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Wei XK, Bihlmayer G, Zhou X, Feng W, Kolen'ko YV, Xiong D, Liu L, Blügel S, Dunin-Borkowski RE. Discovery of Real-Space Topological Ferroelectricity in Metallic Transition Metal Phosphides. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2003479. [PMID: 33029890 DOI: 10.1002/adma.202003479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 08/21/2020] [Indexed: 06/11/2023]
Abstract
Ferroelectric metals-with coexisting ferroelectricity and structural asymmetry-challenge traditional perceptions because free electrons screen electrostatic forces between ions, the driving force of breaking the spatial inversion symmetry. Despite ferroelectric metals having been unveiled one after another, topologically switchable polar objects with metallicity have never been identified so far. Here, the discovery of real-space topological ferroelectricity in metallic and non-centrosymmetric Ni2 P is reported. Protected by the rotation-inversion symmetry operation, it is found that the balanced polarity of alternately stacked polyhedra couples intimately with elemental valence states, which are verified using quantitative electron energy-loss spectroscopy. First-principles calculations reveal that an applied in-plane compressive strain creates a tunable bilinear double-well potential and reverses the polyhedral polarity on a unit-cell scale. The dual roles of nickel cations, including polar displacement inside polyhedral cages and a 3D bonding network, facilitate the coexistence of topological polarity with metallicity. In addition, the switchable in-plane polyhedral polarity gives rise to a spin-orbit-coupling-induced spin texture with large momentum-dependent spin splitting. These findings point out a new direction for exploring valence-polarity-spin correlative interactions via topological ferroelectricity in metallic systems with structural asymmetry.
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Affiliation(s)
- Xian-Kui Wei
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany
| | - Gustav Bihlmayer
- Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich GmbH and JARA, Jülich, 52425, Germany
| | - Xiaodong Zhou
- Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing, 100081, China
| | - Wanxiang Feng
- Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing, 100081, China
| | - Yury V Kolen'ko
- International Iberian Nanotechnology Laboratory (INL), Braga, 4715-330, Portugal
| | - Dehua Xiong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China
| | - Lifeng Liu
- International Iberian Nanotechnology Laboratory (INL), Braga, 4715-330, Portugal
| | - Stefan Blügel
- Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich GmbH and JARA, Jülich, 52425, Germany
| | - Rafal E Dunin-Borkowski
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich GmbH, Jülich, 52425, Germany
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Hu YJ, Zhao G, Zhang B, Yang C, Zhang M, Liu ZK, Qian X, Qi L. Local electronic descriptors for solute-defect interactions in bcc refractory metals. Nat Commun 2019; 10:4484. [PMID: 31578329 PMCID: PMC6775119 DOI: 10.1038/s41467-019-12452-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Accepted: 09/09/2019] [Indexed: 11/09/2022] Open
Abstract
The interactions between solute atoms and crystalline defects such as vacancies, dislocations, and grain boundaries are essential in determining alloy properties. Here we present a general linear correlation between two descriptors of local electronic structures and the solute-defect interaction energies in binary alloys of body-centered-cubic (bcc) refractory metals (such as W and Ta) with transition-metal substitutional solutes. One electronic descriptor is the bimodality of the d-orbital local density of states for a matrix atom at the substitutional site, and the other is related to the hybridization strength between the valance sp- and d-bands for the same matrix atom. For a particular pair of solute-matrix elements, this linear correlation is valid independent of types of defects and the locations of substitutional sites. These results provide the possibility to apply local electronic descriptors for quantitative and efficient predictions on the solute-defect interactions and defect properties in alloys.
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Affiliation(s)
- Yong-Jie Hu
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Ge Zhao
- Department of Statistics, Pennsylvania State University, State College, PA, 16802, USA
| | - Baiyu Zhang
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Chaoming Yang
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Mingfei Zhang
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Zi-Kui Liu
- Department of Materials Science and Engineering, Pennsylvania State University, State College, PA, 16802, USA
| | - Xiaofeng Qian
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Liang Qi
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA.
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Göpel W. Magnetic Structures and Stresses in Thin Films II. Thermodynamical Treatment and Discussion. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19780821002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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He K, Hirahara T, Okuda T, Hasegawa S, Kakizaki A, Matsuda I. Spin polarization of quantum well states in Ag films induced by the Rashba effect at the surface. PHYSICAL REVIEW LETTERS 2008; 101:107604. [PMID: 18851258 DOI: 10.1103/physrevlett.101.107604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2008] [Indexed: 05/26/2023]
Abstract
The electronic structure of Ag(111) quantum well films covered with a (sqrt[3]xsqrt[3]) R30 degrees Bi/Ag surface ordered alloy, which shows a Rashba spin-split surface state, is investigated with angle-resolved photoemission spectroscopy. The band dispersion of the spin-split surface state is significantly modified by the interaction with the quantum well states of Ag films. The interaction is well described by the band hybridization model, which concludes the spin polarization of the quantum well states.
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Affiliation(s)
- Ke He
- Institute for Solid State Physics (ISSP), the University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8581, Japan
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Potapov PL, Kulkova SE, Schryvers D. Study of changes in L32 EELS ionization edges upon formation of Ni-based intermetallic compounds. J Microsc 2003; 210:102-9. [PMID: 12694423 DOI: 10.1046/j.1365-2818.2003.01176.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
EELS L32 ionization edges in several Ni-based intermetallic compounds have been studied and interpreted in terms of the distribution of electrons in the valence d-bands. It is demonstrated that the integral EELS cross-sections change only slightly upon the formation of intermetallic compounds and therefore the charge transfer between atoms is negligible. On the other hand, the changes in the fine energy-loss near-edge structure (ELNES) of the Ni L3 edge can be readily detected indicating an important redistribution of d-electrons at the Ni site with alloying. These features are well reproduced by ab-initio calculations with a FLAPW method in its WIEN97 implementation. In contrast to the drastic effect of chemical environment, structural transformations in the investigated intermetallics result in smaller ELNES changes, which can be detected by only exceptional instruments with a higher energy resolution.
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Affiliation(s)
- P L Potapov
- EMAT, University of Antwerp, RUCA, Groenenborgerlaan 171, Belgium.
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Demangeat C. Energie d'interaction entre deux impuret$eacute$s dans une matrice de transition-application aux alliages de nickel. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/0305-4608/1/6/308] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gautier F. The pseudopotential theory and the impurity problem in transition and noble metals. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/0305-4608/1/4/311] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Comly JB, Holden TM, Low GG. The magnetic disturbances associated with substitutional impurities in nickel. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/0022-3719/1/2/319] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hubbard J, Dalton NW. The approximate calculation of electronic band structures II. Application to copper and iron. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/0022-3719/1/6/321] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Pettifor DG. An energy-independent method of band-structure calculation for transition metals. ACTA ACUST UNITED AC 2002. [DOI: 10.1088/0022-3719/2/6/316] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Pettifor DG. First principle basis functions and matrix elements in the H-NFE-TB representation. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/5/2/003] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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House D, Smith PV, Gyorffy BL. Cluster calculations of the soft X-ray L3emission spectra of nickel and copper. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/3/4/016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Gomes AA, Guimaraes AP. Magnetic properties and electronic structure of rare earth-transition metal intermetallic compounds. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/4/9/017] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Dalton NW. Approximate calculation of electronic band structures. IV. Density of states for transition metals. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/3/9/010] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Clark DG, Young W. Magnetic susceptibilities in the itinerant model: Many-band effects. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/7/17/019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Evans S, Pritchard RG, Thomas JM. Escape depths of X-ray (MgKα)-induced photoelectrons and relative photoionization cross sections for the 3p subshell of the elements of the first long period. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3719/10/13/022] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Riedinger R, Nauciel-Bloch M. On the magnetic susceptibilities in disordered alloys. II. Multi orbital case, spin wave stiffness constant. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/5/4/017] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Moriarty JA. Equivalence of resonance and tight binding descriptions of the d band in transition metals. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/5/5/007] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Gunnarsson O. Band model for magnetism of transition metals in the spin-density-functional formalism. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/6/4/018] [Citation(s) in RCA: 431] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Richardson D, Hisscott LA. Many-electron structure in the XPS spectra of some transition metals and alloys. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/6/4/009] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Edwards DM, Hill DJ. Theory of the spin wave stiffness constant in ferromagnetic transition metal alloys. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/6/4/019] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hennion B, Hennion M. Stiffness constant of strong ferromagnetic Ni-based alloys measurements in NiCo-interpretation within band models. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/9/3/017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bross H. Pseudopotential theory of the dielectric function of Al-the volume plasmon dispersion. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/8/12/022] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Smith PV. The electronic structure of dilute transitional impurities in transition and noble metal hosts. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0305-4608/8/7/014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Eibler R, Neckel A. The density-of-states functions of the ordered alloys FeAl, CoAl and NiAl and their relation to experimental data; calculations of the imaginary part of the complex dielectric function. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4608/10/10/015] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Stupfel B, Gautier F. Phonon spectra in the Frolich approach-application to the transition metals. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4608/12/8/006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sigfusson TI, Bernhoeft NR, Lonzarich GG. The de Haas-van Alphen effect, exchange splitting and Curie temperature in the weak itinerant ferromagnetic Ni3Al. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4608/14/9/019] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Starnberg HI, Nilsson PO. Experimental self-energy corrections to the Ni valence band. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4608/18/11/001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Presilla C, Sacchetti F. Auger spectra of 3d transition metals with orbital degeneracy. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0305-4608/17/3/021] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Cho EJ, Lee S, Oh S, Han M, Lee YS, Whang CN. Unoccupied states and charge transfer in Cu-Pd alloys studied by bremsstrahlung isochromat spectroscopy, x-ray photoelectron spectroscopy, and LIII absorption spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:16443-16450. [PMID: 9981043 DOI: 10.1103/physrevb.52.16443] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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