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Engel S, Gießelmann ECJ, Reimann MK, Pöttgen R, Janka O. On the Ytterbium Valence and the Physical Properties in Selected Intermetallic Phases. ACS ORGANIC & INORGANIC AU 2024; 4:188-222. [PMID: 38585514 PMCID: PMC10996054 DOI: 10.1021/acsorginorgau.3c00054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 04/09/2024]
Abstract
The present review summarizes important aspects of the crystal chemistry of ytterbium-based intermetallic compounds along with a selection of their outstanding physical properties. These originate in many cases from the ytterbium valence. Different valence states are possible here, divalent (4f14), intermediate-valent, or trivalent (4f13) ytterbium, resulting in simple diamagnetic, Pauli or Curie-Weiss paramagnetic, or valence fluctuating behavior. Especially, some of the Yb3+ intermetallics have gained deep interest due to their Kondo or heavy Fermion ground states. We have summarized their property investigations using magnetic and transport measurements, specific heat data, NMR, ESR, and Mössbauer spectroscopy, elastic and inelastic neutron scattering, and XAS data as well as detailed thermoelectric measurements.
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Affiliation(s)
- Stefan Engel
- Anorganische
Festkörperchemie Universität
des Saarlandes, Campus C4.1 66123 Saarbrücken, Germany
| | - Elias C. J. Gießelmann
- Anorganische
Festkörperchemie Universität
des Saarlandes, Campus C4.1 66123 Saarbrücken, Germany
| | - Maximilian K. Reimann
- Institut
für Anorganische und Analytische Chemie, Universität Münster Corrensstrasse 30 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut
für Anorganische und Analytische Chemie, Universität Münster Corrensstrasse 30 48149 Münster, Germany
| | - Oliver Janka
- Anorganische
Festkörperchemie Universität
des Saarlandes, Campus C4.1 66123 Saarbrücken, Germany
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2
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Kobayashi H, Sakaguchi Y, Kitagawa H, Oura M, Ikeda S, Kuga K, Suzuki S, Nakatsuji S, Masuda R, Kobayashi Y, Seto M, Yoda Y, Tamasaku K, Komijani Y, Chandra P, Coleman P. Observation of a critical charge mode in a strange metal. Science 2023. [PMID: 36862771 DOI: 10.1126/science.abc4787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
Understanding the strange metallic behavior that develops at the brink of localization in quantum materials requires probing the underlying electronic charge dynamics. Using synchrotron radiation-based Mössbauer spectroscopy, we studied the charge fluctuations of the strange metal phase of β-YbAlB4 as a function of temperature and pressure. We found that the usual single absorption peak in the Fermi-liquid regime splits into two peaks upon entering the critical regime. We interpret this spectrum as a single nuclear transition, modulated by nearby electronic valence fluctuations whose long time scales are further enhanced by the formation of charged polarons. These critical charge fluctuations may prove to be a distinct signature of strange metals.
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Affiliation(s)
- Hisao Kobayashi
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Yui Sakaguchi
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan
| | - Hayato Kitagawa
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Momoko Oura
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Shugo Ikeda
- Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Hyogo 678-1297, Japan.,RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Kentaro Kuga
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Shintaro Suzuki
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Satoru Nakatsuji
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.,Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,Trans-scale Quantum Science Institute, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.,Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Ryo Masuda
- RIKEN SPring-8 Center, Hyogo 679-5148, Japan.,Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan.,Graduate School of Science and Technology, Hirosaki University, Aomori 036-8561 Japan
| | - Yasuhiro Kobayashi
- RIKEN SPring-8 Center, Hyogo 679-5148, Japan.,Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan
| | - Makoto Seto
- RIKEN SPring-8 Center, Hyogo 679-5148, Japan.,Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan
| | | | - Yashar Komijani
- Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011, USA.,Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
| | - Premala Chandra
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
| | - Piers Coleman
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.,Hubbard Theory Consortium, Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
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3
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Strongly Correlated Quantum Spin Liquids versus Heavy Fermion Metals: A Review. MATERIALS 2022; 15:ma15113901. [PMID: 35683199 PMCID: PMC9182384 DOI: 10.3390/ma15113901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Revised: 05/15/2022] [Accepted: 05/25/2022] [Indexed: 12/04/2022]
Abstract
This review considers the topological fermion condensation quantum phase transition (FCQPT) that explains the complex behavior of strongly correlated Fermi systems, such as frustrated insulators with quantum spin liquid and heavy fermion metals. The review contrasts theoretical consideration with recent experimental data collected on both heavy fermion metals (HF) and frustrated insulators. Such a method allows to understand experimental data. We also consider experimental data collected on quantum spin liquid in Lu3Cu2Sb3O14 and quasi-one dimensional (1D) quantum spin liquid in both YbAlO3 and Cu(C4H4N2)(NO3)2 with the aim to establish a sound theoretical explanation for the observed scaling laws, Landau Fermi liquid (LFL) and non-Fermi-liquid (NFL) behavior exhibited by these frustrated insulators. The recent experimental data on the heavy-fermion metal α−YbAl1−xFexB4, with x=0.014, and on its sister compounds β−YbAlB4 and YbCo2Ge4, carried out under the application of magnetic field as a control parameter are analyzed. We show that the thermodynamic and transport properties as well as the empirical scaling laws follow from the fermion condensation theory. We explain how both the similarity and the difference in the thermodynamic and transport properties of α−YbAl1−xFexB4 and in its sister compounds β−YbAlB4 and YbCo2Ge4 emerge, as well as establish connection of these (HF) metals with insulators Lu3Cu2Sb3O14, Cu(C4H4N2)(NO3)2 and YbAlO3. We demonstrate that the universal LFL and NFL behavior emerge because the HF compounds and the frustrated insulators are located near the topological FCQPT or are driven by the application of magnetic fields.
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4
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Grbić MS, O'Farrell ECT, Matsumoto Y, Kuga K, Brando M, Küchler R, Nevidomskyy AH, Yoshida M, Sakakibara T, Kono Y, Shimura Y, Sutherland ML, Takigawa M, Nakatsuji S. Anisotropy-driven quantum criticality in an intermediate valence system. Nat Commun 2022; 13:2141. [PMID: 35440657 PMCID: PMC9019086 DOI: 10.1038/s41467-022-29757-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 03/29/2022] [Indexed: 11/08/2022] Open
Abstract
Intermetallic compounds containing f-electron elements have been prototypical materials for investigating strong electron correlations and quantum criticality (QC). Their heavy fermion ground state evoked by the magnetic f-electrons is susceptible to the onset of quantum phases, such as magnetism or superconductivity, due to the enhanced effective mass (m*) and a corresponding decrease of the Fermi temperature. However, the presence of f-electron valence fluctuations to a non-magnetic state is regarded an anathema to QC, as it usually generates a paramagnetic Fermi-liquid state with quasiparticles of moderate m*. Such systems are typically isotropic, with a characteristic energy scale T0 of the order of hundreds of kelvins that require large magnetic fields or pressures to promote a valence or magnetic instability. Here we show the discovery of a quantum critical behaviour and a Lifshitz transition under low magnetic field in an intermediate valence compound α-YbAlB4. The QC origin is attributed to the anisotropic hybridization between the conduction and localized f-electrons. These findings suggest a new route to bypass the large valence energy scale in developing the QC.
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Affiliation(s)
- Mihael S Grbić
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan.
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, Zagreb, HR 10000, Croatia.
| | - Eoin C T O'Farrell
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan.
| | - Yosuke Matsumoto
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan
| | - Kentaro Kuga
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan
| | - Manuel Brando
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187, Dresden, Germany
| | - Robert Küchler
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187, Dresden, Germany
| | | | - Makoto Yoshida
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan
| | - Toshiro Sakakibara
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan
| | - Yohei Kono
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan
| | - Yasuyuki Shimura
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan
| | - Michael L Sutherland
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Masashi Takigawa
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan.
| | - Satoru Nakatsuji
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, 277-8581, Japan.
- Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan.
- CREST, Japan Science and Technology Agency (JST), Honcho Kawaguchi, Saitama, 332-0012, Japan.
- Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, 21218, USA.
- Trans-scale Quantum Science Institute, University of Tokyo, Tokyo, 113-0033, Japan.
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5
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Squillante L, F Mello I, O Gomes G, Seridonio AC, Lagos-Monaco RE, Stanley HE, de Souza M. Unveiling the Physics of the Mutual Interactions in Paramagnets. Sci Rep 2020; 10:7981. [PMID: 32409745 PMCID: PMC7224220 DOI: 10.1038/s41598-020-64632-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 04/20/2020] [Indexed: 11/19/2022] Open
Abstract
In real paramagnets, there is always a subtle many-body contribution to the system's energy, which can be regarded as a small effective local magnetic field (Bloc). Usually, it is neglected, since it is very small when compared with thermal fluctuations and/or external magnetic fields (B). Nevertheless, as both the temperature (T) → 0 K and B → 0 T, such many-body contributions become ubiquitous. Here, employing the magnetic Grüneisen parameter (Γmag) and entropy arguments, we report on the pivotal role played by the mutual interactions in the regime of ultra-low-T and vanishing B. Our key results are: i) absence of a genuine zero-field quantum phase transition due to the presence of Bloc; ii) connection between the canonical definition of temperature and Γmag; and iii) possibility of performing adiabatic magnetization by only manipulating the mutual interactions. Our findings unveil unprecedented aspects emerging from the mutual interactions.
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Affiliation(s)
- Lucas Squillante
- São Paulo State University (Unesp), IGCE - Physics Department, Rio Claro, SP, Brazil
| | - Isys F Mello
- São Paulo State University (Unesp), IGCE - Physics Department, Rio Claro, SP, Brazil
| | - Gabriel O Gomes
- Department of Astronomy, University of São Paulo, São Paulo, 05508-090, SP, Brazil
| | - A C Seridonio
- São Paulo State University (Unesp), Department of Physics and Chemistry, Ilha Solteira, SP, Brazil
| | - R E Lagos-Monaco
- São Paulo State University (Unesp), IGCE - Physics Department, Rio Claro, SP, Brazil
| | | | - Mariano de Souza
- São Paulo State University (Unesp), IGCE - Physics Department, Rio Claro, SP, Brazil.
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6
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Kuga K, Kanai Y, Fujiwara H, Yamagami K, Hamamoto S, Aoyama Y, Sekiyama A, Higashiya A, Kadono T, Imada S, Yamasaki A, Tanaka A, Tamasaku K, Yabashi M, Ishikawa T, Nakatsuji S, Kiss T. Effect of Anisotropic Hybridization in YbAlB_{4} Probed by Linear Dichroism in Core-Level Hard X-Ray Photoemission Spectroscopy. PHYSICAL REVIEW LETTERS 2019; 123:036404. [PMID: 31386467 DOI: 10.1103/physrevlett.123.036404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Indexed: 06/10/2023]
Abstract
We have probed the crystalline electric-field ground states of pure |J=7/2,J_{z}=±5/2⟩ as well as the anisotropic c-f hybridization in both valence fluctuating systems α- and β-YbAlB_{4} by linear polarization dependence of angle-resolved core level photoemission spectroscopy. Interestingly, the small but distinct difference between α- and β-YbAlB_{4} was found in the polar angle dependence of linear dichroism, indicating the difference in the anisotropy of c-f hybridization, which may be a key to understanding a heavy Fermi liquid state in α-YbAlB_{4} and a quantum critical state in β-YbAlB_{4}.
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Affiliation(s)
- Kentaro Kuga
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - Yuina Kanai
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Hidenori Fujiwara
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Kohei Yamagami
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Satoru Hamamoto
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Yuichi Aoyama
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Akira Sekiyama
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Atsushi Higashiya
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Faculty of Science and Engineering, Setsunan University, Neyagawa, Osaka 572-8508, Japan
| | - Toshiharu Kadono
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Shin Imada
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Atsushi Yamasaki
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Faculty of Science and Engineering, Konan University, Kobe, Hyogo 658-8501, Japan
| | - Arata Tanaka
- Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
| | | | | | | | - Satoru Nakatsuji
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
| | - Takayuki Kiss
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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7
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Kuga K, Matsumoto Y, Okawa M, Suzuki S, Tomita T, Sone K, Shimura Y, Sakakibara T, Nishio-Hamane D, Karaki Y, Takata Y, Matsunami M, Eguchi R, Taguchi M, Chainani A, Shin S, Tamasaku K, Nishino Y, Yabashi M, Ishikawa T, Nakatsuji S. Quantum valence criticality in a correlated metal. SCIENCE ADVANCES 2018; 4:eaao3547. [PMID: 29492456 PMCID: PMC5825215 DOI: 10.1126/sciadv.aao3547] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 01/19/2018] [Indexed: 06/08/2023]
Abstract
A valence critical end point existing near the absolute zero provides a unique case for the study of a quantum version of the strong density fluctuation at the Widom line in the supercritical fluids. Although singular charge and orbital dynamics are suggested theoretically to alter the electronic structure significantly, breaking down the standard quasi-particle picture, this has never been confirmed experimentally to date. We provide the first empirical evidence that the proximity to quantum valence criticality leads to a clear breakdown of Fermi liquid behavior. Our detailed study of the mixed valence compound α-YbAlB4 reveals that a small chemical substitution induces a sharp valence crossover, accompanied by a pronounced non-Fermi liquid behavior characterized by a divergent effective mass and unusual T/B scaling in the magnetization.
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Affiliation(s)
- Kentaro Kuga
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
- RIKEN SPring-8 Center, Sayo-gun, Hyogo 679-5148, Japan
| | - Yosuke Matsumoto
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Mario Okawa
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Shintaro Suzuki
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Takahiro Tomita
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Keita Sone
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Yasuyuki Shimura
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Toshiro Sakakibara
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | | | - Yoshitomo Karaki
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
- Faculty of Education, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
| | | | - Masaharu Matsunami
- Ultraviolet Synchrotron Orbital Radiation Facility, Institute for Molecular Science and The Graduate University for Advanced Studies, Okazaki 444-8585, Japan
| | - Ritsuko Eguchi
- Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
| | | | - Ashish Chainani
- RIKEN SPring-8 Center, Sayo-gun, Hyogo 679-5148, Japan
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Shik Shin
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
- RIKEN SPring-8 Center, Sayo-gun, Hyogo 679-5148, Japan
| | | | - Yoshinori Nishino
- RIKEN SPring-8 Center, Sayo-gun, Hyogo 679-5148, Japan
- Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japan
| | | | | | - Satoru Nakatsuji
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
- Core Research for Evolutionary Science and Technology, Japan Science and Technology Agency, Chiyoda, Tokyo 102-0076, Japan
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8
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Stockert U, Sun P, Oeschler N, Steglich F, Takabatake T, Coleman P, Paschen S. Giant Isotropic Nernst Effect in an Anisotropic Kondo Semimetal. PHYSICAL REVIEW LETTERS 2016; 117:216401. [PMID: 27911533 DOI: 10.1103/physrevlett.117.216401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Indexed: 06/06/2023]
Abstract
The "failed Kondo insulator" CeNiSn has long been suspected to be a nodal metal, with a node in the hybridization matrix elements. Here we carry out a series of Nernst effect experiments to delineate whether the severely anisotropic magnetotransport coefficients do indeed derive from a nodal metal or can simply be explained by a highly anisotropic Fermi surface. Our experiments reveal that despite an almost twentyfold anisotropy in the Hall conductivity, the large Nernst signal is isotropic. Taken in conjunction with the magnetotransport anisotropy, these results provide strong support for an isotropic Fermi surface with a large anisotropy in quasiparticle mass derived from a nodal hybridization.
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Affiliation(s)
- Ulrike Stockert
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Peijie Sun
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Niels Oeschler
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Frank Steglich
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Toshiro Takabatake
- Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
| | - Piers Coleman
- Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08855, USA
- Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
| | - Silke Paschen
- Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040 Vienna, Austria
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9
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Ryu H, Abeykoon M, Bozin E, Matsumoto Y, Nakatsuji S, Petrovic C. Multiband electronic transport in α-Yb1-x Sr x AlB4 [x = 0, 0.19(3)] single crystals. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:425602. [PMID: 27541840 DOI: 10.1088/0953-8984/28/42/425602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on the evidence for the multiband electronic transport in α-YbAlB4 and α-Yb0.81(2)Sr0.19(3)AlB4. Multiband transport reveals itself below 10 K in both compounds via Hall effect measurements, whereas anisotropic magnetic ground state sets in below 3 K in α-Yb0.81(2)Sr0.19(3)AlB4. Our results show that Sr(2+) substitution enhances conductivity, but does not change the quasiparticle mass of bands induced by heavy fermion hybridization.
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Affiliation(s)
- Hyejin Ryu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA. Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA
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10
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Tomita T, Kuga K, Uwatoko Y, Coleman P, Nakatsuji S. Strange metal without magnetic criticality. Science 2015; 349:506-9. [DOI: 10.1126/science.1262054] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 07/06/2015] [Indexed: 11/02/2022]
Affiliation(s)
- Takahiro Tomita
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
- College of Humanities and Sciences, Nihon University, Setagaya 156-8550, Japan
| | - Kentaro Kuga
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Yoshiya Uwatoko
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Piers Coleman
- Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, N.J. 08854, USA
- Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
| | - Satoru Nakatsuji
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
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11
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Holanda LM, Lesseux GG, Magnavita ET, Ribeiro RA, Nakatsuji S, Kuga K, Fisk Z, Oseroff SB, Urbano RR, Rettori C, Pagliuso PG. Conduction electron spin resonance in the α-Yb1-xFexAlB4 (0 ⩽ x ⩽ 0.50) and α-LuAlB4 compounds. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:255601. [PMID: 26045483 DOI: 10.1088/0953-8984/27/25/255601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
β-YbAlB4 has become one of the most studied heavy fermion systems since its discovery due to its remarkable physical properties. This system is the first reported Yb-based heavy-fermion superconductor (HFS) for which the low-T superconducting state emerges from a non-fermi-liquid (NFL) normal state associated with quantum criticality Nakatsuji et al 2008 Nature 4 603. Additionally, it presents a striking and unprecedented electron spin resonance (ESR) signal which behaves as a conduction electron spin resonance (CESR) at high temperatures and acquires features of the Yb(3+) local moment ESR at low temperatures. The latter, also named Kondo quasiparticles spin resonance (KQSR), has been defined as a 4f-ce strongly coupled ESR mode that behaves as a local probe of the Kondo quasiparticles in a quantum critical regime, Holanda et al 2011 Phys. Rev. Lett. 107 026402. Interestingly, β-YbAlB4 possesses a previously known structural variant, namely the α-YbAlB4, phase which is a paramagnetic Fermi liquid (FL) at low temperatures Macaluso et al 2007 Chem. Mater. 19 1918. However, it has been recently suggested that the α-YbAlB4 phase may be tuned to NFL behavior and/or magnetic ordering as the compound is doped with Fe. Here we report ESR studies on the α-Yb1-xFexAlB4 (0 ⩽ x ⩽ 0.50) series as well as on the reference compound α-LuAlB4. For all measured samples, the observed ESR signal behaves as a CESR in the entire temperature range (10 K ≲ T ≲ 300 K) in clear contrast with what has been observed for β-YbAlB4. This striking result indicates that the proximity to a quantum critical point is crucial to the occurrence of a KQSR signal.
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Affiliation(s)
- L M Holanda
- Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas, SP 13083-859, Brazil. Universidade Federal Rural do Semi-Árido (UFERSA), Pau dos Ferros, RN 59900-000, Brazil
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Ramires A, Coleman P. Theory of the electron spin resonance in the heavy fermion metal β-YbAlB4. PHYSICAL REVIEW LETTERS 2014; 112:116405. [PMID: 24702395 DOI: 10.1103/physrevlett.112.116405] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Indexed: 06/03/2023]
Abstract
The heavy fermion metal β-YbAlB4 exhibits a bulk room temperature conduction electron spin resonance (ESR) signal which evolves into an Ising-anisotropic f-electron signal exhibiting hyperfine features at low temperatures. We develop a theory for this phenomenon based on the development of resonant scattering off a periodic array of Kondo centers. We show that the hyperfine structure arises from the scattering off the Yb atoms with nonzero nuclear spin, while the constancy of the ESR intensity is a consequence of the presence of crystal electric field excitations of the order of the hybridization strength.
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Affiliation(s)
- Aline Ramires
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Piers Coleman
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
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Hackl A, Vojta M. Hackl and Vojta reply. PHYSICAL REVIEW LETTERS 2013; 111:139702. [PMID: 24116823 DOI: 10.1103/physrevlett.111.139702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Indexed: 06/02/2023]
Affiliation(s)
- Andreas Hackl
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
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Tokiwa Y, Garst M, Gegenwart P, Bud'ko SL, Canfield PC. Quantum bicriticality in the heavy-fermion metamagnet YbAgGe. PHYSICAL REVIEW LETTERS 2013; 111:116401. [PMID: 24074108 DOI: 10.1103/physrevlett.111.116401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Indexed: 06/02/2023]
Abstract
Bicritical points, at which two distinct symmetry-broken phases become simultaneously unstable, are typical for spin-flop metamagnetism. Interestingly, the heavy-fermion compound YbAgGe also possesses such a bicritical point (BCP) with a low temperature T(BCP)≈0.3 K at a magnetic field of μH(BCP)≈4.5 T. In its vicinity, YbAgGe exhibits anomalous behavior that we attribute to the influence of a quantum bicritical point that is close in parameter space yet can be reached by tuning T(BCP) further to zero. Using high-resolution measurements of the magnetocaloric effect, we demonstrate that the magnetic Grüneisen parameter ΓH indeed both changes sign and diverges as required for quantum criticality. Moreover, ΓH displays a characteristic scaling behavior but only on the low-field side H≲H(BCP), indicating a pronounced asymmetry with respect to the critical field. We speculate that the small value of T(BCP) is related to the geometric frustration of the Kondo lattice of YbAgGe.
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Affiliation(s)
- Y Tokiwa
- I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany
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Holanda LM, Mendonça-Ferreira L, Ribeiro RA, Osorio-Guillén JM, Dalpian GM, Kuga K, Nakatsuji S, Fisk Z, Urbano RR, Pagliuso PG, Rettori C. Conduction electron spin resonance in AlB2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:216001. [PMID: 23628913 DOI: 10.1088/0953-8984/25/21/216001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This work reports on electron spin resonance experiments in oriented single crystals of the hexagonal AlB2 diboride compound (P6/mmm, D16h structure) which display conduction electron spin resonance. The X-band electron spin resonance spectra showed a metallic Dysonian resonance with g-value and intensity independent of temperature. The thermal broadening of the anisotropic electron spin resonance linewidth ΔH tracks the T-dependence of the electrical resistivity below T is approximately equal to 100 K. These results confirm the observation of a conduction electron spin resonance in AlB2 and are discussed in comparison with other boride compounds. Based on our main findings for AlB2 and the calculated electronic structure of similar layered honeycomb-like structures, we conclude that any array of covalent B-B layers potentially results in a conduction electron spin resonance signal. This observation may shed new light on the nature of the non-trivial conduction electron spin resonance-like signals of complex f-electron systems such as β-YbAlB4.
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Affiliation(s)
- L M Holanda
- Instituto de Fisica Gleb Wataghin, UNICAMP, Campinas, SP, Brazil
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O'Farrell ECT, Matsumoto Y, Nakatsuji S. Evolution of c-f hybridization and two-component Hall effect in β-YbAlB4. PHYSICAL REVIEW LETTERS 2012; 109:176405. [PMID: 23215210 DOI: 10.1103/physrevlett.109.176405] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Indexed: 06/01/2023]
Abstract
β-YbAlB(4) is the unique heavy fermion superconductor that exhibits unconventional quantum criticality without tuning in a strongly intermediate valence state. Despite the large coherence temperature, set by the peak of the longitudinal resistivity, our Hall effect measurements reveal that resonant skew scattering from incoherent local moments persists down to at least ~40 K, where the Hall coefficient exhibits a distinct minimum signaling another formation of coherence. The observation strongly suggests that the hybridization between f moments and conduction electrons has a two-component character with distinct Kondo or coherence scales T(K) of ~40 K and 200 K; this is confirmed by the magnetic field dependence of ρ(xy).
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Affiliation(s)
- E C T O'Farrell
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan 277-8581.
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