1
|
Kondo quasiparticle dynamics observed by resonant inelastic x-ray scattering. Nat Commun 2022; 13:6129. [PMID: 36253344 PMCID: PMC9576770 DOI: 10.1038/s41467-022-33468-6] [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] [Received: 01/10/2022] [Accepted: 09/15/2022] [Indexed: 11/30/2022] Open
Abstract
Effective models focused on pertinent low-energy degrees of freedom have substantially contributed to our qualitative understanding of quantum materials. An iconic example, the Kondo model, was key to demonstrating that the rich phase diagrams of correlated metals originate from the interplay of localized and itinerant electrons. Modern electronic structure calculations suggest that to achieve quantitative material-specific models, accurate consideration of the crystal field and spin-orbit interactions is imperative. This poses the question of how local high-energy degrees of freedom become incorporated into a collective electronic state. Here, we use resonant inelastic x-ray scattering (RIXS) on CePd3 to clarify the fate of all relevant energy scales. We find that even spin-orbit excited states acquire pronounced momentum-dependence at low temperature—the telltale sign of hybridization with the underlying metallic state. Our results demonstrate how localized electronic degrees of freedom endow correlated metals with new properties, which is critical for a microscopic understanding of superconducting, electronic nematic, and topological states. The fate of high-energy degrees of freedom, such as spin-orbit interactions, in the coherent state of Kondo lattice materials remains unclear. Here, the authors use resonant inelastic x-ray scattering in CePd3 to show how Kondo-quasiparticle excitations are renormalized and develop a pronounced momentum dependence, while maintaining a largely unchanged spin-orbit gap.
Collapse
|
2
|
Mazzone DG, Dzero M, Abeykoon AM, Yamaoka H, Ishii H, Hiraoka N, Rueff JP, Ablett JM, Imura K, Suzuki HS, Hancock JN, Jarrige I. Kondo-Induced Giant Isotropic Negative Thermal Expansion. PHYSICAL REVIEW LETTERS 2020; 124:125701. [PMID: 32281848 DOI: 10.1103/physrevlett.124.125701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 02/14/2020] [Indexed: 06/11/2023]
Abstract
Negative thermal expansion is an unusual phenomenon appearing in only a handful of materials, but pursuit and mastery of the phenomenon holds great promise for applications across disciplines and industries. Here we report use of x-ray spectroscopy and diffraction to investigate the 4f-electronic properties in Y-doped SmS and employ the Kondo volume collapse model to interpret the results. Our measurements reveal an unparalleled decrease of the bulk Sm valence by over 20% at low temperatures in the mixed-valent golden phase, which we show is caused by a strong coupling between an emergent Kondo lattice state and a large isotropic volume change. The amplitude and temperature range of the negative thermal expansion appear strongly dependent on the Y concentration and the associated chemical disorder, providing control over the observed effect. This finding opens avenues for the design of Kondo lattice materials with tunable, giant, and isotropic negative thermal expansion.
Collapse
Affiliation(s)
- D G Mazzone
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - M Dzero
- Department of Physics, Kent State University, Kent, Ohio 44242, USA
| | - Am M Abeykoon
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - H Yamaoka
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - H Ishii
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - N Hiraoka
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - J-P Rueff
- Synchrotron SOLEIL, L'Orme des Merisiers, BP 48 Saint-Aubin, 91192 Gif-sur-Yvette, France
- Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, 75005 Paris, France
| | - J M Ablett
- Synchrotron SOLEIL, L'Orme des Merisiers, BP 48 Saint-Aubin, 91192 Gif-sur-Yvette, France
| | - K Imura
- Department of Physics, Nagoya University, Nagoya 464-8602, Japan
| | - H S Suzuki
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science (NIMS), Sengen, Tsukuba 305-0047, Japan
- The Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa 277-8581, Japan
| | - J N Hancock
- Department of Physics and Institute for Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA
| | - I Jarrige
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
| |
Collapse
|
3
|
Savchenkov PS, Alekseev PA, Podlesnyak A, Kolesnikov AI, Nemkovski KS. Intermediate-valence state of the Sm and Eu in SmB 6 and EuCu 2Si 2: neutron spectroscopy data and analysis. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:055801. [PMID: 29324435 DOI: 10.1088/1361-648x/aaa1aa] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Magnetic neutron scattering data for Sm (SmB6, Sm(Y)S) and Eu (EuCu2Si2-x Ge x ) intermediate-valence compounds have been analysed in terms of a generalized model of the intermediate-radius exciton. Special attention is paid to the correlation between the average ion's valence and parameters of the low-energy excitation in the neutron spectra, such as the resonance mode, including its magnetic form factor. Along with specific features of the formation of the intermediate-valence state for Sm and Eu ions, common physical mechanisms have been revealed for systems based on these elements from the middle of the rare-earth series. A consistent description of the existing experimental data has been obtained by using the concept of a loosely bound hole for the Eu f-electron shell in the intermediate-valence state, in analogy with the previously established loosely bound electron model for the Sm ion.
Collapse
Affiliation(s)
- P S Savchenkov
- National Research Nuclear University MEPhI, 115409, Moscow, Russia. National Research Centre Kurchatov Institute, 123182, Moscow, Russia
| | | | | | | | | |
Collapse
|
4
|
Goremychkin EA, Park H, Osborn R, Rosenkranz S, Castellan JP, Fanelli VR, Christianson AD, Stone MB, Bauer ED, McClellan KJ, Byler DD, Lawrence JM. Coherent band excitations in CePd 3: A comparison of neutron scattering and ab initio theory. Science 2018; 359:186-191. [PMID: 29326267 DOI: 10.1126/science.aan0593] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 12/01/2017] [Indexed: 11/02/2022]
Abstract
In common with many strongly correlated electron systems, intermediate valence compounds are believed to display a crossover from a high-temperature regime of incoherently fluctuating local moments to a low-temperature regime of coherent hybridized bands. We show that inelastic neutron scattering measurements of the dynamic magnetic susceptibility of CePd3 provides a benchmark for ab initio calculations based on dynamical mean field theory. The magnetic response is strongly momentum dependent thanks to the formation of coherent f-electron bands at low temperature, with an amplitude that is strongly enhanced by local particle-hole interactions. The agreement between experiment and theory shows that we have a robust first-principles understanding of the temperature dependence of f-electron coherence.
Collapse
Affiliation(s)
- Eugene A Goremychkin
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia
| | - Hyowon Park
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4845, USA.,Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Raymond Osborn
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4845, USA.
| | - Stephan Rosenkranz
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4845, USA
| | - John-Paul Castellan
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439-4845, USA.,Institute for Solid State Physics, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany
| | - Victor R Fanelli
- Instrument and Source Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Andrew D Christianson
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Matthew B Stone
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Eric D Bauer
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | | | - Darrin D Byler
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Jon M Lawrence
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA.,Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
| |
Collapse
|
5
|
Fobes DM, Bauer ED, Thompson JD, Sazonov A, Hutanu V, Zhang S, Ronning F, Janoschek M. Low temperature magnetic structure of CeRhIn 5 by neutron diffraction on absorption-optimized samples. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:17LT01. [PMID: 28349895 DOI: 10.1088/1361-648x/aa6696] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Two aspects of the ambient pressure magnetic structure of heavy fermion material CeRhIn5 have remained under some debate since its discovery: whether the structure is indeed an incommensurate helix or a spin density wave, and what is the precise magnitude of the ordered magnetic moment. By using a single crystal sample optimized for hot neutrons to minimize neutron absorption by Rh and In, here we report an ordered moment of [Formula: see text]. In addition, by using spherical neutron polarimetry measurements on a similar single crystal sample, we have confirmed the helical nature of the magnetic structure, and identified a single chiral domain.
Collapse
Affiliation(s)
- D M Fobes
- MPA-CMMS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States of America
| | | | | | | | | | | | | | | |
Collapse
|
6
|
Riseborough PS, Lawrence JM. Mixed valent metals. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:084501. [PMID: 27376888 DOI: 10.1088/0034-4885/79/8/084501] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We review the theory of mixed-valent metals and make comparison with experiments. A single-impurity description of the mixed-valent state is discussed alongside the description of the nearly-integer valent or Kondo limit. The degeneracy N of the f-shell plays an important role in the description of the low-temperature Fermi-liquid state. In particular, for large N, there is a rapid cross-over between the mixed-valent and the Kondo limit when the number of f electrons is changed. We discuss the limitations on the application of the single-impurity description to concentrated compounds such as those caused by the saturation of the Kondo effect and those due to the presence of magnetic interactions between the impurities. This discussion is followed by a description of a periodic lattice of mixed-valent ions, including the role of the degeneracy N. The article concludes with a comparison of theory and experiment. Topics covered include the single-impurity Anderson model, Luttinger's theorem, the Friedel sum rule, the Schrieffer-Wolff transformation, the single-impurity Kondo model, Kondo screening, the Wilson ratio, local Fermi-liquids, Fermi-liquid sum rules, the Noziéres exhaustion principle, Doniach's diagram, the Anderson lattice model, the Slave-Boson method, etc.
Collapse
|
7
|
Pham TA, Altman AB, Stieber SCE, Booth CH, Kozimor SA, Lukens WW, Olive DT, Tyliszczak T, Wang J, Minasian SG, Raymond KN. A Macrocyclic Chelator That Selectively Binds Ln4+ over Ln3+ by a Factor of 1029. Inorg Chem 2016; 55:9989-10002. [DOI: 10.1021/acs.inorgchem.6b00684] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tiffany A. Pham
- University of California, Berkeley, California 94720, United States
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Alison B. Altman
- University of California, Berkeley, California 94720, United States
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - S. Chantal E. Stieber
- Los Alamos National Laboratory (LANL), Los
Alamos, New Mexico 87545, United States
- California State Polytechnic University, Pomona, California 91768, United States
| | - Corwin H. Booth
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Stosh A. Kozimor
- Los Alamos National Laboratory (LANL), Los
Alamos, New Mexico 87545, United States
| | - Wayne W. Lukens
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Daniel T. Olive
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Tolek Tyliszczak
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Jian Wang
- Canadian Light Source (CLS), Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Stefan G. Minasian
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| | - Kenneth N. Raymond
- University of California, Berkeley, California 94720, United States
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, United States
| |
Collapse
|
8
|
Gumeniuk R, Schnelle W, Ahmida MA, Abd-Elmeguid MM, Kvashnina KO, Tsirlin AA, Leithe-Jasper A, Geibel C. Valence fluctuations of europium in the boride Eu4Pd(29+x)B8. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:115601. [PMID: 26895077 DOI: 10.1088/0953-8984/28/11/115601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We synthesized a high-quality sample of the boride Eu4Pd(29+x)B8 (x = 0.76) and studied its structural and physical properties. Its tetragonal structure was solved by direct methods and confirmed to belong to the Eu4Pd29B8 type. All studied physical properties indicate a valence fluctuating Eu state, with a valence decreasing continuously from about 2.9 at 5 K to 2.7 at 300 K. Maxima in the T dependence of the susceptibility and thermopower at around 135 K and 120 K, respectively, indicate a valence fluctuation energy scale on the order of 300 K. Analysis of the magnetic susceptibility evidences some inconsistencies when using the ionic interconfigurational fluctuation (ICF) model, thus suggesting a stronger relevance of hybridization between 4f and valence electrons compared to standard valence-fluctuating Eu systems.
Collapse
Affiliation(s)
- Roman Gumeniuk
- Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, Germany. Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Janoschek M, Das P, Chakrabarti B, Abernathy DL, Lumsden MD, Lawrence JM, Thompson JD, Lander GH, Mitchell JN, Richmond S, Ramos M, Trouw F, Zhu JX, Haule K, Kotliar G, Bauer ED. The valence-fluctuating ground state of plutonium. SCIENCE ADVANCES 2015; 1:e1500188. [PMID: 26601219 PMCID: PMC4646783 DOI: 10.1126/sciadv.1500188] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 05/12/2015] [Indexed: 06/01/2023]
Abstract
A central issue in material science is to obtain understanding of the electronic correlations that control complex materials. Such electronic correlations frequently arise because of the competition of localized and itinerant electronic degrees of freedom. Although the respective limits of well-localized or entirely itinerant ground states are well understood, the intermediate regime that controls the functional properties of complex materials continues to challenge theoretical understanding. We have used neutron spectroscopy to investigate plutonium, which is a prototypical material at the brink between bonding and nonbonding configurations. Our study reveals that the ground state of plutonium is governed by valence fluctuations, that is, a quantum mechanical superposition of localized and itinerant electronic configurations as recently predicted by dynamical mean field theory. Our results not only resolve the long-standing controversy between experiment and theory on plutonium's magnetism but also suggest an improved understanding of the effects of such electronic dichotomy in complex materials.
Collapse
Affiliation(s)
- Marc Janoschek
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Pinaki Das
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Bismayan Chakrabarti
- Department of Physics and Astronomy and Center for Condensed Matter Theory, Rutgers University, Piscataway, NJ 08854–8019, USA
| | - Douglas L. Abernathy
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6475, USA
| | - Mark D. Lumsden
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6475, USA
| | | | | | - Gerard H. Lander
- European Commission, Joint Research Centre, Institute for Transuranium Elements, Postfach 2340, D-76125 Karlsruhe, Germany
| | | | - Scott Richmond
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Mike Ramos
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Frans Trouw
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Jian-Xin Zhu
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Kristjan Haule
- Department of Physics and Astronomy and Center for Condensed Matter Theory, Rutgers University, Piscataway, NJ 08854–8019, USA
| | - Gabriel Kotliar
- Department of Physics and Astronomy and Center for Condensed Matter Theory, Rutgers University, Piscataway, NJ 08854–8019, USA
| | - Eric D. Bauer
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| |
Collapse
|