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  1. Book ; Online: Quokka

    Yang, Xianjun / Wilson, Stephen D. / Petzold, Linda

    An Open-source Large Language Model ChatBot for Material Science

    2024  

    Abstract: This paper presents the development of a specialized chatbot for materials science, leveraging the Llama-2 language model, and continuing pre-training on the expansive research articles in the materials science domain from the S2ORC dataset. The ... ...

    Abstract This paper presents the development of a specialized chatbot for materials science, leveraging the Llama-2 language model, and continuing pre-training on the expansive research articles in the materials science domain from the S2ORC dataset. The methodology involves an initial pretraining phase on over one million domain-specific papers, followed by an instruction-tuning process to refine the chatbot's capabilities. The chatbot is designed to assist researchers, educators, and students by providing instant, context-aware responses to queries in the field of materials science. We make the four trained checkpoints (7B, 13B, with or without chat ability) freely available to the research community at https://github.com/Xianjun-Yang/Quokka.

    Comment: Work in progress
    Keywords Computer Science - Computation and Language ; Computer Science - Artificial Intelligence ; Computer Science - Computational Engineering ; Finance ; and Science
    Subject code 001
    Publishing date 2024-01-02
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Unconventional specular optical rotation in the charge ordered state of Kagome metal CsV

    Farhang, Camron / Wang, Jingyuan / Ortiz, Brenden R / Wilson, Stephen D / Xia, Jing

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 5326

    Abstract: Kagome metals ... ...

    Abstract Kagome metals AV
    Language English
    Publishing date 2023-09-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-41080-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Order-disorder charge density wave instability in the kagome metal (Cs,Rb)V

    Subires, D / Korshunov, A / Said, A H / Sánchez, L / Ortiz, Brenden R / Wilson, Stephen D / Bosak, A / Blanco-Canosa, S

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 1015

    Abstract: The origin of the charge density wave phases in the kagome metal compound ... ...

    Abstract The origin of the charge density wave phases in the kagome metal compound AV
    Language English
    Publishing date 2023-02-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-36668-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: No Variation in Patient Care Outcomes After Implementation of Resident Shift Work Duty Hour Limitations and a Hospitalist Model System.

    Hollier, John M / Wilson, Stephen D

    American journal of medical quality : the official journal of the American College of Medical Quality

    2017  Volume 32, Issue 1, Page(s) 27–33

    Abstract: This study examines whether implementing a resident shift work schedule (RSWS) alone or combined with a hospitalist-led model system (HMS/RSWS) affects patient care outcomes or costs at a pediatric tertiary care teaching hospital. A retrospective sample ... ...

    Abstract This study examines whether implementing a resident shift work schedule (RSWS) alone or combined with a hospitalist-led model system (HMS/RSWS) affects patient care outcomes or costs at a pediatric tertiary care teaching hospital. A retrospective sample compared pre- and postintervention groups for the most common primary discharge diagnoses, including asthma and cellulitis (RSWS intervention) and inflammatory bowel disease and diabetic ketoacidosis (HMS/RSWS intervention). Outcome variables included length of stay, number of subspecialty consultations, and hospitalization charges. For the RSWS intervention, the preintervention (n = 107) and postintervention (n = 92) groups showed no difference in any of the outcome variables. For the HMS/RSWS intervention, the preintervention (n = 98) and postintervention (n = 69) groups did not differ in demographics or length of stay. However, subspecialty consultations increased significantly during postintervention from 0.83 to 1.52 consults/hospitalization ( P < .01) without significantly increasing hospitalization charges. Neither the RSWS nor HMS/RSWS intervention affected patient care outcomes at a pediatric tertiary care teaching hospital.
    Language English
    Publishing date 2017-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1131772-3
    ISSN 1555-824X ; 1062-8606
    ISSN (online) 1555-824X
    ISSN 1062-8606
    DOI 10.1177/1062860615613157
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2436: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Book ; Online: Fidelity and variability in the interlayer electronic structure of the kagome superconductor CsV3Sb5

    Watkins, Aurland K. / Johrendt, Dirk / Vlcek, Vojtech / Wilson, Stephen D. / Seshadri, Ram

    2023  

    Abstract: The AV3Sb5 (A = K, Rb, Cs) kagome materials host an interplay of emergent phenomena including superconductivity, charge density wave states, and non-trivial electronic structure topology. The band structures of these materials exhibit a rich variety of ... ...

    Abstract The AV3Sb5 (A = K, Rb, Cs) kagome materials host an interplay of emergent phenomena including superconductivity, charge density wave states, and non-trivial electronic structure topology. The band structures of these materials exhibit a rich variety of features like Dirac crossings, saddle points associated with van Hove singularities, and flat bands prompting significant investigations into the in-plane electronic behavior. However, recent findings including the charge density wave ordering and effects due to pressure or chemical doping point to the importance of understanding interactions between kagome layers. Probing this c-axis electronic structure via experimental methods remains challenging due to limitations of the crystals and, therefore, rigorous computational approaches are necessary to study the interlayer interactions. Here we use first-principles approaches to study the electronic structure of CsV3Sb5 with emphasis on the kz dispersion. We find that the inclusion of nonlocal and dynamical many-body correlation has a substantial impact on the interlayer band structure. We present new band behavior that additionally supports the integration of symmetry in accurately plotting electronic structures and influences further analysis like the calculation of topological invariants.

    Comment: 9 pages, 4 figures
    Keywords Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2023-11-03
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: Defect control in the Heisenberg-Kitaev candidate material NaRuO$_2$

    Ortiz, Brenden R. / Sarte, Paul M. / Avidor, Alon H. / Wilson, Stephen D.

    2022  

    Abstract: The combination of geometric frustration, extended hopping, spin-orbit coupling, and a disordered magnetic ground state make NaRuO$_{2}$ an attractive Heisenberg-Kitaev candidate material. Historically, NaRuO$_2$ has been a challenging material to ... ...

    Abstract The combination of geometric frustration, extended hopping, spin-orbit coupling, and a disordered magnetic ground state make NaRuO$_{2}$ an attractive Heisenberg-Kitaev candidate material. Historically, NaRuO$_2$ has been a challenging material to produce, even in polycrystalline form. Here we present synthetic efforts that identify a propensity for Na$_\text{Ru}$ defects to form in NaRuO$_2$, revealing a full solid-solution between NaRuO$_{2}$ and disordered Na$_2$RuO$_3$. We report the synthesis of alloys along the Na$_{3+x}$Ru$_{3-x}$O$_6$ solid solution and characterize changes in the bulk magnetization and electron transport as a function of Na-loading. Our results highlight the importance of stoichiometry control in NaRuO$_{2}$ when investigating and interpreting this material's physical properties.
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Publishing date 2022-08-05
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Book ; Online: Incommensurate Magnetic Order in the $\mathbb{Z}_2$ Kagome Metal GdV$_6$Sn$_6$

    Porter, Zach / Pokharel, Ganesh / Kim, Jong-Woo / Ryan, Phillip J. / Wilson, Stephen D.

    2023  

    Abstract: We characterize the magnetic ground state of the topological kagome metal GdV$_6$Sn$_6$ via resonant X-ray diffraction. Previous magnetoentropic studies of GdV$_6$Sn$_6$ suggested the presence of a modulated magnetic order distinct from the ... ...

    Abstract We characterize the magnetic ground state of the topological kagome metal GdV$_6$Sn$_6$ via resonant X-ray diffraction. Previous magnetoentropic studies of GdV$_6$Sn$_6$ suggested the presence of a modulated magnetic order distinct from the ferromagnetism that is easily polarized by the application of a magnetic field. Diffraction data near the Gd-$L_2$ edge directly resolve a $c$-axis modulated spin structure order on the Gd sublattice with an incommensurate wave vector that evolves upon cooling toward a partial lock-in transition. While equal moment (spiral) and amplitude (sine) modulated spin states can not be unambiguously discerned from the scattering data, the overall phenomenology suggests an amplitude modulated state with moments predominantly oriented in the $ab$-plane. Comparisons to the ``double-flat" spiral state observed in Mn-based $R$Mn$_6$Sn$_6$ kagome compounds of the same structure type are discussed.

    Comment: 5 pages, 4 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2023-06-27
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Advances in high-pressure laser floating zone growth: The Laser Optical Kristallmacher II (LOKII).

    Gomez Alvarado, Steven J / Zoghlin, Eli / Jackson, Azzedin / Kautzsch, Linus / Plumb, Jayden / Aling, Michael / Capa Salinas, Andrea N / Pokharel, Ganesh / Pang, Yiming / Gomez, Reina M / Daly, Samantha / Wilson, Stephen D

    The Review of scientific instruments

    2024  Volume 95, Issue 3

    Abstract: The optical floating zone crystal growth technique is a well-established method for obtaining large, high-purity single crystals. While the floating zone method has been constantly evolving for over six decades, the development of high-pressure (up to ... ...

    Abstract The optical floating zone crystal growth technique is a well-established method for obtaining large, high-purity single crystals. While the floating zone method has been constantly evolving for over six decades, the development of high-pressure (up to 1000 bar) growth systems has only recently been realized via the combination of laser-based heating sources with an all-metal chamber. While our inaugural high-pressure laser floating zone furnace design demonstrated the successful growth of new volatile and metastable phases, the furnace design faces several limitations with imaging quality, heating profile control, and chamber cooling power. Here, we present a second-generation design of the high-pressure laser floating zone furnace, "Laser Optical Kristallmacher II" (LOKII), and demonstrate that this redesign facilitates new advances in crystal growth by highlighting several exemplar materials: α-Fe2O3, β-Ga2O3, and La2CuO4+δ. Notably, for La2CuO4+δ, we demonstrate the feasibility and long-term stability of traveling solvent floating zone growth under a record pressure of 700 bar.
    Language English
    Publishing date 2024-03-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0186528
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    In stock of ZB MED Bonn / Germany

    Z 4' 46/112: Show issues

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  9. Article ; Online: Absence of local moments in the kagome metal KV

    Kenney, Eric M / Ortiz, Brenden R / Wang, Chennan / Wilson, Stephen D / Graf, Michael J

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

    2021  Volume 33, Issue 23

    Abstract: We have carried out muon spin relaxation and rotation measurements on the newly discovered kagome metal ... ...

    Abstract We have carried out muon spin relaxation and rotation measurements on the newly discovered kagome metal KV
    Language English
    Publishing date 2021-05-10
    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/abe8f9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Imaging antiferromagnetic domain fluctuations and the effect of atomic scale disorder in a doped spin-orbit Mott insulator.

    Zhao, He / Porter, Zach / Chen, Xiang / Wilson, Stephen D / Wang, Ziqiang / Zeljkovic, Ilija

    Science advances

    2021  Volume 7, Issue 46, Page(s) eabi6468

    Abstract: Correlated oxides can exhibit complex magnetic patterns. Understanding how magnetic domains form in the presence of disorder and their robustness to temperature variations has been of particular interest, but atomic scale insight has been limited. We use ...

    Abstract Correlated oxides can exhibit complex magnetic patterns. Understanding how magnetic domains form in the presence of disorder and their robustness to temperature variations has been of particular interest, but atomic scale insight has been limited. We use spin-polarized scanning tunneling microscopy to image the evolution of spin-resolved modulations originating from antiferromagnetic (AF) ordering in a spin-orbit Mott insulator perovskite iridate Sr
    Language English
    Publishing date 2021-11-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.abi6468
    Database MEDical Literature Analysis and Retrieval System OnLINE

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