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2. Direct measurement of individual phonon lifetimes in the clathrate compound Ba7.81Ge40.67Au5.33

Author

Lory, Pierre-François, Pailhès, Stéphane, Giordano, Valentina M., Euchner, Holger, Nguyen, Hong Duong, Ramlau, Reiner, Borrmann, Horst, Schmidt, Marcus, Baitinger, Michael, Ikeda, Matthias, Tomeš, Petr, Mihalkovič, Marek, Allio, Céline, Johnson, Mark Robert, Schober, Helmut, Sidis, Yvan, Bourdarot, Frédéric, Regnault, Louis Pierre, Ollivier, Jacques, Paschen, Silke, Grin, Yuri, de Boissieu, Marc, Institut Laue-Langevin (ILL), ILL, Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Technical University of Vienna [Vienna] (TU WIEN), Max Planck Institute for Chemical Physics of Solids (CPfS), Max-Planck-Gesellschaft, Technische Universität Wien (TU Wien), Slovak Academy of Science [Bratislava] (SAS), Goethe-Universität Frankfurt am Main, Physics department - UFR PHITEM, Université Joseph Fourier - Grenoble 1 (UJF), Groupe 3 axes (G3A), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Groupe Diffraction Poudres (GDP), Magnétisme et Diffusion Neutronique (MDN), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria, ANR-11-BS04-0004,ODACE,Ordre et désordre dans les édifices cristallins apériodiques.(2011), ANR-13-PRGE-0004,MASCOTH,MAtériaux Siliciures COmplexes, isotropes et écodurables pour applications THermoélectriques à moyennes et hautes températures(2013), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Vienna University of Technology (TU Wien), Max-Planck-Institut für Chemische Physik fester Stoffe (CPfS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay-Institut Rayonnement Matière de Saclay (IRAMIS), Institut Nanosciences et Cryogénie (INAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Condensed Matter::Materials Science, [PHYS.PHYS]Physics [physics]/Physics [physics], [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Condensed Matter::Superconductivity, Science, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], lcsh:Q, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], lcsh:Science, Article
Abstract

Engineering lattice thermal conductivity requires to control the heat carried by atomic vibration waves, the phonons. The key parameter for quantifying it is the phonon lifetime, limiting the travelling distance, whose determination is however at the limits of instrumental capabilities. Here, we show the achievement of a direct quantitative measurement of phonon lifetimes in a single crystal of the clathrate Ba7.81Ge40.67Au5.33, renowned for its puzzling ‘glass-like’ thermal conductivity. Surprisingly, thermal transport is dominated by acoustic phonons with long lifetimes, travelling over distances of 10 to 100 nm as their wave-vector goes from 0.3 to 0.1 Å−1. Considering only low-energy acoustic phonons, and their observed lifetime, leads to a calculated thermal conductivity very close to the experimental one. Our results challenge the current picture of thermal transport in clathrates, underlining the inability of state-of-the-art simulations to reproduce the experimental data, thus representing a crucial experimental input for theoretical developments., Phonon lifetime is a fundamental parameter of thermal transport however its determination is challenging. Using inelastic neutron scattering and the neutron resonant spin-echo technique, Lory et al. determine the acoustic phonon lifetime in a single crystal of clathrate Ba7.81Ge40.67Au5.33.

Published
2017
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4. Electronic and thermal anisotropy in single- crystalline Ba8Au5.25Ge40.3 0.45

Author

Tomeš, Petr, Eguchi, Gaku, Ikeda, Matthias, Baitinger, Michael, Ngueyen, Duong, Lory, Pierre-Francois, Popčević, Petar, Smontara, Ana, Krellner, Cornelious, Grin, Yuri, and Pachen, Silke

Subjects
Electronic and thermal anisotropy, Ge-based type I
Abstract

Electronic and thermal anisotropy in single- crystalline Ba8Au5.25Ge40.3 0.45

Published
2015

6. Direct measurement of individual phonon lifetimes in the clathrate compound Ba7.81Ge40.67Au5.33.

Author

Lory, Pierre-François, Pailhès, Stéphane, Giordano, Valentina M., Euchner, Holger, Nguyen, Hong Duong, Ramlau, Reiner, Borrmann, Horst, Schmidt, Marcus, Baitinger, Michael, Ikeda, Matthias, Tomeš, Petr, Mihalkovič, Marek, Allio, Céline, Johnson, Mark Robert, Schober, Helmut, Sidis, Yvan, Bourdarot, Frédéric, Regnault, Louis Pierre, Ollivier, Jacques, and Paschen, Silke

Subjects
CLATHRATE compounds, THERMAL conductivity, ACOUSTIC phonons, DENSITY functional theory, BARIUM
Abstract

Engineering lattice thermal conductivity requires to control the heat carried by atomic vibration waves, the phonons. The key parameter for quantifying it is the phonon lifetime, limiting the travelling distance, whose determination is however at the limits of instrumental capabilities. Here, we show the achievement of a direct quantitative measurement of phonon lifetimes in a single crystal of the clathrate Ba7.81Ge40.67Au5.33, renowned for its puzzling 'glass-like' thermal conductivity. Surprisingly, thermal transport is dominated by acoustic phonons with long lifetimes, travelling over distances of 10 to 100 nm as their wave-vector goes from 0.3 to 0.1 Å-1. Considering only low-energy acoustic phonons, and their observed lifetime, leads to a calculated thermal conductivity very close to the experimental one. Our results challenge the current picture of thermal transport in clathrates, underlining the inability of state-of-the-art simulations to reproduce the experimental data, thus representing a crucial experimental input for theoretical developments. [ABSTRACT FROM AUTHOR]

Published
2017
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9. Book Review Section.

Author

McIntosh, Christopher, Von Stuckrad, Kocku, Bogdan, Henrik, Rousse-Lacordaire, Jérîme, and Lory, Pierre

Subjects
NONFICTION
Abstract

The article reviews several books on Western esotericism including "Dictionary of Gnosis and Western Esotericism," edited by Wouter J. Hanegraaff, Antoine Faivre, Roelof van den Broek and Jean-Pierre Brach, "Die Kunst des Geheimen: Esoterische Kommunikation und ästhetische Darstellung im 18. Jahrhundert," by Linda Simonis, "Alchemy and Early Modern Chemistry: Papers From Ambix," edited by Allen G. Debus, "Against the Modern World: Traditionalism and the Secret Intellectual History of the Twentieth Century," by Mark Sedgwick, and "Embracing the Dark: The Magic Order of Dragon Rouge--Its Practice in Dark Magic and Meaning Making," by Kennet Granholm.

Published
2006
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10. Reviews.

Author

Leyla Rouhi, Babak Rezvani, William F.P. Raynolds, Cyrus Schayegh, Florian Schwarz, Robert Olson, Lory, Pierre, Richard C. Foltz, Ernest Tucker, Audrey Burton, Saï d Amir Arjomand, Hashim Ahmadzadeh, Siamak Adhami, M. Jamil Hanifi, Moojan Momen, Mandana Limbert, Vanessa Martin, Ismail Poonawala, John Perry, and A. C. S. Peacock

Subjects
NONFICTION, LITERATURE
Abstract

The article reviews several books on Iranian studies including "Being Modern in Iran," by Fariba Adelkhah and translated by Jonathan Derrick, "Yeki Bud, Yeki Nabud: Essays on the Archaeology of Iran in Honor of William M. Sumner," edited by Naomi F. Miller and Kamyar Abdi, "Helvetias guter Draht zum Pfauenthron: Die Beziehungen der Schweiz zu Iran (1946—1978)," by Daniela Meier, "Studies on Central Asian History in Honour of Yuri Bregel," edited by Devin DeWeese and "The Political Development of the Kurds in Iran: Pastoral Nationalism," by Farideh Koohi–Kamali.

Published
2006
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