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Search Publications by: Craig Brown (Fed)

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Displaying 26 - 50 of 158

Spin Reorientation in Antiferromagnetic Layered FePt5P

July 30, 2021
Author(s)
Xin Gui, Madalynn Marshall, Ranuri Dissanayaka Mudiyanselage, Ryan Klein, Qiang Chen, Qiang Zhang, William Shelton, Haidong Zhou, Craig Brown, Huibo Cao, Martha Greenblatt, Weiwei Xie
FePt5P, a new substitutional variant of the CeCoIn5 structure type in space group P4/mmm, was synthesized by high-temperature solid-state method and structurally characterized by X-ray diffraction. FePt5P contains layers of FePt12 clusters formed by

Antiferromagnetic Order and Spin-Canting Transition in the Corrugated Square Net Compound Cu 3 (TeO 4 )(SO 4 ):H 2 O

July 19, 2021
Author(s)
Zhi-Cheng Wang, Kulatheepan Thanabalasingam, Jan P. Scheifers, Alenna Streeter, Gregory T. McCandless, Jonathan N. Gaudet, Craig Brown, Carlo U. Segre, Julia Y. Chan, Fazel Tafti
Strongly correlated electrons in layered perovskite structures have been the birthplace of high-temperature superconductivity, spin liquid, and quantum criticality. Specifically, the cuprate materials with layered structures made of corner sharing square

Magnetic Structure, Excitations and Short-Range order in Honeycomb Na 2 Ni 2 TeO 6

July 15, 2021
Author(s)
Nathan Episcopo, Po-Hao Chang, Thomas W. Heitmann, Kinley Wangmo, James M. Guthrie, Magdalena Fitta, Ryan Klein, Narayan Poudel, Krzysztof Gofryk, Rajendra R. Zope, Craig Brown, Harikrishnan S. Nair
Na 2Ni 2TeO 6 has a layered hexagonal structure with a honeycomb lattice constituted by Ni 2+ and a chiral charge distribution of Na + that resides between the Ni layers. In the present work, the antiferromagnetic transition temperature of Na 2Ni 2TeO 6 is

Ambient-Temperature Hydrogen Storage via Vanadium(II)-Dihydrogen Complexation in a Metal-Organic Framework

April 28, 2021
Author(s)
David Jaramillo, Henry Jiang, Hayden Evans, Romit Chakraborty, Hiroyasu Furukawa, Craig Brown, Martin Head-Gordon, Jeffrey Long
The widespread implementation of H 2 as a fuel is currently hindered by the high pressures or cryogenic temperatures required to achieve reasonable storage densities. In contrast, the realization of materials that strongly and reversibly adsorb hydrogen at

Neel Ordering in the Distorted Honeycomb Pyrosilicate: C-Er 2 Si 2 O 7

January 18, 2021
Author(s)
Gavin Hester, T. N. DeLazzer, S. S. Lim, Craig Brown, K. A. Ross
The rare-earth pyrosilicate family of compounds (RE 2Si 2O 7) hosts a variety of polymorphs, some with honeycomb-like geometries of the rare-earth sublattices, and the magnetism has yet to be deeply explored in many of the cases. Here we report on the

Chemical Bonding Governs Complex Magnetism in MnPt 5 P

January 14, 2021
Author(s)
Xin Gui, Ryan Klein, Craig Brown, Weiwei Xie
Subtle changes in chemical bonds may result in dramatic revolutions in magnetic properties in solid state materials. MnPt 5P, a new derivative of the rare-earth-free ferromagnetic MnPt5As, was discovered and is presented in this work. MnPt 5P was

Structural resolution and mechanistic insight into hydrogen adsorption in flexible ZIF-7

January 1, 2021
Author(s)
Ryan Klein, Sarah Shulda, Philip Parilla, Pierre Le Maqueres, Rachelle Richardson, William Morris, Craig Brown, C. Michael McGuirk
Flexible metal–organic frameworks offer a route towards high useable hydrogen storage capacities with minimal swings in pressure and temperature via step-shaped adsorption and desorption profiles. Yet, the understanding of hydrogen-induced flexibility in

Competing Antiferromagnetic-Ferromagnetic States in d 7 Kitaev Honeycomb Magnet

December 14, 2020
Author(s)
Hector Vivanco, Benjamin Trump, Craig Brown, Tyrel M. McQueen
The Kitaev model is a rare example of an analytically solvable and physically instantiable Hamiltonian yielding a topological quantum spin liquid ground state. Here we report signatures of Kitaev spin liquid physics in the honeycomb magnet Li 3Co 2SbO 6

Strain-Induced Creation and Switching of Anion Vacancy Layers in Perovskite Oxynitrides

November 23, 2020
Author(s)
Takafumi Yamamoto, Akira Chikamatsu, Shunsaku Kitagawa, Nana Izumo, Shunsuke Yamashita, Hiroshi Takatsu, Masayuki Ochi, Takahiro Maryuama, Morito Namba, Wenhao Sun, Takahide Nakashima, Fumitaka Takeiri, Kotaro Fujii, Masatomo Yashima, Yuki Sugisawa, Masahito Sano, Yashushi Hirose, Daiichiro Sekiba, Craig Brown, Takashi Honda, Kazutaka Ikeda, Toshiya Otomo, Kazuhiko Kuroki, Kenji Ishida, Takao Mori, Koji Kimoto, Tetsuya Hasegawa, Hiroshi Kageyama
Perovskite oxides, ABO 3, can host a variety of anion vacancies in the form of chains or layers, which results in various properties 1-3 and thus the manipulation of vacancy patterns is of considerable interest. Separately, lattice strain between thin-film

Peritectic Phase Transition of Benzene and Acetonitrile into a Cocrystal Relevant to Titan, Saturn's Moon

November 14, 2020
Author(s)
Christina A. McConville, Yunwen Tao, Hayden Evans, Benjamin Trump, Jonathan B. Lefton, Wenqian Xu, Andrey A. Yakovenko, Elfi Kraka, Craig Brown, Tomce Runcevski
Benzene and acetonitrile are two of the most commonly used solvents found in almost every chemical laboratory. Titan, Saturn's icy moon, is one other place in the Solar system that has even larger amounts of these compounds, together with many other

Dynamics of Hydroxyl Anions Promotes Lithium Ion Conduction in Antiperovskite Li 2 OHCl

October 13, 2020
Author(s)
Fei Wang, Hayden Evans, Kwangnam Kim, Liang Yin, Yiliang Li, Ping-Chun Tsai, Jue Liu, Saul H. Lapidus, Craig Brown, Donald J. Siegel, Yet-Ming Chiang
Li 2OHCl is an exemplar of the anti-perovskite family of ionic conductors, for which high ionic conductivities have been reported, but in which the atomic-level mechanism of ion migration is unclear. The stable phase is highly defective, having 1/3 of the

Elucidating the Structure of the Metal-Organic Framework Ru-HKUST-1

September 22, 2020
Author(s)
Gregory R. Lorzing, Krista P. Balto, Alexandra M. Antonio, Benjamin Trump, Craig Brown, Eric D. Bloch
Ru-HKUST-1 (Ru 3(btc) 2X 1.5; btc 3– = 1,3,5-benzentricarboxylate; X –^ = chloride, acetate, trimesate) has received considerable attention as a result of its structure type, tunability, and the redox-active nature of its constituent metal paddlewheel

Negative Cooperativity upon Hydrogen Bond-Stabilized O 2 Adsorption in a Redox-Active Metal-Organic Framework

June 18, 2020
Author(s)
Julia Oktawiec, Henry Z. H. Jiang, Jenny G. Vitillo, Douglas A. Reed, Lucy E. Darago, Benjamin Trump, Varinia Bernales, Harriet Li, Kristen A. Colwell, Hiroyasu Furukawa, Craig Brown, Laura Gagliardi, Jeffrey R. Long
The design of stable adsorbents capable of selectively capturing dioxygen with a high reversible capacity is a crucial goal in functional materials development. Drawing inspiration from biological O 2 carriers, we demonstrate that coupling metal-based

Inter-Kramers Transitions and Spin-Phonon Couplings in a Lanthanide-Based Single-Molecule Magnet

April 6, 2020
Author(s)
Duncan H. Moseley, Shelby E. Stavretis, Zhenhua Zhu, Mei Guo, Craig Brown, Mykhaylo Ozerov, Yongqiang Cheng, Luke L. Daemen, Rachael Richardson, Gary Knight, Komalavalli Thirunavukkuarasu, Anibal J. Ramirez-Cuesta, Jinkui Tang, Zi-Ling Xue
Spin-phonon coupling plays a critical role in magnetic relaxation in single-molecule magnets (SMMs) and molecular qubits. Yet, few studies of its nature have been conducted. Phonons here refer to both intermolecular and intramolecular vibrations. In the

Metastability and Reversibility of Anionic Redox-Based Cathode for High-Energy Rechargeable Batteries

March 25, 2020
Author(s)
Bao Qiu, Minghao Zhang, Seung-Yong Lee, Haodong Liu, Thomas A. Wynn, Lijun Wu, Yimei Zhu, Wen Wen, Craig Brown, Dong Zhou, Zhaoping Liu, Ying Shirley Meng
Great focus has been placed on the advancement of anionic redox, to which Li-rich layered oxide cathodes high capacities - currently exceeding 300 mAh g -1 - are attributed. With almost doubled capacity compared with present cathode materials, performance

Long-Range Magnetic Order in Hydroxide-Layer-Doped (Li 1-x-y Fe x Mn y OD)FeSe

March 11, 2020
Author(s)
Brandon Wilfong, Xiuquan Zhou, Huafei Zheng, Navneeth Babra, Craig Brown, Jeffrey W. Lynn, Keith M. Taddei, Johnpierre Paglione, Efrain E. Rodriguez
The (Li 1-xFe xOH)FeSe superconductor has been suspected to exhibit long-range magnetic ordering due to Fe substitution in the LiOH layer. However, no direct observation such as magnetic reflection from neutron diffraction has be reported. Here, we use a

Understanding How Ligand Functionalization Influences CO 2 and N 2 Adsorption in a Sodalite Metal-Organic Framework

February 25, 2020
Author(s)
Mehrdad Asgari, Rocio Semino, Pascal A. Schouwink, Ilia Kochetygov, Jacob D. Tarver, Olga Trukhina, Rajamani Krishna, Craig Brown, Michele Ceriotti, Wendy L. Queen
In this work, a detailed study is conducted to understand how ligand substitution influences the CO 2 and N 2 adsorption properties of two highly crystalline sodalite MOFs known as Cu-BTT (BTT -3= 1,3,5-benzenetristetrazolate) and Cu-BTTri (BTTri -3 = 1,3

Molecular Insight into Fluorocarbon Adsorption in Pore Expanded Metal-Organic Framework Analogs

February 12, 2020
Author(s)
Jian Zheng, Dushyant Barpaga, Benjamin Trump, Manish Shetty, Yanzhong Fan, Papri Bhattacharya, Jeromy J. Jenks, Cheng-Yong Su, Craig Brown, Guillaume Maurin, B. Peter McGrail, Radha Kishan Motkuri
The rapid growth in the global energy demand for space cooling requires the development of more efficient environmental chillers for which adsorption-based cooling systems can be utilized. Here in this contribution, we explore sorbents for chiller use via

Elusive Valence Transition in Mixed-Valence Sesquioxide Cs 4 O 6

November 4, 2019
Author(s)
Ross H. Colman, H. Esma Okur, Winfried Kockelmann, Craig Brown, Annette Sans, Claudia Felser, Martin Jansen, Kosmas Prassides
Cs 4O 6 is a mixed valence molecular oxide with a cubic structure, comprising valency-delocalized O 2 4/3- units and with properties highly sensitive to cooling protocols. Here we use neutron powder diffraction to authenticate that, while upon deep

Realization of Interlayer Ferromagnetic Interaction in MnSb 2 Te 4 toward the Magnetic Weyl Semimetal State

November 4, 2019
Author(s)
Taito Murakami, Yusuke Nambu, Takashi Koretsune, Gu Xiangyu, Takafumi Yamamoto, Craig Brown, Hiroshi Kageyama
Magnetism in the newly synthesized topological magnet Sb 2MnTe 4 is examined. Magnetic susceptibility, specific heat, and neutron diffraction measurements reveal a ferrimagnetic transition below 25 K, in contradiction to previous theoretical calculations