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  1. Book ; Online: Correlation Driven Magnetic Frustration and Insulating Behavior of TiF$_3$

    Fernando, Gayanath W. / Sheets, Donal / Hancock, Jason / Ernst, Arthur / Geilhufe, R. Matthias

    2023  

    Abstract: We investigate the halide perovskite TiF$_3$, renowned for its intricate interplay between structure, electronic correlations, magnetism, and thermal expansion. Despite its simple structure, understanding its low-temperature magnetic behavior has been a ... ...

    Abstract We investigate the halide perovskite TiF$_3$, renowned for its intricate interplay between structure, electronic correlations, magnetism, and thermal expansion. Despite its simple structure, understanding its low-temperature magnetic behavior has been a challenge. Previous theories proposed antiferromagnetic ordering. In contrast, experimental signatures for an ordered magnetic state are absent down to 10~K. Our current study has successfully reevaluated the theoretical modeling of TiF$_3$, unveiling the significance of strong electronic correlations as the key driver for its insulating behavior and magnetic frustration. In addition, our frequency-dependent optical reflectivity measurements exhibit clear signs of an insulating state. Analysis of the calculated magnetic data gives an antiferromagnetic exchange coupling with a net Weiss temperature of order 25~K as well as a magnetic response consistent with a $S$=1/2 local moment per Ti$^{3+}$. Yet, the system shows no susceptibility peak at this temperature scale and appears free of long-range antiferromagnetic order down to 1~K. Extending ab initio modeling of the material to larger unit cells shows a tendency for relaxing into a non-collinear magnetic ordering, with a shallow energy landscape between several magnetic ground states, promoting the status of this simple, nearly cubic perovskite structured material as a candidate spin liquid.

    Comment: 6 pages, 5 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science ; Physics - Computational Physics
    Subject code 530
    Publishing date 2023-10-19
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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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
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Order via subito

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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: 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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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. 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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  8. Article ; Online: Exploring itinerant states in divalent hexaborides using rare-earth L edge resonant inelastic x-ray scattering.

    Sheets, Donal / Flynn, Vincent / Kim, Jungho / Upton, Mary / Casa, Diego / Gog, Thomas / Fisk, Zachary / Dzero, Maxim / Rosa, Priscila F S / Mazzone, Daniel G / Jarrige, Ignace / Zhu, Jian-Xin / Hancock, Jason

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

    2019  Volume 32, Issue 13, Page(s) 135601

    Abstract: We present a study of resonant inelastic x-ray scattering (RIXS) spectra collected at the rare-earth L edges of divalent hexaborides ... ...

    Abstract We present a study of resonant inelastic x-ray scattering (RIXS) spectra collected at the rare-earth L edges of divalent hexaborides YbB
    Language English
    Publishing date 2019-11-29
    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/ab5e0f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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