda, Sahan U / Curry, Erin B / Voronov, Vladimir / Hancock, Jason N

    Journal of physics. Condensed matter : an Institute of Physics journal

    2019  Volume 32, Issue 3, Page(s) 35403

    Abstract: Simple cubic 'open' perovskite ... ...

    Abstract Simple cubic 'open' perovskite ScF
    Language English
    Publishing date 2019-09-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ab4955
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: Mott insulating negative thermal expansion perovskite TiF3

    Sheets, Donal / Lyszak, Kaitlin / Jain, Menka / Fernando, Gayanath W. / Sochnikov, Ilya / Franklin, Jacob / Geilhufe, R. Mattias / Hancock, Jason N.

    2023  

    Abstract: We characterize perovskite TiF_3, a material which displays significant negative thermal expansion at elevated temperatures above its cubic-to-rhombohedral structural phase transition at 330 K. We find the optical response favors an insulating state in ... ...

    Abstract We characterize perovskite TiF_3, a material which displays significant negative thermal expansion at elevated temperatures above its cubic-to-rhombohedral structural phase transition at 330 K. We find the optical response favors an insulating state in both structural phases, which we show can be produced in density functional theory calculations only through the introduction of an on-site Coulomb repulsion. Analysis of the magnetic susceptibility data gives a S=1/2 local moment per Ti+3 ion and an antiferromagnetic exchange coupling. Together, these results show that TiF_3 is a strongly correlated electron system, a fact which constrains possible mechanisms of strong negative thermal expansion in the Sc_1-xTi_xF3 system. We consider the relative strength of the Jahn-Teller and electric dipole interactions in driving the structural transition.

    Comment: 8 pages, 4 figures, in review Physical Review B
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science ; Condensed Matter - Other Condensed Matter
    Subject code 530
    Publishing date 2023-11-14
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Comment on "Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks".

    Hancock, Jason N / Plumley, Michael J / Schilling, Katherine / Sheets, Donal / Wilen, Lawrence

    ACS nano

    2020  Volume 14, Issue 9, Page(s) 10758–10763

    MeSH term(s) Aerosols ; Filtration ; Masks ; Textiles
    Chemical Substances Aerosols
    Keywords covid19
    Language English
    Publishing date 2020-09-22
    Publishing country United States
    Document type Letter ; Comment
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.0c05827
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: An apparatus for rapid and nondestructive comparison of masks and respirators.

    Sheets, Donal / Shaw, Jamie / Baldwin, Michael / Daggett, David / Elali, Ibrahim / Curry, Erin B / Sochnikov, Ilya / Hancock, Jason N

    The Review of scientific instruments

    2020  Volume 91, Issue 11, Page(s) 114101

    Abstract: The SARS-CoV-2 global pandemic has produced widespread shortages of certified air-filtering personal protection equipment and an acute need for rapid evaluation of breathability and filtration efficiency of proposed alternative solutions. Here, we ... ...

    Abstract The SARS-CoV-2 global pandemic has produced widespread shortages of certified air-filtering personal protection equipment and an acute need for rapid evaluation of breathability and filtration efficiency of proposed alternative solutions. Here, we describe experimental efforts to nondestructively quantify three vital characteristics of mask approaches: breathability, material filtration effectiveness, and sensitivity to fit. We focus on protection against aqueous aerosols >0.3 μm using off-the-shelf particle, flow, and pressure sensors, permitting rapid comparative evaluation of these three properties. We present and discuss both the pressure drop and the particle penetration as a function of flow to permit comparison of relative protection for a set of proposed filter and mask designs. The design considerations of the testing apparatus can be reproduced by university laboratories and medical facilities and used for rapid local quality control of respirator masks that are of uncertified origin, monitoring the long-term effects of various disinfection schemes and evaluating improvised products not designed or marketed for filtration.
    MeSH term(s) Aerosols ; Air Microbiology ; Air Movements ; Air Pressure ; COVID-19/prevention & control ; COVID-19/transmission ; Equipment Design/standards ; Face ; Filtration/instrumentation ; Humans ; Masks/standards ; Materials Testing/instrumentation ; Materials Testing/standards ; N95 Respirators/standards ; Pandemics/prevention & control ; Particle Size ; Respiratory Protective Devices/standards ; SARS-CoV-2
    Chemical Substances Aerosols
    Language English
    Publishing date 2020-11-27
    Publishing country United States
    Document type Comparative Study ; Evaluation Study ; Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0015983
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  5. Article: Comment on "Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks"

    Hancock, Jason N / Plumley, Michael J / Schilling, Katherine / Sheets, Donal / Wilen, Lawrence

    ACS Nano

    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #783464
    Database COVID19

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  6. Article: Negative Thermal Expansion Near the Precipice of Structural Stability in Open Perovskites.

    Occhialini, Connor A / Guzmán-Verri, Gian G / Handunkanda, Sahan U / Hancock, Jason N

    Frontiers in chemistry

    2018  Volume 6, Page(s) 545

    Abstract: Negative thermal expansion (NTE) describes the anomalous propensity of materials to shrink when heated. Since its discovery, the NTE effect has been found in a wide variety of materials with an array of magnetic, electronic and structural properties. In ... ...

    Abstract Negative thermal expansion (NTE) describes the anomalous propensity of materials to shrink when heated. Since its discovery, the NTE effect has been found in a wide variety of materials with an array of magnetic, electronic and structural properties. In some cases, the NTE originates from phase competition arising from the electronic or magnetic degrees of freedom but we here focus on a particular class of NTE which originates from intrinsic dynamical origins related to the lattice degrees of freedom, a property we term
    Language English
    Publishing date 2018-11-20
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2711776-5
    ISSN 2296-2646
    ISSN 2296-2646
    DOI 10.3389/fchem.2018.00545
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  7. Article: An apparatus for nondestructive and rapid comparison of mask approaches in defense against infected respiratory aerosols

    Sheets, Donal / Shaw, Jamie / Baldwin, Michael / Daggett, David / Elali, Ibrahim / Curry, Erin / Sochnikov, Ilya / Hancock, Jason N.

    Abstract: At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being ... ...

    Abstract At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being advised to wear masks to help stop the spread. As a result, in the absence of centrally coordinated production and distribution efforts, supply chains for masks, respirators, and materials for advanced filtration technology are immensely burdened. Here we describe experimental efforts to nondestructively quantify three vital characteristics of mask approaches: breathability, material filtration effectiveness, and sensitivity to fit. We focus on protection against water aerosols $>$0.3$\mu$m using off-the-shelf particulate, flow, and pressure sensors, permitting rapid comparative evaluation of these three properties. We present and discuss both the pressure drop and the particle transmission as a function of flow to permit comparison of relative protection for a set of proposed filter and mask designs. The design considerations of the testing apparatus can be reproduced by university laboratories and medical facilities and used for rapid local quality control of respirator masks which are of uncertified origin, monitoring the long-term effects of various disinfection schemes, and evaluating improvised products not designed or marketed for filtration.
    Keywords covid19
    Publisher ArXiv
    Document type Article
    Database COVID19

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  8. Book ; Online: An apparatus for nondestructive and rapid comparison of mask approaches in defense against infected respiratory aerosols

    Sheets, Donal / Shaw, Jamie / Baldwin, Michael / Daggett, David / Elali, Ibrahim / Curry, Erin / Sochnikov, Ilya / Hancock, Jason N.

    2020  

    Abstract: At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being ... ...

    Abstract At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being advised to wear masks to help stop the spread. As a result, in the absence of centrally coordinated production and distribution efforts, supply chains for masks, respirators, and materials for advanced filtration technology are immensely burdened. Here we describe experimental efforts to nondestructively quantify three vital characteristics of mask approaches: breathability, material filtration effectiveness, and sensitivity to fit. We focus on protection against water aerosols $>$0.3$\mu$m using off-the-shelf particulate, flow, and pressure sensors, permitting rapid comparative evaluation of these three properties. We present and discuss both the pressure drop and the particle transmission as a function of flow to permit comparison of relative protection for a set of proposed filter and mask designs. The design considerations of the testing apparatus can be reproduced by university laboratories and medical facilities and used for rapid local quality control of respirator masks which are of uncertified origin, monitoring the long-term effects of various disinfection schemes, and evaluating improvised products not designed or marketed for filtration.

    Comment: submitted, May 2020
    Keywords Physics - Instrumentation and Detectors ; Physics - Medical Physics ; covid19
    Subject code 670
    Publishing date 2020-06-03
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Spectroscopic evidence for Fermi liquid-like energy and temperature dependence of the relaxation rate in the pseudogap phase of the cuprates.

    Mirzaei, Seyed Iman / Stricker, Damien / Hancock, Jason N / Berthod, Christophe / Georges, Antoine / van Heumen, Erik / Chan, Mun K / Zhao, Xudong / Li, Yuan / Greven, Martin / Barišić, Neven / van der Marel, Dirk

    Proceedings of the National Academy of Sciences of the United States of America

    2013  Volume 110, Issue 15, Page(s) 5774–5778

    Abstract: Cuprate high-Tc superconductors exhibit enigmatic behavior in the nonsuperconducting state. For carrier concentrations near "optimal doping" (with respect to the highest Tcs) the transport and spectroscopic properties are unlike those of a Landau-Fermi ... ...

    Abstract Cuprate high-Tc superconductors exhibit enigmatic behavior in the nonsuperconducting state. For carrier concentrations near "optimal doping" (with respect to the highest Tcs) the transport and spectroscopic properties are unlike those of a Landau-Fermi liquid. On the Mott-insulating side of the optimal carrier concentration, which corresponds to underdoping, a pseudogap removes quasi-particle spectral weight from parts of the Fermi surface and causes a breakup of the Fermi surface into disconnected nodal and antinodal sectors. Here, we show that the near-nodal excitations of underdoped cuprates obey Fermi liquid behavior. The lifetime τ(ω, T) of a quasi-particle depends on its energy ω as well as on the temperature T. For a Fermi liquid, 1/τ(ω, T) is expected to collapse on a universal function proportional to (ℏω)(2) + (pπk(B)T)(2). Magneto-transport experiments, which probe the properties in the limit ω = 0, have provided indications for the presence of a T(2) dependence of the dc (ω = 0) resistivity of different cuprate materials. However, Fermi liquid behavior is very much about the energy dependence of the lifetime, and this can only be addressed by spectroscopic techniques. Our optical experiments confirm the aforementioned universal ω- and T dependence of 1/τ(ω, T), with p ∼ 1.5. Our data thus provide a piece of evidence in favor of a Fermi liquid-like scenario of the pseudogap phase of the cuprates.
    Language English
    Publishing date 2013-03-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1218846110
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  10. Article: Kondo scaling in the optical response of YbIn1-xAgxCu4.

    Hancock, Jason N / McKnew, Tim / Schlesinger, Zack / Sarrao, John L / Fisk, Zach

    Physical review letters

    2004  Volume 92, Issue 18, Page(s) 186405

    Abstract: Theoretical work on Kondo systems predicts universality in the scaling of observable quantities with the Kondo temperature, T(K). Here we report infrared-frequency optical response measurements of the correlated system YbIn(1-x)AgxCu4. We observe that x- ... ...

    Abstract Theoretical work on Kondo systems predicts universality in the scaling of observable quantities with the Kondo temperature, T(K). Here we report infrared-frequency optical response measurements of the correlated system YbIn(1-x)AgxCu4. We observe that x-dependent variations in the frequency and strength of a low-energy excitation are related to the x-dependent Kondo temperature. Comparison of the inferred trends with existing theory and a model calculation provides a framework in which to view these experimental results as scaling phenomena arising from local-moment/conduction electron hybridization.
    Language English
    Publishing date 2004-05-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.92.186405
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