1
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Peng S, Wang Q, Huang X, Hao N. The multiple topological phases in a new family of compounds ACrTe (A = Na, K, Rb, Cs) predicted by first-principles calculations. Phys Chem Chem Phys 2024; 26:23288-23296. [PMID: 39196642 DOI: 10.1039/d4cp02235a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2024]
Abstract
Based on first-principles calculations, we predict a new family of chromium-based compounds, ACrTe (A = Na, K, Rb, Cs), which share the same structure as the iron-based superconductor LiFeAs. We show that all these materials are narrow-gap antiferromagnetic (AFM) semiconductors. The AFM order is of the checkerboard type within Cr layers, while the interlayer coupling changes from ferromagnetic (FM) for NaCrTe to AFM for KCrTe, RbCrTe and CsCrTe. Interestingly, we find that the small gap is sensitive to in-plane biaxial strain and magnetic fields, which can tune the bulk compounds to become Dirac and Weyl semimetals and tune the monolayer case to exhibit quantum spin and anomalous Hall effects. Significantly, both Dirac and Weyl semimetals show clean topological structures with a long-sought single pair of Dirac and Weyl points at the Fermi level. Our studies may provide an ideal candidate material to study Dirac and Weyl physics and to realize clean quantum spin and anomalous Hall effects.
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Affiliation(s)
- Shuaiqi Peng
- Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Qing Wang
- Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xinliang Huang
- Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Ning Hao
- Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
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2
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Ishtiyak M, Watts SR, Thipe B, Womack F, Adams P, Bai X, Young DP, Bobev S, Baranets S. Advancing Heteroanionicity in Zintl Phases: Crystal Structures, Thermoelectric and Magnetic Properties of Two Quaternary Semiconducting Arsenide Oxides, Eu 8Zn 2As 6O and Eu 14Zn 5As 12O. Inorg Chem 2024. [PMID: 38904454 DOI: 10.1021/acs.inorgchem.4c01580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Two novel quaternary oxyarsenides, Eu8Zn2As6O and Eu14Zn5As12O, were synthesized through metal flux reactions, and their crystal structures were established by single-crystal X-ray diffraction methods. Eu8Zn2As6O crystallizes in the orthorhombic space group Pbca, featuring polyanionic ribbons composed of corner-shared triangular [ZnAs3] units, running along the [100] direction. The structure of Eu14Zn5As12O crystallizes in the monoclinic space group P2/m and its anionic substructure can be described as an infinite "ribbonlike" chain comprised of [ZnAs3] trigonal-planar units, although the structural complexity here is greater and also amplified by disorder on multiple crystallographic positions. In both structures, the O2- anion occupies an octahedral void with six neighboring Eu2+ cations. Formal electron counting, electronic structure calculations, and transport properties reveal the charge-balanced semiconducting nature of these heteroanionic Zintl phases. High-temperature thermoelectric transport properties measurements on Eu14Zn5As12O reveal relatively high resistivity (ρ500K = 8 Ω·cm) and Seebeck coefficient values (S500K = 220 μV K-1), along with a low concentration and mobility of holes as the dominant charge-carriers (n500K = 8.0 × 1017 cm-3, μ500K = 6.4 cm2/V s). Magnetic studies indicate the presence of divalent Eu2+ species in Eu14Zn5As12O and complex magnetic ordering, with two transitions observed at T1 = 21.6 K and T2 = 9 K.
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Affiliation(s)
- Mohd Ishtiyak
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Spencer R Watts
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Bhushan Thipe
- Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Frank Womack
- Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Philip Adams
- Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Xiaojian Bai
- Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - David P Young
- Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Svilen Bobev
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Sviatoslav Baranets
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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3
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Deng J, Pan J, Zhang YF, Du S. Database Construction of Two-Dimensional Charged Building Blocks for Functional-Oriented Material Design. NANO LETTERS 2023; 23:4634-4641. [PMID: 37146245 DOI: 10.1021/acs.nanolett.3c01237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Databases for charge-neutral two-dimensional (2D) building blocks (BBs), i.e., 2D materials, have been built for years due to their applications in nanoelectronics. Though lots of solids are constructed from charged 2DBBs, a database for them is still missing. Here, we identify 1028 charged 2DBBs from Materials Project database using a topological-scaling algorithm. These BBs host versatile functionalities including superconductivity, magnetism, and topological properties. We construct layered materials by assembling these BBs considering valence state and lattice mismatch and predict 353 stable layered materials by high-throughput density functional theory calculations. These materials can not only inherit their functionalities but also show enhanced/emergent properties compared with their parent materials: CaAlSiF displays superconducting transition temperature higher than NaAlSi; Na2CuIO6 shows bipolar ferromagnetic semiconductivity and anomalous valley Hall effect that are absent in KCuIO6; LaRhGeO possesses nontrivial band topology. This database expands the design space of functional materials for fundamental research and potential applications.
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Affiliation(s)
- Jun Deng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Jinbo Pan
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Yan-Fang Zhang
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shixuan Du
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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4
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Manopo J, Lubis TP, Maryono MAME, Arifin P, Winata T, Widita R, Darma Y. Strongly bound Wannier-Mott exciton in pristine (LaO)MnAs and origin of ferrimagnetism in F-doped (LaO)MnAs. RSC Adv 2023; 13:14033-14040. [PMID: 37181508 PMCID: PMC10167672 DOI: 10.1039/d3ra01506h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 04/23/2023] [Indexed: 05/16/2023] Open
Abstract
We study the electronic, magnetic, and optical properties of (LaO1-xFx)MnAs (x = 0, 0.0625, 0.125, 0.25) systems, calculated using the generalized gradient approximation (GGA) corrected by Hubbard energy (U) = 1 eV. For x = 0, this system shows equal bandgap (Eg) values for spin-up and spin-down of 0.826 eV, with antiferromagnetic (AFM) properties and local magnetic moment in the Mn site of 3.86 μB per Mn. By doping F with x = 0.0625, the spin-up and spin-down Eg values decrease to 0.778 and 0.798 eV, respectively. This system, along with antiferromagnetic properties, also has a local magnetic moment in the Mn site of 3.83 μB per Mn. Increasing doping F to x = 0.125 induces increases of Eg to 0.827 and 0.839 eV for spin-up and spin-down. However, the AFM remains, where μMn slightly decreases to 3.81 μB per Mn. Furthermore, the excess electron from the F ion induces the Fermi level to move toward the conduction band and changes the bandgap type from indirect bandgap (Γ → M) to direct bandgap (Γ → Γ). Increasing x to 25% induces the decrease of spin-up and spin-down Eg to 0.488 and 0.465 eV, respectively. This system shows that the AFM changes to ferrimagnetism (FIM) for x = 25%, with a total magnetic moment of 0.78 μB per cell, which is mostly contributed by Mn 3d and As 4p local magnetic moments. The change from AFM to FIM behavior results from competition between superexchange AFM ordering and Stoner's exchange ferromagnetic ordering. Pristine (LaO)MnAs exhibits high excitonic binding energy (∼146.5 meV) due to a flat band structure. Our study shows that doping F in the (LaO)MnAs system significantly modifies the electronic, magnetic, and optical properties for novel advanced device applications.
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Affiliation(s)
- Jessie Manopo
- Quantum Semiconductor and Devices Lab, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
- Physics of Electronic Materials Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
- Research Collaboration Center for Quantum Technology 2.0 Bandung 40132 Indonesia
| | - Tio Prince Lubis
- Quantum Semiconductor and Devices Lab, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
- Physics of Electronic Materials Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
| | - Muhammad Arief Mustajab Enha Maryono
- Physics of Electronic Materials Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
| | - Pepen Arifin
- Physics of Electronic Materials Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
| | - Toto Winata
- Physics of Electronic Materials Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
| | - Rena Widita
- Nuclear Physics and Biophysics Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
| | - Yudi Darma
- Quantum Semiconductor and Devices Lab, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
- Physics of Electronic Materials Research Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10 Bandung 40132 Indonesia
- Research Collaboration Center for Quantum Technology 2.0 Bandung 40132 Indonesia
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5
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Arah B, Ritter C, Stenning GBG, Mclaughlin AC. Magnetic Phase Separation in the Oxypnictide Sr 2Cr 1.85Mn 1.15As 2O 2. Inorg Chem 2022; 61:12518-12525. [PMID: 35926167 PMCID: PMC9387525 DOI: 10.1021/acs.inorgchem.2c00885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Layered Sr2M3As2O2-type
oxypnictides are composed of tetrahedral M2Pn2 and square planar MO2 layers, the building blocks of
iron-based and cuprate superconductors. To further expand our understanding
of the chemical and magnetic properties of the Sr2Cr3–xMnxAs2O2 solid solution, Sr2Cr2MnAs2O2 has been synthesized. The compound
crystallizes in the I4/mmm tetragonal
space group with a refined stoichiometry of Sr2Cr1.85Mn1.15As2O2. The M(2) site within
the M2Pn2 slab is occupied by 42.7% Cr and 57.3%
Mn, and the magnetic moments order antiferromagnetically below TN(M2) = 540 K with a C-type antiferromagnetic structure. The
M(1) site within the MO2 layers is fully occupied by Cr,
and antiferromagnetic order is observed below TN(M1) =
200 K. Along c, there are two possible interplanar
arrangements: ferromagnetic with the (1/2, 1/2, 0) propagation vector
and antiferromagnetic with the (1/2, 1/2, 1/2) propagation vector.
Magnetic phase separation arises so that both propagation vectors
are observed below 200 K. Such magnetic phase separation has not been
previously observed in Sr2M3As2O2 phases (M = Cr, Mn) and shows that there are several competing
magnetic structures present in these compounds. Layered Sr2M3As2O2-type oxypnictides are composed of tetrahedral
M2Pn2 and square planar MO2 layers,
the building blocks
of iron-based and cuprate superconductors. Sr2Cr1.85Mn1.15As2O2 is antiferromagnetic
and semiconducting. Surprisingly magnetic phase segregation is observed
in the oxypnictide Sr2Cr1.85Mn1.15As2O2 because of competing magnetic exchange
interactions along c.
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Affiliation(s)
- Bor Arah
- The Chemistry Department, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, Scotland
| | - Clemens Ritter
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - Gavin B G Stenning
- ISIS, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, U. K
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6
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Sheath BC, Xu X, Manuel P, Hadermann J, Batuk M, O'Sullivan J, Bonilla RS, Clarke SJ. Structures and Magnetic Ordering in Layered Cr Oxide Arsenides Sr 2CrO 2Cr 2OAs 2 and Sr 2CrO 3CrAs. Inorg Chem 2022; 61:12373-12385. [PMID: 35895504 PMCID: PMC9364410 DOI: 10.1021/acs.inorgchem.2c01773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
![]()
Two novel chromium oxide arsenide materials have been
synthesized,
Sr2CrO2Cr2OAs2 (i.e.,
Sr2Cr3As2O3) and Sr2CrO3CrAs (i.e., Sr2Cr2AsO3), both of which contain chromium ions in two distinct layers.
Sr2CrO2Cr2OAs2 was targeted
following electron microscopy measurements on a related phase. It
crystallizes in the space group P4/mmm and accommodates distorted CrO4As2 octahedra
containing Cr2+ and distorted CrO2As4 octahedra containing Cr3+. In contrast, Sr2CrO3CrAs incorporates Cr3+ in CrO5 square-pyramidal coordination in [Sr2CrO3]+ layers and Cr2+ ions in CrAs4 tetrahedra
in [CrAs]− layers and crystallizes in the space
group P4/nmm. Powder neutron diffraction
data reveal antiferromagnetic ordering in both compounds. In Sr2CrO3CrAs the Cr2+ moments in the [CrAs]− layers exhibit long-range ordering, while the Cr3+ moments in the [Sr2CrO3]+ layers only exhibit short-range ordering. However, in Sr2CrO2Cr2OAs2, both the Cr2+ moments in the CrO4As2 environments and the
Cr3+ moments in the CrO2As4 polyhedra
are long-range-ordered below 530(10) K. Above this temperature, only
the Cr3+ moments are ordered with a Néel temperature
slightly in excess of 600 K. A subtle structural change is evident
in Sr2CrO2Cr2OAs2 below
the magnetic ordering transitions. Sr2CrO2Cr2OAs2 and Sr2CrO3CrAs are both mixed-anion materials
containing chromium ions in two unique layers. In Sr2CrO2Cr2OAs2, Cr3+ ions in CrO2As4 environments order antiferromagnetically at
around 600 K and Cr2+ ions in CrO4As2 environments also order antiferromagnetically at a lower temperature
of 530(10) K. In contrast, only the Cr2+ moments in the
[CrAs]− layers exhibit long-range ordering in Sr2CrO3CrAs as the Cr3+ moments in the
[Sr2CrO3]+ layers only exhibit short-range
ordering.
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Affiliation(s)
- Bradley C Sheath
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Xiaoyu Xu
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Pascal Manuel
- ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, United Kingdom
| | - Joke Hadermann
- Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Maria Batuk
- Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - John O'Sullivan
- Department of Materials, University of Oxford, Engineering and Technology Building, Parks Road, Oxford OX1 3PH, United Kingdom
| | - Ruy S Bonilla
- Department of Materials, University of Oxford, Engineering and Technology Building, Parks Road, Oxford OX1 3PH, United Kingdom
| | - Simon J Clarke
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom
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7
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Chen L, Zhao L, Qiu X, Zhang Q, Liu K, Lin Q, Wang G. Quasi-One-Dimensional Structure and Possible Helical Antiferromagnetism of RbMn 6Bi 5. Inorg Chem 2021; 60:12941-12949. [PMID: 34436872 DOI: 10.1021/acs.inorgchem.1c01318] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Quasi-one-dimensional materials exhibit not only unique crystal structure but also abundant physical properties such as charge density wave, Luttinger liquid, and superconductivity. Here we report the discovery, structure, and physical properties of a new manganese-based quasi-one-dimensional material RbMn6Bi5, which crystallizes in a monoclinic space group C2/m (No. 12) with lattice parameters a = 23.286(5) Å, b = 4.6215(9) Å, c = 13.631(3) Å, and β = 125.00(3)°. The structure features [Mn6Bi5]-1 double-walled column extending along the [010] direction, together with Bi-Bi homoatomic bonds linking the columns and the countercation Rb+. The temperature-dependent resistivity clearly indicates a significant resistivity anisotropy for RbMn6Bi5, whereas the magnetic susceptibility and specific heat measurements show that RbMn6Bi5 is antiferromagnetic below 82 K. The density functional theory calculations indicate that RbMn6Bi5 is a quasi-one-dimensional metal with possible helical antiferromagnetic configuration. The discovery of RbMn6Bi5 confirms the viability of discovering new quasi-one-dimensional materials in manganese-based compounds.
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Affiliation(s)
- Long Chen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Linlin Zhao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaole Qiu
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Kai Liu
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
| | - Qisheng Lin
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States.,Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Gang Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.,Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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8
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Widita R, Muhammady S, Prasetiyawati RD, Marlina R, Suryanegara L, Purnama B, Kurniadi R, Darma Y. Revisiting the Structural, Electronic, and Magnetic Properties of (LaO)MnAs: Effect of Hubbard Correction and Origin of Mott-Insulating Behavior. ACS OMEGA 2021; 6:4440-4447. [PMID: 33644556 PMCID: PMC7906576 DOI: 10.1021/acsomega.0c05889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 01/28/2021] [Indexed: 05/28/2023]
Abstract
We study the structural, electronic, and magnetic properties of the antiferromagnetic-layered oxyarsenide (LaO)MnAs system from the first-principle calculation. The increasing Hubbard energy (U) in the Mn 3d orbital induces the increasing local-symmetry distortions (LSDs) in MnAs4 and OLa4 tetrahedra. The LSD in MnAs4 tetrahedra is possibly promoted by the second-order Jahn-Teller effect in the Mn 3d orbital. Furthermore, the increasing U also escalates the bandgap (E g) and the magnetic moment of Mn (μMn). The value of U = 1 eV is the most appropriate by considering the structural properties. This value leads to E g and μMn of 0.834 eV and 4.31 μB, respectively. The calculated μMn is lower than the theoretical value for the high-spin state of Mn 3d (5 μB) due to the hybridization between Mn 3d and As 4p states. However, d xy states are localized and show the weakest hybridization with valence As 4p states. The Mott-insulating behavior in the system is characterized by the E g transition between the valence and conduction d zx /d zy states. This work shows new physical insights for advanced functional device applications, such as spintronics.
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Affiliation(s)
- Rena Widita
- Department
of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
| | - Shibghatullah Muhammady
- Department
of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
| | - Rahma Dhani Prasetiyawati
- Department
of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
| | - Resti Marlina
- Research
Center for Biomaterials, Indonesian Institute
of Sciences, Jl. Raya Jakarta-Bogor KM 46 Cibinong, Bogor 16911, Indonesia
| | - Lisman Suryanegara
- Research
Center for Biomaterials, Indonesian Institute
of Sciences, Jl. Raya Jakarta-Bogor KM 46 Cibinong, Bogor 16911, Indonesia
| | - Budi Purnama
- Department
of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Ir. Sutami 36, Surakarta 57126, Indonesia
| | - Rizal Kurniadi
- Department
of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
| | - Yudi Darma
- Department
of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
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9
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Zhang F, Li B, Ren Q, Mao H, Xia Y, Hu B, Liu Z, Wang Z, Shao Y, Feng Z, Tan S, Sun Y, Ren Z, Jing Q, Liu B, Luo H, Ma J, Mei Y, Wang C, Cao GH. ThMnPnN (Pn = P, As): Synthesis, Structure, and Chemical Pressure Effects. Inorg Chem 2020; 59:2937-2944. [PMID: 32064866 DOI: 10.1021/acs.inorgchem.9b03294] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mn-based ZrCuSiAs-type pnictides ThMnPnN (Pn = P, As) containing PbO-type Th2N2 layers were synthesized. The crystal and magnetic structures are determined using X-ray and neutron powder diffraction. While neutron diffraction indicates a C-type antiferromagnetic state at 300 K, the temperature dependence of the magnetic susceptibility shows cusps at 36 and 52 K respectively for ThMnPN and ThMnAsN. The susceptibility cusps are ascribed to a spontaneous antiferromagnetic-to-antiferromagnetic transition for Mn2+ moments, which is observed for the first time in Mn-based ZrCuSiAs-type compounds. In addition, measurements of the resistivity and specific heat suggest an abnormal increase in the density of states at the Fermi energy. The result is discussed in terms of the internal chemical pressure effect.
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Affiliation(s)
- Fuxiang Zhang
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Baizhuo Li
- Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China
| | - Qingyong Ren
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Huican Mao
- Department of Physics and Center for Advanced Quantum Studies, Beijing Normal University, Beijing 100875, P. R. China.,Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Yuanhua Xia
- Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, P. R. China
| | - Bingfeng Hu
- Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, P. R. China
| | - Zichen Liu
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Zhicheng Wang
- Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China
| | - Yeting Shao
- Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China
| | - Zhifa Feng
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Shugang Tan
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Yuping Sun
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Zhi Ren
- Institute for Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310027, P. R. China
| | - Qiang Jing
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Bo Liu
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Huiqian Luo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Jie Ma
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Yuxue Mei
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Cao Wang
- School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Guang-Han Cao
- Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China
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10
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Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams. Sci Rep 2018; 8:4019. [PMID: 29507317 PMCID: PMC5838113 DOI: 10.1038/s41598-018-22234-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 02/15/2018] [Indexed: 12/04/2022] Open
Abstract
We report localization of a magnetic dichroic signal on atomic columns in electron magnetic circular dichroism (EMCD), probed by beam distorted by four-fold astigmatism and electron vortex beam. With astigmatic probe, magnetic signal to noise ratio can be enhanced by blocking the intensity from the central part of probe. However, the simulations show that for atomic resolution magnetic measurements, vortex beam is a more effective probe, with much higher magnetic signal to noise ratio. For all considered beam shapes, the optimal SNR constrains the signal detection at low collection angles of approximately 6–8 mrad. Irrespective of the material thickness, the magnetic signal remains strongly localized within the probed atomic column with vortex beam, whereas for astigmatic probes, the magnetic signal originates mostly from the nearest neighbor atomic columns. Due to excellent signal localization at probing individual atomic columns, vortex beams are predicted to be a strong candidate for studying the crystal site specific magnetic properties, magnetic properties at interfaces, or magnetism arising from individual atomic impurities.
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Plokhikh I, Charkin D, Verchenko V, Kuznetsov A, Tsirlin A, Kazakov S, Shevelkov A. Synthesis, crystal structure and physical properties of europium – manganese fluoride pnictides, EuMnPnF (Pn = P, As, Sb). J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2017.12.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Idrobo JC, Rusz J, Spiegelberg J, McGuire MA, Symons CT, Vatsavai RR, Cantoni C, Lupini AR. Detecting magnetic ordering with atomic size electron probes. ACTA ACUST UNITED AC 2016. [DOI: 10.1186/s40679-016-0019-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
AbstractAlthough magnetism originates at the atomic scale, the existing spectroscopic techniques sensitive to magnetic signals only produce spectra with spatial resolution on a larger scale. However, recently, it has been theoretically argued that atomic size electron probes with customized phase distributions can detect magnetic circular dichroism. Here, we report a direct experimental real-space detection of magnetic circular dichroism in aberration-corrected scanning transmission electron microscopy (STEM). Using an atomic size-aberrated electron probe with a customized phase distribution, we reveal the checkerboard antiferromagnetic ordering of Mn moments in LaMnAsO by observing a dichroic signal in the Mn L-edge. The novel experimental setup presented here, which can easily be implemented in aberration-corrected STEM, opens new paths for probing dichroic signals in materials with unprecedented spatial resolution.
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Wildman EJ, Mclaughlin AC. A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO0.95F0.05. Sci Rep 2016; 6:20705. [PMID: 26875693 PMCID: PMC4753427 DOI: 10.1038/srep20705] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 01/11/2016] [Indexed: 11/22/2022] Open
Abstract
The recent discovery of high temperature superconductivity in Fe arsenides has invigorated research into transition metal pnictides. Colossal magnetoresistance (CMR) has recently been reported for NdMnAsO1-xFx for x = 0.05–0.08, with a maximum magnetoresistance achieved at low temperature (MR9T(3 K)) = −95%). This appears to be a novel mechanism of CMR, which is as a result of a second order phase transition in field from an insulating antiferromagnet to a semiconducting paramagnet. Here we report a variable temperature synchrotron X-ray powder diffraction study of the CMR oxypnictide NdMnAsO0.95F0.05 between 4 K–290 K. An excellent fit to the tetragonal unit cell with space group P4/nmm is obtained over the entire temperature range, with no change in crystal structure detected down to 4 K. A coupling of the lattice and magnetic order is observed, where subtle discontinuities in the temperature variation of a and the c/a ratio are apparent as the Nd spins order antiferromagnetically and the Mn moments reorient into the basal plane at TSR. The results suggest that very small changes in lattice parameters effect the coupling between lattice, electronic and magnetic degrees of freedom.
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Affiliation(s)
- E J Wildman
- The Chemistry Department, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, Scotland
| | - A C Mclaughlin
- The Chemistry Department, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, Scotland
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Wildman EJ, Tucker MG, Mclaughlin AC. A high pressure neutron study of colossal magnetoresistant NdMnAsO(0.95)F(0.05). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:116001. [PMID: 25721358 DOI: 10.1088/0953-8984/27/11/116001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A high pressure neutron diffraction study of the oxypnictide NdMnAsO0.95F0.05 has been performed at temperatures of 290-383 K and pressures up to 8.59 GPa. The results demonstrate that the antiferromagnetic order of the Mn spins is robust to pressures of up to 8.59 GPa. TN is enhanced from 360 to 383 K upon applying an external pressure of 4.97 GPa, a rate of 4.63 K GPa(-1). NdMnAsO0.95F0.05 is shown to violate Bloch's rule which would suggest that NdMnAsO0.95F0.05 is on the verge of a localized to itinerant transition. There is no evidence of a structural transition but applied pressure tends to result in more regular As-Mn-As and Nd-O-Nd tetrahedra. The unit cell is significantly more compressible along the c-axis than the a-axis, as the interlayer coupling is weaker than the intrinsic bonds contained within NdO and MnAs slabs.
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Affiliation(s)
- E J Wildman
- The Chemistry Department, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, Scotland, UK
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Wildman EJ, Sher F, Mclaughlin AC. Absence of colossal magnetoresistance in the oxypnictide PrMnAsO0.95F0.05. Inorg Chem 2015; 54:2536-42. [PMID: 25713929 DOI: 10.1021/ic502445t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have recently reported a new mechanism of colossal magnetoresistance (CMR) in electron doped manganese oxypnictides NdMnAsO1-xFx. Magnetoresistances of up to -95% at 3 K have been observed. Here we show that upon replacing Nd for Pr, the CMR is surprisingly no longer present. Instead a sizable negative magnetoresistance is observed for PrMnAsO0.95F0.05 below 35 K (MR7T (12 K) = -13.4% for PrMnAsO0.95F0.05). A detailed neutron and synchrotron X-ray diffraction study of PrMnAsO0.95F0.05 has been performed, which shows that a structural transition, Ts, occurs at 35 K from tetragonal P4/nmm to orthorhombic Pmmn symmetry. The structural transition is driven by the Pr 4f electrons degrees of freedom. The sizable -MR observed below the transition most likely arises due to a reduction in magnetic and/or multipolar scattering upon application of a magnetic field.
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Affiliation(s)
- Eve J Wildman
- The Chemistry Department, University of Aberdeen , Meston Walk, Aberdeen AB24 3UE, Scotland
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Li X, Wu X, Yang J. Room-Temperature Half-Metallicity in La(Mn,Zn)AsO Alloy via Element Substitutions. J Am Chem Soc 2014; 136:5664-9. [DOI: 10.1021/ja412317s] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xingxing Li
- Hefei National Laboratory for Physical Science at the Microscale, ‡CAS Key Laboratory of Materials for Energy Conversion and Department of Materials Science and Engineering, and §Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China
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Wildman EJ, Skakle JMS, Emery N, Mclaughlin AC. Colossal Magnetoresistance in Mn2+ Oxypnictides NdMnAsO1–xFx. J Am Chem Soc 2012; 134:8766-9. [DOI: 10.1021/ja302328t] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eve J. Wildman
- Department of Chemistry, University of Aberdeen, Meston Walk,
Aberdeen AB24 3UE, U.K
| | - Janet M. S. Skakle
- Department of Chemistry, University of Aberdeen, Meston Walk,
Aberdeen AB24 3UE, U.K
| | - Nicolas Emery
- Institut de Chimie
et des Materiaux Paris Est, ICMPE/GESMAT, UMR 7182 CNRS-Universite Paris Est Creteil, CNRS 2
rue Henri Dunant, 94320 Thiais, France
| | - Abbie C. Mclaughlin
- Department of Chemistry, University of Aberdeen, Meston Walk,
Aberdeen AB24 3UE, U.K
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