1
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Benshalom N, Asher M, Jouclas R, Korobko R, Schweicher G, Liu J, Geerts Y, Hellman O, Yaffe O. Phonon-Phonon Interactions in the Polarization Dependence of Raman Scattering. J Phys Chem C Nanomater Interfaces 2023; 127:18099-18106. [PMID: 37736293 PMCID: PMC10510386 DOI: 10.1021/acs.jpcc.3c03850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 08/17/2023] [Indexed: 09/23/2023]
Abstract
We have found that the polarization dependence of Raman scattering in organic crystals at finite temperatures can only be described by a fourth-rank tensor formalism. This generalization of the second-rank Raman tensor stems from the effect of off-diagonal components in the crystal self-energy on the light scattering mechanism. We thus establish a novel manifestation of phonon-phonon interaction in inelastic light scattering, markedly separate from the better-known phonon lifetime.
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Affiliation(s)
- Nimrod Benshalom
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Maor Asher
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Rémy Jouclas
- Laboratoire
de Chimie des Polymères, Universit́e
Libre de Bruxelles (ULB), Brussels 1050, Belgium
| | - Roman Korobko
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Guillaume Schweicher
- Laboratoire
de Chimie des Polymères, Universit́e
Libre de Bruxelles (ULB), Brussels 1050, Belgium
| | - Jie Liu
- Laboratoire
de Chimie des Polymères, Universit́e
Libre de Bruxelles (ULB), Brussels 1050, Belgium
| | - Yves Geerts
- Laboratoire
de Chimie des Polymères, Universit́e
Libre de Bruxelles (ULB), Brussels 1050, Belgium
- International
Solvay Institutes for Physics and Chemistry, Brussels 1050, Belgium
| | - Olle Hellman
- Department
of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-581 83, Sweden
- Department
of Molecular Chemistry and Material Science, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Omer Yaffe
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
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2
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Roller D, Rappe AM, Kronik L, Hellman O. Finite Difference Interpolation for Reduction of Grid-Related Errors in Real-Space Pseudopotential Density Functional Theory. J Chem Theory Comput 2023. [PMID: 37384777 DOI: 10.1021/acs.jctc.3c00217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
The real-space pseudopotential approach is a well-known method for large-scale density functional theory (DFT) calculations. One of its main limitations, however, is the introduction of errors associated with the positioning of the underlying real-space grid, a phenomenon usually known as the "egg-box" effect. The effect can be controlled by using a finer grid, but this raises the cost of the calculations or even undermines their feasibility altogether. Therefore, there is ongoing interest in the reduction of the effect per a given real-space grid. Here, we present a finite difference interpolation of electron orbitals as a means of exploiting the high resolution of the pseudopotential to reduce egg-box effects systematically. We implement the method in PARSEC, a finite difference real-space pseudopotential DFT code, and demonstrate error mitigation and improved convergence at a low additional computational cost.
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Affiliation(s)
- Deena Roller
- Weizmann Institute of Science, Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovoth 76100, Israel
| | - Andrew M Rappe
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Leeor Kronik
- Weizmann Institute of Science, Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovoth 76100, Israel
| | - Olle Hellman
- Weizmann Institute of Science, Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovoth 76100, Israel
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3
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Cohen A, Brenner TM, Klarbring J, Sharma R, Fabini DH, Korobko R, Nayak PK, Hellman O, Yaffe O. Diverging Expressions of Anharmonicity in Halide Perovskites. Adv Mater 2022; 34:e2107932. [PMID: 35076969 DOI: 10.1002/adma.202107932] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 01/19/2022] [Indexed: 06/14/2023]
Abstract
Lead-based halide perovskite crystals are shown to have strongly anharmonic structural dynamics. This behavior is important because it may be the origin of their exceptional photovoltaic properties. The double perovskite, Cs2 AgBiBr6 , has been recently studied as a lead-free alternative for optoelectronic applications. However, it does not exhibit the excellent photovoltaic activity of the lead-based halide perovskites. Therefore, to explore the correlation between the anharmonic structural dynamics and optoelectronic properties in lead-based halide perovskites, the structural dynamics of Cs2 AgBiBr6 are investigated and are compared to its lead-based analog, CsPbBr3 . Using temperature-dependent Raman measurements, it is found that both materials are indeed strongly anharmonic. Nonetheless, the expression of their anharmonic behavior is markedly different. Cs2 AgBiBr6 has well-defined normal modes throughout the measured temperature range, while CsPbBr3 exhibits a complete breakdown of the normal-mode picture above 200 K. It is suggested that the breakdown of the normal-mode picture implies that the average crystal structure may not be a proper starting point to understand the electronic properties of the crystal. In addition to our main findings, an unreported phase of Cs2 AgBiBr6 is also discovered below ≈37 K.
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Affiliation(s)
- Adi Cohen
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Thomas M Brenner
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Johan Klarbring
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
| | - Rituraj Sharma
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Douglas H Fabini
- Max Planck Institute for Solid State Research, 70569, Stuttgart, Germany
| | - Roman Korobko
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Pabitra K Nayak
- Tata Institute of Fundamental Research, Hyderabad, 500046, India
| | - Olle Hellman
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
| | - Omer Yaffe
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
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4
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Saleta Reig D, Varghese S, Farris R, Block A, Mehew JD, Hellman O, Woźniak P, Sledzinska M, El Sachat A, Chávez-Ángel E, Valenzuela SO, van Hulst NF, Ordejón P, Zanolli Z, Sotomayor Torres CM, Verstraete MJ, Tielrooij KJ. Unraveling Heat Transport and Dissipation in Suspended MoSe 2 from Bulk to Monolayer. Adv Mater 2022; 34:e2108352. [PMID: 34981868 DOI: 10.1002/adma.202108352] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 12/02/2021] [Indexed: 06/14/2023]
Abstract
Understanding heat flow in layered transition metal dichalcogenide (TMD) crystals is crucial for applications exploiting these materials. Despite significant efforts, several basic thermal transport properties of TMDs are currently not well understood, in particular how transport is affected by material thickness and the material's environment. This combined experimental-theoretical study establishes a unifying physical picture of the intrinsic lattice thermal conductivity of the representative TMD MoSe2 . Thermal conductivity measurements using Raman thermometry on a large set of clean, crystalline, suspended crystals with systematically varied thickness are combined with ab initio simulations with phonons at finite temperature. The results show that phonon dispersions and lifetimes change strongly with thickness, yet the thinnest TMD films exhibit an in-plane thermal conductivity that is only marginally smaller than that of bulk crystals. This is the result of compensating phonon contributions, in particular heat-carrying modes around ≈0.1 THz in (sub)nanometer thin films, with a surprisingly long mean free path of several micrometers. This behavior arises directly from the layered nature of the material. Furthermore, out-of-plane heat dissipation to air molecules is remarkably efficient, in particular for the thinnest crystals, increasing the apparent thermal conductivity of monolayer MoSe2 by an order of magnitude. These results are crucial for the design of (flexible) TMD-based (opto-)electronic applications.
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Affiliation(s)
- David Saleta Reig
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Sebin Varghese
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Roberta Farris
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Alexander Block
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Jake D Mehew
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Olle Hellman
- Dept of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovoth, 76100, Israel
| | - Paweł Woźniak
- ICFO-Institut de Ciéncies Fotóniques, Mediterranean Technology Park, Castelldefels, Barcelona, 08860, Spain
| | - Marianna Sledzinska
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Alexandros El Sachat
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Emigdio Chávez-Ángel
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Sergio O Valenzuela
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
- ICREA, Pg. Lluís Companys 23, Barcelona, 08010, Spain
| | - Niek F van Hulst
- ICFO-Institut de Ciéncies Fotóniques, Mediterranean Technology Park, Castelldefels, Barcelona, 08860, Spain
- ICREA, Pg. Lluís Companys 23, Barcelona, 08010, Spain
| | - Pablo Ordejón
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
| | - Zeila Zanolli
- Chemistry Department and ETSF, Debye Institute for Nanomaterials Science, Utrecht University, the Netherlands
| | - Clivia M Sotomayor Torres
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
- ICREA, Pg. Lluís Companys 23, Barcelona, 08010, Spain
| | - Matthieu J Verstraete
- Nanomat, Q-Mat, CESAM, and European Theoretical Spectroscopy Facility, Université de Liége, Liége, B-4000, Belgium
| | - Klaas-Jan Tielrooij
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), BIST and CSIC, Campus UAB, Bellaterra (Barcelona), 08193, Spain
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5
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Klarbring J, Hellman O, Abrikosov IA, Simak SI. Anharmonicity and Ultralow Thermal Conductivity in Lead-Free Halide Double Perovskites. Phys Rev Lett 2020; 125:045701. [PMID: 32794779 DOI: 10.1103/physrevlett.125.045701] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 05/22/2020] [Indexed: 06/11/2023]
Abstract
The lead-free halide double perovskite class of materials offers a promising venue for resolving issues related to toxicity of Pb and long-term stability of the lead-containing halide perovskites. We present a first-principles study of the lattice vibrations in Cs_{2}AgBiBr_{6}, the prototypical compound in this class and show that the lattice dynamics of Cs_{2}AgBiBr_{6} is highly anharmonic, largely in regards to tilting of AgBr_{6} and BiBr_{6} octahedra. Using an energy- and temperature-dependent phonon spectral function, we then show how the experimentally observed cubic-to-tetragonal phase transformation is caused by the collapse of a soft phonon branch. We finally reveal that the softness and anharmonicity of Cs_{2}AgBiBr_{6} yield an ultralow thermal conductivity, unexpected of high-symmetry cubic structures.
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Affiliation(s)
- Johan Klarbring
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
| | - Olle Hellman
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
| | - Igor A Abrikosov
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
- Materials Modeling and Development Laboratory, National University of Science and Technology (NUST) "MISIS", 119049 Moscow, Russia
| | - Sergei I Simak
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (FIM), Linköping University, SE-581 83 Linköping, Sweden
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6
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Manley ME, Hellman O, Shulumba N, May AF, Stonaha PJ, Lynn JW, Garlea VO, Alatas A, Hermann RP, Budai JD, Wang H, Sales BC, Minnich AJ. Intrinsic anharmonic localization in thermoelectric PbSe. Nat Commun 2019; 10:1928. [PMID: 31028271 PMCID: PMC6486597 DOI: 10.1038/s41467-019-09921-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 04/05/2019] [Indexed: 11/22/2022] Open
Abstract
Lead chalcogenides have exceptional thermoelectric properties and intriguing anharmonic lattice dynamics underlying their low thermal conductivities. An ideal material for thermoelectric efficiency is the phonon glass-electron crystal, which drives research on strategies to scatter or localize phonons while minimally disrupting electronic-transport. Anharmonicity can potentially do both, even in perfect crystals, and simulations suggest that PbSe is anharmonic enough to support intrinsic localized modes that halt transport. Here, we experimentally observe high-temperature localization in PbSe using neutron scattering but find that localization is not limited to isolated modes - zero group velocity develops for a significant section of the transverse optic phonon on heating above a transition in the anharmonic dynamics. Arrest of the optic phonon propagation coincides with unusual sharpening of the longitudinal acoustic mode due to a loss of phase space for scattering. Our study shows how nonlinear physics beyond conventional anharmonic perturbations can fundamentally alter vibrational transport properties.
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Affiliation(s)
- M E Manley
- Material Science and Technology Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA.
| | - O Hellman
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, 91125, USA
| | - N Shulumba
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, 91125, USA
| | - A F May
- Material Science and Technology Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA
| | - P J Stonaha
- Material Science and Technology Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA
| | - J W Lynn
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - V O Garlea
- Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA
| | - A Alatas
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 64039, USA
| | - R P Hermann
- Material Science and Technology Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA
| | - J D Budai
- Material Science and Technology Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA
| | - H Wang
- Material Science and Technology Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA
| | - B C Sales
- Material Science and Technology Division, Oak Ridge National Lab, Oak Ridge, TN, 37831, USA
| | - A J Minnich
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, 91125, USA.
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7
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Zhou JJ, Hellman O, Bernardi M. Electron-Phonon Scattering in the Presence of Soft Modes and Electron Mobility in SrTiO_{3} Perovskite from First Principles. Phys Rev Lett 2018; 121:226603. [PMID: 30547621 DOI: 10.1103/physrevlett.121.226603] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Indexed: 06/09/2023]
Abstract
Structural phase transitions and soft phonon modes pose a long-standing challenge to computing electron-phonon (e-ph) interactions in strongly anharmonic crystals. Here we develop a first-principles approach to compute e-ph scattering and charge transport in materials with anharmonic lattice dynamics. Our approach employs renormalized phonons to compute the temperature-dependent e-ph coupling for all phonon modes, including the soft modes associated with ferroelectricity and phase transitions. We show that the electron mobility in cubic SrTiO_{3} is controlled by scattering with longitudinal optical phonons at room temperature and with ferroelectric soft phonons below 200 K. Our calculations can accurately predict the temperature dependence of the electron mobility in SrTiO_{3} between 150-300 K, and reveal the microscopic origin of its roughly T^{-3} trend. Our approach enables first-principles calculations of e-ph interactions and charge transport in broad classes of crystals with phase transitions and strongly anharmonic phonons.
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Affiliation(s)
- Jin-Jian Zhou
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
| | - Olle Hellman
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
| | - Marco Bernardi
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
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8
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Bykova E, Bykov M, Černok A, Tidholm J, Simak SI, Hellman O, Belov MP, Abrikosov IA, Liermann HP, Hanfland M, Prakapenka VB, Prescher C, Dubrovinskaia N, Dubrovinsky L. Metastable silica high pressure polymorphs as structural proxies of deep Earth silicate melts. Nat Commun 2018; 9:4789. [PMID: 30442940 PMCID: PMC6237875 DOI: 10.1038/s41467-018-07265-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 10/19/2018] [Indexed: 11/24/2022] Open
Abstract
Modelling of processes involving deep Earth liquids requires information on their structures and compression mechanisms. However, knowledge of the local structures of silicates and silica (SiO2) melts at deep mantle conditions and of their densification mechanisms is still limited. Here we report the synthesis and characterization of metastable high-pressure silica phases, coesite-IV and coesite-V, using in situ single-crystal X-ray diffraction and ab initio simulations. Their crystal structures are drastically different from any previously considered models, but explain well features of pair-distribution functions of highly densified silica glass and molten basalt at high pressure. Built of four, five-, and six-coordinated silicon, coesite-IV and coesite-V contain SiO6 octahedra, which, at odds with 3rd Pauling's rule, are connected through common faces. Our results suggest that possible silicate liquids in Earth's lower mantle may have complex structures making them more compressible than previously supposed.
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Affiliation(s)
- E Bykova
- Photon Sciences, Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607, Hamburg, Germany.
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany.
| | - M Bykov
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
- Materials Modeling and Development Laboratory, National University of Science and Technology 'MISIS', Leninsky Avenue 4, 119049, Moscow, Russia
| | - A Černok
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - J Tidholm
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
| | - S I Simak
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
| | - O Hellman
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
- Department of Applied Physics and Materials Science, California Institute of Technology, 1200 East California Boulevard, Pasadena, California, 91125, USA
| | - M P Belov
- Materials Modeling and Development Laboratory, National University of Science and Technology 'MISIS', Leninsky Avenue 4, 119049, Moscow, Russia
| | - I A Abrikosov
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
| | - H-P Liermann
- Photon Sciences, Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607, Hamburg, Germany
| | - M Hanfland
- European Synchrotron Radiation Facility (ESRF), 6 Rue Jules Horowitz, 38000, Grenoble, France
| | - V B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois, 60637, USA
| | - C Prescher
- Center for Advanced Radiation Sources, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois, 60637, USA
- Institute of Geology and Mineralogy, Universität zu Köln, Zülpicher Straße 49b, 50674, Köln, Germany
| | - N Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - L Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
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9
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Abramchuk M, Lebedev OI, Hellman O, Bahrami F, Mordvinova NE, Krizan JW, Metz KR, Broido D, Tafti F. Crystal Chemistry and Phonon Heat Capacity in Quaternary Honeycomb Delafossites: Cu[Li1/3Sn2/3]O2 and Cu[Na1/3Sn2/3]O2. Inorg Chem 2018; 57:12709-12717. [DOI: 10.1021/acs.inorgchem.8b01866] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mykola Abramchuk
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Oleg I. Lebedev
- Laboratorie CRISMAT, ENSICAEN-CNRS, UMR6508, 14050 Caen, France
| | - Olle Hellman
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, United States
| | - Faranak Bahrami
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | | | - Jason W. Krizan
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Kenneth R. Metz
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - David Broido
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Fazel Tafti
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States
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10
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Kim DS, Hellman O, Herriman J, Smith HL, Lin JYY, Shulumba N, Niedziela JL, Li CW, Abernathy DL, Fultz B. Nuclear quantum effect with pure anharmonicity and the anomalous thermal expansion of silicon. Proc Natl Acad Sci U S A 2018; 115:1992-1997. [PMID: 29440490 PMCID: PMC5834665 DOI: 10.1073/pnas.1707745115] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Despite the widespread use of silicon in modern technology, its peculiar thermal expansion is not well understood. Adapting harmonic phonons to the specific volume at temperature, the quasiharmonic approximation, has become accepted for simulating the thermal expansion, but has given ambiguous interpretations for microscopic mechanisms. To test atomistic mechanisms, we performed inelastic neutron scattering experiments from 100 K to 1,500 K on a single crystal of silicon to measure the changes in phonon frequencies. Our state-of-the-art ab initio calculations, which fully account for phonon anharmonicity and nuclear quantum effects, reproduced the measured shifts of individual phonons with temperature, whereas quasiharmonic shifts were mostly of the wrong sign. Surprisingly, the accepted quasiharmonic model was found to predict the thermal expansion owing to a large cancellation of contributions from individual phonons.
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Affiliation(s)
- D S Kim
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125;
| | - O Hellman
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125
| | - J Herriman
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125
| | - H L Smith
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125
| | - J Y Y Lin
- Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
| | - N Shulumba
- Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA 91125
| | - J L Niedziela
- Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
| | - C W Li
- Department of Mechanical Engineering, University of California, Riverside, CA 92521
| | - D L Abernathy
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
| | - B Fultz
- Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125;
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11
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Shulumba N, Hellman O, Minnich AJ. Lattice Thermal Conductivity of Polyethylene Molecular Crystals from First-Principles Including Nuclear Quantum Effects. Phys Rev Lett 2017; 119:185901. [PMID: 29219537 DOI: 10.1103/physrevlett.119.185901] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Indexed: 06/07/2023]
Abstract
Molecular crystals such as polyethylene are of intense interest as flexible thermal conductors, yet their intrinsic upper limits of thermal conductivity remain unknown. Here, we report a study of the vibrational properties and lattice thermal conductivity of a polyethylene molecular crystal using an ab initio approach that rigorously incorporates nuclear quantum motion and finite temperature effects. We obtain a thermal conductivity along the chain direction of around 160 W m^{-1} K^{-1} at room temperature, providing a firm upper bound for the thermal conductivity of this molecular crystal. Furthermore, we show that the inclusion of quantum nuclear effects significantly impacts the thermal conductivity by altering the phase space for three-phonon scattering. Our computational approach paves the way for ab initio studies and computational material discovery of molecular solids free of any adjustable parameters.
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Affiliation(s)
- Nina Shulumba
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA
| | - Olle Hellman
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA
| | - Austin J Minnich
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA
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12
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Dewandre A, Hellman O, Bhattacharya S, Romero AH, Madsen GKH, Verstraete MJ. Two-Step Phase Transition in SnSe and the Origins of its High Power Factor from First Principles. Phys Rev Lett 2016; 117:276601. [PMID: 28084752 DOI: 10.1103/physrevlett.117.276601] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Indexed: 05/25/2023]
Abstract
The interest in improving the thermoelectric response of bulk materials has received a boost after it has been recognized that layered materials, in particular SnSe, show a very large thermoelectric figure of merit. This result has received great attention while it is now possible to conceive other similar materials or experimental methods to improve this value. Before we can now think of engineering this material it is important we understand the basic mechanism that explains this unusual behavior, where very low thermal conductivity and a high thermopower result from a delicate balance between the crystal and electronic structure. In this Letter, we present a complete temperature evolution of the Seebeck coefficient as the material undergoes a soft crystal transformation and its consequences on other properties within SnSe by means of first-principles calculations. Our results are able to explain the full range of considered experimental temperatures.
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Affiliation(s)
- Antoine Dewandre
- CESAM, QMAT, European Theoretical Spectroscopy Facility, Université de Liège, allée du 6 août, 19, B-4000 Liège, Belgium
| | - Olle Hellman
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | | | - Aldo H Romero
- Department of Physics, West Virginia University, 207 White Hall, 26506 West Virginia, USA
- Facultad de Ingenieria, Benemerita Universidad Autonoma de Puebla, 72570 Puebla, Pue., Mexico
| | - Georg K H Madsen
- Institute of Materials Chemistry, TU Wien, A-1060 Vienna, Austria
| | - Matthieu J Verstraete
- CESAM, QMAT, European Theoretical Spectroscopy Facility, Université de Liège, allée du 6 août, 19, B-4000 Liège, Belgium
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13
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Shulumba N, Hellman O, Raza Z, Alling B, Barrirero J, Mücklich F, Abrikosov IA, Odén M. Lattice Vibrations Change the Solid Solubility of an Alloy at High Temperatures. Phys Rev Lett 2016; 117:205502. [PMID: 27886477 DOI: 10.1103/physrevlett.117.205502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Indexed: 06/06/2023]
Abstract
We develop a method to accurately and efficiently determine the vibrational free energy as a function of temperature and volume for substitutional alloys from first principles. Taking Ti_{1-x}Al_{x}N alloy as a model system, we calculate the isostructural phase diagram by finding the global minimum of the free energy corresponding to the true equilibrium state of the system. We demonstrate that the vibrational contribution including anharmonicity and temperature dependence of the mixing enthalpy have a decisive impact on the calculated phase diagram of a Ti_{1-x}Al_{x}N alloy, lowering the maximum temperature for the miscibility gap from 6560 to 2860 K. Our local chemical composition measurements on thermally aged Ti_{0.5}Al_{0.5}N alloys agree with the calculated phase diagram.
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Affiliation(s)
- Nina Shulumba
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
- Functional Materials, Saarland University, Campus D3 3, D-66123 Saarbrücken, Germany
| | - Olle Hellman
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA
| | - Zamaan Raza
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - Björn Alling
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
- Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany
| | - Jenifer Barrirero
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
- Functional Materials, Saarland University, Campus D3 3, D-66123 Saarbrücken, Germany
| | - Frank Mücklich
- Functional Materials, Saarland University, Campus D3 3, D-66123 Saarbrücken, Germany
| | - Igor A Abrikosov
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
- Materials Modeling and Development Laboratory, NUST "MISIS," 119049 Moscow, Russia
| | - Magnus Odén
- Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
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Mosyagin I, Hellman O, Olovsson W, Simak SI, Abrikosov IA. Highly Efficient Free Energy Calculations of the Fe Equation of State Using Temperature-Dependent Effective Potential Method. J Phys Chem A 2016; 120:8761-8768. [PMID: 27700093 PMCID: PMC5199118 DOI: 10.1021/acs.jpca.6b08633] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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Free energy calculations
at finite temperature based on ab initio molecular
dynamics (AIMD) simulations have become
possible, but they are still highly computationally demanding. Besides,
achieving simultaneously high accuracy of the calculated results and
efficiency of the computational algorithm is still a challenge. In
this work we describe an efficient algorithm to determine accurate
free energies of solids in simulations using the recently proposed
temperature-dependent effective potential method (TDEP). We provide
a detailed analysis of numerical approximations employed in the TDEP algorithm. We show
that for a model system considered in this work, hcp Fe, the obtained
thermal equation of state at 2000 K is in excellent agreement with
the results of standard calculations within the quasiharmonic approximation.
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Affiliation(s)
- Igor Mosyagin
- Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-58183 Linköping, Sweden
| | - Olle Hellman
- Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-58183 Linköping, Sweden
| | - Weine Olovsson
- Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-58183 Linköping, Sweden
| | - Sergei I Simak
- Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-58183 Linköping, Sweden
| | - Igor A Abrikosov
- Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-58183 Linköping, Sweden.,Materials Modeling and Development Laboratory, NUST "MISIS" , RU-119991 Moscow, Russia
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Yang FC, Muñoz JA, Hellman O, Mauger L, Lucas MS, Tracy SJ, Stone MB, Abernathy DL, Xiao Y, Fultz B. Thermally Driven Electronic Topological Transition in FeTi. Phys Rev Lett 2016; 117:076402. [PMID: 27563978 DOI: 10.1103/physrevlett.117.076402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Indexed: 06/06/2023]
Abstract
Ab initio molecular dynamics, supported by inelastic neutron scattering and nuclear resonant inelastic x-ray scattering, showed an anomalous thermal softening of the M_{5}^{-} phonon mode in B2-ordered FeTi that could not be explained by phonon-phonon interactions or electron-phonon interactions calculated at low temperatures. A computational investigation showed that the Fermi surface undergoes a novel thermally driven electronic topological transition, in which new features of the Fermi surface arise at elevated temperatures. The thermally induced electronic topological transition causes an increased electronic screening for the atom displacements in the M_{5}^{-} phonon mode and an adiabatic electron-phonon interaction with an unusual temperature dependence.
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Affiliation(s)
- F C Yang
- Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
| | - J A Muñoz
- Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
- The Datum Institute, Beaverton, Oregon 97005, USA
| | - O Hellman
- Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
| | - L Mauger
- Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
| | - M S Lucas
- Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
- Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA
| | - S J Tracy
- Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
| | - M B Stone
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D L Abernathy
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Yuming Xiao
- HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA
| | - B Fultz
- Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA
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Li CW, Hellman O, Ma J, May AF, Cao HB, Chen X, Christianson AD, Ehlers G, Singh DJ, Sales BC, Delaire O. Phonon self-energy and origin of anomalous neutron scattering spectra in SnTe and PbTe thermoelectrics. Phys Rev Lett 2014; 112:175501. [PMID: 24836255 DOI: 10.1103/physrevlett.112.175501] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Indexed: 05/02/2023]
Abstract
The anharmonic lattice dynamics of rock-salt thermoelectric compounds SnTe and PbTe are investigated with inelastic neutron scattering (INS) and first-principles calculations. The experiments show that, surprisingly, although SnTe is closer to the ferroelectric instability, phonon spectra in PbTe exhibit a more anharmonic character. This behavior is reproduced in first-principles calculations of the temperature-dependent phonon self-energy. Our simulations reveal how the nesting of phonon dispersions induces prominent features in the self-energy, which account for the measured INS spectra and their temperature dependence. We establish that the phase space for three-phonon scattering processes, combined with the proximity to the lattice instability, is the mechanism determining the complex spectrum of the transverse-optic ferroelectric mode.
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Affiliation(s)
- C W Li
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - O Hellman
- Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-581 83, Sweden
| | - J Ma
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A F May
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H B Cao
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - X Chen
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A D Christianson
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G Ehlers
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D J Singh
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B C Sales
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - O Delaire
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Hellman O, Skorodumova NV, Simak SI. Charge redistribution mechanisms of ceria reduction. Phys Rev Lett 2012; 108:135504. [PMID: 22540715 DOI: 10.1103/physrevlett.108.135504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Revised: 01/20/2012] [Indexed: 05/31/2023]
Abstract
Charge redistribution at low oxygen vacancy concentrations in ceria have been studied in the framework of the density functional theory. We propose a model to approach the dilute limit using the results of supercell calculations. It allows one to reproduce the characteristic experimentally observed behavior of composition versus oxygen pressure dependency. We show that in the dilute limit the charge redistribution is likely to be driven by a mechanism different from the one involving electron localization on cerium atoms. We demonstrate that it can involve charge localization on light element impurities.
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Affiliation(s)
- O Hellman
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83, Linköping, Sweden
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Abstract
The reactivity of the periodic heart rate variability (HRV) to the thermal vasomotor control was studied during quiet sleep in a total of 20 neonates which were classified in 5 groups according to their maturity. Thermal stimulation on the peripheral skin was applied by an air blower at the rates of 5, 2.5 and 1.5 cycles/min. The oscillation of successive R-R intervals of the ECG was determined by a hybrid computer technique during thermal stimulations and compared to spontaneous HRV activity. The indices of the HRV and the total power of the periodic HRV remained unchanged during thermal stimulations. The response of the periodic HRV was selective at the spectral band corresponding to the frequency of stimulation. It was maximal at 5 cycles/min. The relative response was highly significant (P less than 0.001) and it increased with increasing maturity. The state of SGA (small for gestational age) seemed to decrease the vasomotor response of the HRV. The results suggested that the thermal vasomotor control was functional already in small preterm infants and it tended to increase with increasing maturity as does the autonomic cardiac control in general.
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