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Lorenzana J, Seibold G. Long-Lived Higgs Modes in Strongly Correlated Condensates. PHYSICAL REVIEW LETTERS 2024; 132:026501. [PMID: 38277611 DOI: 10.1103/physrevlett.132.026501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 12/02/2023] [Accepted: 12/14/2023] [Indexed: 01/28/2024]
Abstract
We investigate order parameter fluctuations in the Hubbard model within a time-dependent Gutzwiller approach. While in the weak coupling limit we find that the amplitude fluctuations are short-lived due to a degeneracy with the energy of the edge of the quasiparticle continua (and in agreement with Hartree-Fock+RPA theory), these are shifted below the edge upon increasing the interaction. Our calculations therefore predict undamped amplitude (Higgs) oscillations of the order parameter in strongly coupled superconductors, cold atomic fermion condensates, and strongly interacting charge- and spin-density wave systems. We propose an experimental realization for the detection of the spin-type Higgs mode in undoped cuprates and related materials where, due to the Dzyaloshinsky-Moriya interaction, it can couple to an out-of-plane ferromagnetic excitation that is visible via the Faraday effect.
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Affiliation(s)
- J Lorenzana
- ISC-CNR and Department of Physics, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - G Seibold
- Institut Für Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany
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2
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Hepting M, Bejas M, Nag A, Yamase H, Coppola N, Betto D, Falter C, Garcia-Fernandez M, Agrestini S, Zhou KJ, Minola M, Sacco C, Maritato L, Orgiani P, Wei HI, Shen KM, Schlom DG, Galdi A, Greco A, Keimer B. Gapped Collective Charge Excitations and Interlayer Hopping in Cuprate Superconductors. PHYSICAL REVIEW LETTERS 2022; 129:047001. [PMID: 35938998 DOI: 10.1103/physrevlett.129.047001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 03/29/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
We use resonant inelastic x-ray scattering to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr_{0.9}La_{0.1}CuO_{2}. We detect a plasmon gap of ∼120 meV at the two-dimensional Brillouin zone center, indicating that low-energy plasmons in Sr_{0.9}La_{0.1}CuO_{2} are not strictly acoustic. The plasmon dispersion, including the gap, is accurately captured by layered t-J-V model calculations. A similar analysis performed on recent resonant inelastic x-ray scattering data from other cuprates suggests that the plasmon gap is generic and its size is related to the magnitude of the interlayer hopping t_{z}. Our work signifies the three dimensionality of the charge dynamics in layered cuprates and provides a new method to determine t_{z}.
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Affiliation(s)
- M Hepting
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - M Bejas
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - A Nag
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - H Yamase
- International Center of Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0047, Japan
- Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - N Coppola
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
| | - D Betto
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - C Falter
- Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | | | - S Agrestini
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - Ke-Jin Zhou
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - M Minola
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - C Sacco
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
| | - L Maritato
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano (Salerno), Italy
| | - P Orgiani
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano (Salerno), Italy
- CNR-IOM, TASC Laboratory in Area Science Park, 34139 Trieste, Italy
| | - H I Wei
- LASSP, Department of Physics, Cornell University, Ithaca, New York 14853, USA
| | - K M Shen
- LASSP, Department of Physics, Cornell University, Ithaca, New York 14853, USA
| | - D G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
- Leibniz-Institut für Kristallzüchtung, Max-Born-Straße 2, 12489 Berlin, Germany
| | - A Galdi
- Dipartimento di Ingegneria Industriale, Università di Salerno, I-84084 Fisciano (Salerno), Italy
- Cornell Laboratory for Accelerator Based Sciences and Education, Cornell University, Ithaca, New York 14853, USA
| | - A Greco
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - B Keimer
- Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
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3
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Nag A, Zhu M, Bejas M, Li J, Robarts HC, Yamase H, Petsch AN, Song D, Eisaki H, Walters AC, García-Fernández M, Greco A, Hayden SM, Zhou KJ. Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering. PHYSICAL REVIEW LETTERS 2020; 125:257002. [PMID: 33416344 DOI: 10.1103/physrevlett.125.257002] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 10/18/2020] [Accepted: 11/13/2020] [Indexed: 06/12/2023]
Abstract
High T_{c} superconductors show a rich variety of phases associated with their charge degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons in these layered cuprate superconductors. While charge ordering has been observed for both hole- and electron-doped cuprates, acoustic plasmons have only been found in electron-doped materials. Here, we use resonant inelastic x-ray scattering to observe the presence of acoustic plasmons in two families of hole-doped cuprate superconductors (La_{1.84}Sr_{0.16}CuO_{4} and Bi_{2}Sr_{1.6}La_{0.4}CuO_{6+δ}), crucially completing the picture. Interestingly, in contrast to the quasistatic charge ordering which manifests at both Cu and O sites, the observed acoustic plasmons are predominantly associated with the O sites, revealing a unique dichotomy in the behavior of valence charges in hole-doped cuprates.
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Affiliation(s)
- Abhishek Nag
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | - M Zhu
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - Matías Bejas
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - J Li
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H C Robarts
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - Hiroyuki Yamase
- International Center of Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0047, Japan
- Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - A N Petsch
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - D Song
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8560, Japan
| | - H Eisaki
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8560, Japan
| | - A C Walters
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
| | | | - Andrés Greco
- Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física de Rosario (UNR-CONICET), Avenida Pellegrini 250, 2000 Rosario, Argentina
| | - S M Hayden
- H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - Ke-Jin Zhou
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
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Boulanger ME, Grissonnanche G, Badoux S, Allaire A, Lefrançois É, Legros A, Gourgout A, Dion M, Wang CH, Chen XH, Liang R, Hardy WN, Bonn DA, Taillefer L. Thermal Hall conductivity in the cuprate Mott insulators Nd 2CuO 4 and Sr 2CuO 2Cl 2. Nat Commun 2020; 11:5325. [PMID: 33087726 PMCID: PMC7577976 DOI: 10.1038/s41467-020-18881-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 09/17/2020] [Indexed: 12/04/2022] Open
Abstract
The heat carriers responsible for the unexpectedly large thermal Hall conductivity of the cuprate Mott insulator La2CuO4 were recently shown to be phonons. However, the mechanism by which phonons in cuprates acquire chirality in a magnetic field is still unknown. Here, we report a similar thermal Hall conductivity in two cuprate Mott insulators with significantly different crystal structures and magnetic orders – Nd2CuO4 and Sr2CuO2Cl2 – and show that two potential mechanisms can be excluded – the scattering of phonons by rare-earth impurities and by structural domains. Our comparative study further reveals that orthorhombicity, apical oxygens, the tilting of oxygen octahedra and the canting of spins out of the CuO2 planes are not essential to the mechanism of chirality. Our findings point to a chiral mechanism coming from a coupling of acoustic phonons to the intrinsic excitations of the CuO2 planes. What makes the phonons in cuprates become chiral, as measured by their thermal Hall effect, is an unresolved question. Here, the authors rule out two extrinsic mechanisms and argue that chirality comes from a coupling of acoustic phonons to the intrinsic excitations of the CuO2 planes.
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Affiliation(s)
- Marie-Eve Boulanger
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Gaël Grissonnanche
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Sven Badoux
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Andréanne Allaire
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Étienne Lefrançois
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Anaëlle Legros
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada.,SPEC, CEA, CNRS-UMR3680, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Adrien Gourgout
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Maxime Dion
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - C H Wang
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - X H Chen
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
| | - R Liang
- Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
| | - W N Hardy
- Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
| | - D A Bonn
- Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
| | - Louis Taillefer
- Institut Quantique, Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada. .,Canadian Institute for Advanced Research, Toronto, ON, M5G 1M1, Canada.
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Freeman PG, Giblin SR, Skoulatos M, Mole RA, Prabhakaran D. Wave Vector Difference of Magnetic Bragg Reflections and Low Energy Magnetic Excitations in Charge-stripe Ordered La2NiO4.11. Sci Rep 2019; 9:14468. [PMID: 31594985 PMCID: PMC6783545 DOI: 10.1038/s41598-019-50904-8] [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: 05/17/2019] [Accepted: 09/10/2019] [Indexed: 11/09/2022] Open
Abstract
We report on the magnetism of charge-stripe ordered La2NiO4.11±0.01 by neutron scattering and μSR. On going towards zero energy transfer there is an observed wave vector offset in the centring of the magnetic excitations and magnetic Bragg reflections, meaning the excitations cannot be described as Goldstone modes of the magnetic order. Weak transverse field μSR measurements determine the magnetically order volume fraction is 87% from the two stripe twins, and the temperature evolution of the magnetic excitations is consistent with the low energy excitations coming from the magnetically ordered volume of the material. We will discuss how these results contrast with the proposed origin of a similar wave vector offset recently observed in a La-based cuprate, and possible origins of this effect in La2NiO4.11.
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Abstract
We present an overview of the microscopic theory of the Dzyaloshinskii–Moriya (DM) coupling in strongly correlated 3d compounds. Most attention in the paper centers around the derivation of the Dzyaloshinskii vector, its value, orientation, and sense (sign) under different types of the (super)exchange interaction and crystal field. We consider both the Moriya mechanism of the antisymmetric interaction and novel contributions, in particular, that of spin–orbital coupling on the intermediate ligand ions. We have predicted a novel magnetic phenomenon, weak ferrimagnetism in mixed weak ferromagnets with competing signs of Dzyaloshinskii vectors. We revisit a problem of the DM coupling for a single bond in cuprates specifying the local spin–orbital contributions to the Dzyaloshinskii vector focusing on the oxygen term. We predict a novel puzzling effect of the on-site staggered spin polarization to be a result of the on-site spin–orbital coupling and the cation-ligand spin density transfer. The intermediate ligand nuclear magnetic resonance (NMR) measurements are shown to be an effective tool to inspect the effects of the DM coupling in an external magnetic field. We predict the effect of a strong oxygen-weak antiferromagnetism in edge-shared CuO 2 chains due to uncompensated oxygen Dzyaloshinskii vectors. We revisit the effects of symmetric spin anisotropy directly induced by the DM coupling. A critical analysis will be given of different approaches to exchange-relativistic coupling based on the cluster and the DFT (density functional theory) based calculations. Theoretical results are applied to different classes of 3d compounds from conventional weak ferromagnets ( α -Fe 2 O 3 , FeBO 3 , FeF 3 , RFeO 3 , RCrO 3 , ...) to unconventional systems such as weak ferrimagnets (e.g., RFe 1 - x Cr x O 3 ), helimagnets (e.g., CsCuCl 3 ), and parent cuprates (La 2 CuO 4 , ...).
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7
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Sarkar S, Chaudhury R, Paul SK. Semi-phenomenological analysis of neutron scattering results for quasi-two dimensional quantum anti-ferromagnet. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 2017; 421:207-215. [DOI: 10.1016/j.jmmm.2016.08.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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8
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Viskadourakis Z, Sunku SS, Mukherjee S, Andersen BM, Ito T, Sasagawa T, Panagopoulos C. Ferroelectricity in underdoped La-based cuprates. Sci Rep 2015; 5:15268. [PMID: 26486276 PMCID: PMC4614081 DOI: 10.1038/srep15268] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 09/03/2015] [Indexed: 12/02/2022] Open
Abstract
Doping a “parent” antiferromagnetic Mott insulator in cuprates leads to short-range electronic correlations and eventually to high-Tc superconductivity. However, the nature of charge correlations in the lightly doped cuprates remains unclear. Understanding the intermediate electronic phase in the phase diagram (between the parent insulator and the high-Tc superconductor) is expected to elucidate the complexity both inside and outside the superconducting dome, and in particular in the underdoped region. One such phase is ferroelectricity whose origin and relation to the properties of high-Tc superconductors is subject of current research. Here we demonstrate that ferroelectricity and the associated magnetoelectric coupling are in fact common in La-214 cuprates namely, La2-xSrxCuO4, La2LixCu1-xO4 and La2CuO4+x. It is proposed that ferroelectricity may result from local CuO6 octahedral distortions, associated with the dopant atoms and clustering of the doped charge carriers, which break spatial inversion symmetry at the local scale whereas magnetoelectric coupling can be tuned through Dzyaloshinskii-Moriya interaction.
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Affiliation(s)
- Z Viskadourakis
- Crete Center for Quantum Complexity and Nanotechnology, University of Crete, Heraklion 71003, Greece.,IESL-FORTH, Vassilika Vouton, Heraklion 71110, Greece
| | - S S Sunku
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - S Mukherjee
- Niels Bohr Institute, University of Copenhagen, Copenhagen DK-2100, Denmark
| | - B M Andersen
- Niels Bohr Institute, University of Copenhagen, Copenhagen DK-2100, Denmark
| | - T Ito
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8562, Japan
| | - T Sasagawa
- Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan
| | - C Panagopoulos
- Crete Center for Quantum Complexity and Nanotechnology, University of Crete, Heraklion 71003, Greece.,Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.,Department of Physics, University of Crete, Heraklion 71003, Greece
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Shi X, Logvenov G, Bollinger AT, Božović I, Panagopoulos C, Popović D. Emergence of superconductivity from the dynamically heterogeneous insulating state in La(2-x)Sr(x)CuO4. NATURE MATERIALS 2013; 12:47-51. [PMID: 23160270 DOI: 10.1038/nmat3487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 10/09/2012] [Indexed: 06/01/2023]
Abstract
A central issue for copper oxides is the nature of the insulating ground state at low carrier densities and the emergence of high-temperature superconductivity from that state with doping. Even though this superconductor-insulator transition (SIT) is a zero-temperature transition, measurements are not usually carried out at low temperatures. Here we use magnetoresistance to probe both the insulating state at very low temperatures and the presence of superconducting fluctuations in La(2-x)Sr(x)CuO(4) films, for doping levels that range from the insulator to the superconductor (x = 0.03-0.08). We observe that the charge glass behaviour, characteristic of the insulating state, is suppressed with doping, but it coexists with superconducting fluctuations that emerge already on the insulating side of the SIT. The unexpected quenching of the superconducting fluctuations by the competing charge order at low temperatures provides a new perspective on the mechanism for the SIT.
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Affiliation(s)
- Xiaoyan Shi
- National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, USA
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Fujiyama S, Ohsumi H, Komesu T, Matsuno J, Kim BJ, Takata M, Arima T, Takagi H. Two-dimensional Heisenberg behavior of J(eff)=1/2 isospins in the paramagnetic state of the spin-orbital Mott insulator Sr2IrO4. PHYSICAL REVIEW LETTERS 2012; 108:247212. [PMID: 23004324 DOI: 10.1103/physrevlett.108.247212] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Indexed: 06/01/2023]
Abstract
The dynamical correlations of J(eff)=1/2 isospins in the paramagnetic state of spin-orbital Mott insulator Sr2IrO4 were revealed by resonant magnetic x-ray diffuse scattering. We found a two-dimensional antiferromagnetic fluctuation with a large in-plane correlation length exceeding 100 lattice spacings at even 20 K above the magnetic ordering temperature. In marked contrast to the naive expectation of the strong magnetic anisotropy associated with an enhanced spin-orbit coupling, we discovered an isotropic isospin correlation that is well described by the two-dimensional S=1/2 quantum Heisenberg model. The estimated antiferromagnetic coupling constant as large as J∼0.1 eV that is comparable to the small Mott gap (<0.5 eV) points out the weak and marginal Mott character of this spin-orbital entangled system.
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Affiliation(s)
- S Fujiyama
- RIKEN Advanced Science Institute, Wako 351-0198, Japan.
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Raičević I, Popović D, Panagopoulos C, Benfatto L, Silva Neto MB, Choi ES, Sasagawa T. Skyrmions in a doped antiferromagnet. PHYSICAL REVIEW LETTERS 2011; 106:227206. [PMID: 21702631 DOI: 10.1103/physrevlett.106.227206] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Indexed: 05/31/2023]
Abstract
Magnetization and magnetoresistance have been measured in insulating antiferromagnetic La2Cu0.97Li0.03O4 over a wide range of temperatures, magnetic fields, and field orientations. The magnetoresistance step associated with a weak ferromagnetic transition exhibits a striking nonmonotonic temperature dependence, consistent with the presence of Skyrmions.
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Affiliation(s)
- I Raičević
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
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12
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Maurice R, Pradipto AM, Guihéry N, Broer R, de Graaf C. Antisymmetric Magnetic Interactions in Oxo-Bridged Copper(II) Bimetallic Systems. J Chem Theory Comput 2010; 6:3092-101. [DOI: 10.1021/ct100329n] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- R. Maurice
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse 3, 118, route de Narbonne, 31062 Toulouse France, Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain, Zernike Institute for Advanced Materials, University of Groningen, Groningen 9747AG, The Netherlands, and Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys 23, 08010, Barcelona, Spain
| | - A. M. Pradipto
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse 3, 118, route de Narbonne, 31062 Toulouse France, Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain, Zernike Institute for Advanced Materials, University of Groningen, Groningen 9747AG, The Netherlands, and Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys 23, 08010, Barcelona, Spain
| | - N. Guihéry
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse 3, 118, route de Narbonne, 31062 Toulouse France, Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain, Zernike Institute for Advanced Materials, University of Groningen, Groningen 9747AG, The Netherlands, and Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys 23, 08010, Barcelona, Spain
| | - R. Broer
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse 3, 118, route de Narbonne, 31062 Toulouse France, Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain, Zernike Institute for Advanced Materials, University of Groningen, Groningen 9747AG, The Netherlands, and Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys 23, 08010, Barcelona, Spain
| | - C. de Graaf
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse 3, 118, route de Narbonne, 31062 Toulouse France, Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo s/n, 43007 Tarragona, Spain, Zernike Institute for Advanced Materials, University of Groningen, Groningen 9747AG, The Netherlands, and Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys 23, 08010, Barcelona, Spain
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13
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Ding JF, Yin YW, Xie L, Yu QX, Li XG. Spin structure transition in La(1.6-x)Nd(0.4)Sr(x)CuO(4) superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:275701. [PMID: 21399264 DOI: 10.1088/0953-8984/22/27/275701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The field and temperature dependencies of the spin structures in the normal states of La(1.6-x)Nd(0.4)Sr(x)CuO(4) (x = 0.10, 0.12, and 0.15) single crystals have been studied by measuring the magnetoresistance and susceptibility. A negative magnetoresistance appears just below the spin-ordering temperature for the magnetic fields parallel to the CuO(2) plane, which can be attributed to the spin-flop transition of the special spin structure in the normal state of the system. The anisotropic variations of susceptibilities with temperature for all the three specimens can be described in the framework of the crystal-field theory. The well fitted broad peaks of the in-plane susceptibilities χ(ab) for the specimens suggest that the susceptibilities are dominated by Nd(3+), and thus the spin reorientation of Cu(2+) in the CuO(2) plane can not be observed from the study of the susceptibility.
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Affiliation(s)
- J F Ding
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
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14
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Affiliation(s)
- Guo-meng Zhao
- a Physik-Institut der Universität Zürich , CH-8057 Zürich, Switzerland
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15
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Tamura M, Kato R. Variety of valence bond states formed of frustrated spins on triangular lattices based on a two-level system Pd(dmit) 2. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2009; 10:024304. [PMID: 27877277 PMCID: PMC5090434 DOI: 10.1088/1468-6996/10/2/024304] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2008] [Revised: 07/06/2009] [Accepted: 11/04/2008] [Indexed: 05/30/2023]
Abstract
Recent studies on the physical properties of the triangular system based on the Pd(dmit)2 salts (dmit=1,3-dithiole-2-thione-4,5-dithiolate) are reviewed. Quantum chemical architectures of the Pd(dmit)2 molecule and its dimer are introduced with emphasis on the strong dimerization of a two-level system, which provides unique physical properties of the salts. The magnetic properties are outlined in view of the magneto-structural correlation specific to the frustrated spin systems. Some newly discovered ground states and their origins are discussed, for which the valence bond formation plays a key role. Among them, the two-level structure is crucial for the novel charge-separated state found in two salts. The valence bond ordering, similar to the spin-Peierls transition, has been found in a two-dimensional frustrated spin system. The physical aspects and possible relation to the pressure-induced superconductivity are discussed.
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Affiliation(s)
- Masafumi Tamura
- Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - Reizo Kato
- Condensed Molecular Materials Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
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16
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Bohnenbuck B, Zegkinoglou I, Strempfer J, Nelson CS, Wu HH, Schübler-Langeheine C, Reehuis M, Schierle E, Leininger P, Herrmannsdörfer T, Lang JC, Srajer G, Lin CT, Keimer B. Magnetic structure of RuSr2GdCu2O8 determined by resonant x-ray diffraction. PHYSICAL REVIEW LETTERS 2009; 102:037205. [PMID: 19257388 DOI: 10.1103/physrevlett.102.037205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Indexed: 05/27/2023]
Abstract
X-ray diffraction with photon energies near the Ru L2-absorption edge was used to detect resonant reflections characteristic of a G-type superstructure in RuSr2GdCu2O8 single crystals. A polarization analysis confirms that these reflections are due to magnetic order of Ru moments, and the azimuthal-angle dependence of the scattering amplitude reveals that the moments lie along a low-symmetry axis with substantial components parallel and perpendicular to the RuO2 layers. Complemented by susceptibility data and a symmetry analysis of the magnetic structure, these results reconcile many of the apparently contradictory findings reported in the literature.
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Affiliation(s)
- B Bohnenbuck
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
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17
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Jackeli G, Khaliullin G. Mott insulators in the strong spin-orbit coupling limit: from Heisenberg to a quantum compass and Kitaev models. PHYSICAL REVIEW LETTERS 2009; 102:017205. [PMID: 19257237 DOI: 10.1103/physrevlett.102.017205] [Citation(s) in RCA: 398] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2008] [Indexed: 05/13/2023]
Abstract
We study the magnetic interactions in Mott-Hubbard systems with partially filled t_{2g} levels and with strong spin-orbit coupling. The latter entangles the spin and orbital spaces, and leads to a rich variety of the low energy Hamiltonians that extrapolate from the Heisenberg to a quantum compass model depending on the lattice geometry. This gives way to "engineer" in such Mott insulators an exactly solvable spin model by Kitaev relevant for quantum computation. We, finally, explain "weak" ferromagnetism, with an anomalously large ferromagnetic moment, in Sr2IrO4.
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Affiliation(s)
- G Jackeli
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
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18
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Raicević I, Jaroszyński J, Popović D, Panagopoulos C, Sasagawa T. Evidence for charge glasslike behavior in lightly doped La2-xSrxCuO4 at low temperatures. PHYSICAL REVIEW LETTERS 2008; 101:177004. [PMID: 18999777 DOI: 10.1103/physrevlett.101.177004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2008] [Indexed: 05/27/2023]
Abstract
A c-axis magnetotransport and resistance noise study in La_(1.97)Sr_(0.03)CuO_(4) reveals clear signatures of glassiness, such as hysteresis, memory, and slow, correlated dynamics, but only at temperatures (T) well below the spin glass transition temperature T_(sg). The results strongly suggest the emergence of charge glassiness, or dynamic charge ordering, as a result of Coulomb interactions.
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Affiliation(s)
- I Raicević
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
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19
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Wu T, Wang CH, Wu G, Fang DF, Luo JL, Liu GT, Chen XH. Giant anisotropy of the magnetoresistance and the 'spin valve' effect in antiferromagnetic Nd(2-x)Ce(x)CuO(4). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:275226. [PMID: 21694387 DOI: 10.1088/0953-8984/20/27/275226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have studied anisotropic magnetoresistance (MR) and magnetization with a rotating magnetic field (B) within the CuO(2) plane in lightly doped AF Nd(2-x)Ce(x)CuO(4). A giant anisotropy in the MR is observed at low temperature, below 5 K. The c-axis resistivity can be tuned over about one order of magnitude just by changing the B direction within the CuO(2) plane, and a scaling behavior for the out-of-plane and in-plane MR is found. A 'spin valve' effect is proposed for explaining the giant anisotropy of the out-of-plane MR and the evolution of the scaling parameters with the external field. It is found that the field-induced spin-flop transition of the Nd(3+) layer under high magnetic field is the key to understanding the giant anisotropy. These results suggest that a novel entanglement of charge and spin dominates the underlying physics.
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Affiliation(s)
- T Wu
- Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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20
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Wilson JA. Structural matters in HTSC: the origin and form of stripe organization and checkerboarding. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2006; 18:R69-R99. [PMID: 21697557 DOI: 10.1088/0953-8984/18/6/r02] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The paper deals with the controversial charge and spin self-organization phenomena in the HTSC cuprates, of which neutron, x-ray, STM and ARPES experiments give complementary, sometimes apparently contradictory glimpses. The examination has been set in the context of the boson-fermion, negative-U understanding of HTSC advocated over many years by the author. Stripe models are developed which are 2-q in nature and diagonal in form. For such a geometry to be compatible with the data rests upon both the spin and charge arrays being face-centred. Various special doping concentrations are closely looked at, in particular p = 0.1836 or 9/49, which is associated with the maximization of the superconducting condensation energy and the termination of the pseudogap regime. The stripe models are dictated by real space organization of the holes, whereas the dispersionless checkerboarding is interpreted in terms of correlation driven collapse of normal Fermi surface behaviour and response functions. The incommensurate spin diffraction below the 'resonance energy' is seen as in no way expressing spin-wave physics or Fermi surface nesting, but is driven by charge and strain (Jahn-Teller) considerations, and it stands virtually without dispersion. The apparent dispersion comes from the downward dispersion of the resonance peak, and the growth of a further incoherent commensurate peak pursuant upon the falling level of charge stripe organization under excitation.
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Affiliation(s)
- John A Wilson
- H H Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK
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21
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Wu C, Zaanen J, Zhang SC. Spin-orbit coupling-induced magnetic phase in the d-density-wave phase of La(2-x)Ba(x)CuO4 superconductors. PHYSICAL REVIEW LETTERS 2005; 95:247007. [PMID: 16384414 DOI: 10.1103/physrevlett.95.247007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2005] [Indexed: 05/05/2023]
Abstract
We study the effects of spin-orbit coupling in the d-density wave (DDW) phase. In the low-temperature orthorhombic phase of La(2-x)Ba(x)CuO4, we find that spin-orbit coupling induces ferromagnetic moments in the DDW phase, which are polarized along the [110] direction with a considerable magnitude. This effect does not exist in the superconducting phase. On the other hand, if the d-density wave order does not exist at zero field, a magnetic field along the [110] direction always induces such a staggered orbital current. We discuss experimental constraints on the DDW states in light of our theoretical predictions.
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Affiliation(s)
- Congjun Wu
- Department of Physics, McCullough Building, Stanford University, Stanford, California 94305-4045, USA
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22
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Bartlett BM, Nocera DG. Long-Range Magnetic Ordering in Iron Jarosites Prepared by Redox-Based Hydrothermal Methods. J Am Chem Soc 2005; 127:8985-93. [PMID: 15969575 DOI: 10.1021/ja050205d] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The iron jarosites, plumbojarosite, Pb0.5Fe3(OH)6(SO4)2, argentojarosite, AgFe3(OH)6(SO4)2, and thallium jarosite, TlFe3(OH)6(SO4)2, along with the selenate-capped jarosite analogues of potassium, KFe3(OH)6(SeO4)2, and rubidium, RbFe3(OH)6(SeO4)2, have been prepared in their analytically pure forms by employing redox-based hydrothermal methods. The crystal structures of these materials have been determined, and all are found to be essentially isostructrual including Pb0.5Fe3(OH)6(SO4)2, which is distinct from the structure reported for naturally mined samples. All iron jarosites show long-range order (LRO), signified by a sharp transition temperature, T(N), which falls in the narrow temperature range of 61.4 +/- 5 K. The mechanism responsible for this ordering has been established by examining magnetostructural correlations for the jarosites possessing various interlayer cation and capping groups. We show that all magnetic properties of jarosites, including LRO, find their origin in the basic magnetic unit, the intralayer Fe3(mu-OH)3 triangle. Field-dependent magnetization experiments are consistent with the antiferromagnetic stacking of an out of plane moment developed from spin canting within Fe3(mu-OH)3 triangles. Together with the previously reported AFe3(OH)6(SO4)2 (A = Na+, K+, Rb+ and NH4+) jarosites, these compounds provide a framework for probing magnetic ordering in a spin frustrated lattice of the largest series of isoelectronic and isostructural kagomé systems yet discovered.
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Affiliation(s)
- Bart M Bartlett
- Department of Chemistry, 6-335, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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23
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Grohol D, Matan K, Cho JH, Lee SH, Lynn JW, Nocera DG, Lee YS. Spin chirality on a two-dimensional frustrated lattice. NATURE MATERIALS 2005; 4:323-328. [PMID: 15793572 DOI: 10.1038/nmat1353] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2004] [Accepted: 02/08/2005] [Indexed: 05/24/2023]
Abstract
The collective behaviour of interacting magnetic moments can be strongly influenced by the topology of the underlying lattice. In geometrically frustrated spin systems, interesting chiral correlations may develop that are related to the spin arrangement on triangular plaquettes. We report a study of the spin chirality on a two-dimensional geometrically frustrated lattice. Our new chemical synthesis methods allow us to produce large single-crystal samples of KFe3(OH)6(SO4)2, an ideal Kagomé lattice antiferromagnet. Combined thermodynamic and neutron scattering measurements reveal that the phase transition to the ordered ground-state is unusual. At low temperatures, application of a magnetic field induces a transition between states with different non-trivial spin-textures.
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Affiliation(s)
- Daniel Grohol
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Luo JL, Wang NL, Liu GT, Wu D, Jing XN, Hu F, Xiang T. Metamagnetic transition in Na 0.85 CoO2 single crystals. PHYSICAL REVIEW LETTERS 2004; 93:187203. [PMID: 15525203 DOI: 10.1103/physrevlett.93.187203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Indexed: 05/24/2023]
Abstract
We report the magnetization, specific heat, and transport measurements of a high quality Na(0.85)CoO2 single crystal in applied magnetic fields up to 14 T. At high temperatures, the system is in a paramagnetic phase. It undergoes a magnetic phase transition below approximately 20 K. For the field H||c, the measurement data of magnetization, specific heat, and magnetoresistance reveal a metamagnetic transition from an antiferromagnetic state to a quasiferromagnetic state at about 8 T at low temperatures. However, no transition is observed in the magnetization measurements up to 14 T for H perpendicular c. The low temperature magnetic phase diagram of Na(0.85)CoO2 is determined.
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Affiliation(s)
- J L Luo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
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25
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Smith DF, Slichter CP, Schlueter JA, Kini AM, Daugherty RG. Precise determination of the orientation of the Dzialoshinskii-Moriya vector in kappa-(BEDT-TTF)2Cu[N(CN)(2)]Cl. PHYSICAL REVIEW LETTERS 2004; 93:167002. [PMID: 15525021 DOI: 10.1103/physrevlett.93.167002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2004] [Indexed: 05/24/2023]
Abstract
A novel electron spin-reorientation transition is discovered by 13C NMR in the quasi-two-dimensional organic antiferromagnet kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl. The spin reorientation occurs as an external field is swept through the orientation of the characteristic vector of the Dzialoshinskii-Moriya (DM) interaction, thus providing a precise determination of the orientation of the DM vector. Such a spin reorientation could help to characterize the DM interaction in other antiferromagnetic systems.
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Affiliation(s)
- Dylan F Smith
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
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26
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Gozar A, Dennis BS, Blumberg G, Komiya S, Ando Y. Magnetic order in lightly doped La2-xSrxCuO4. PHYSICAL REVIEW LETTERS 2004; 93:027001. [PMID: 15323941 DOI: 10.1103/physrevlett.93.027001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2003] [Indexed: 05/24/2023]
Abstract
We study long wavelength magnetic excitations in lightly doped La2-xSrxCuO4 (x</=0.03) detwinned crystals. The lowest energy magnetic anisotropy induced gap can be understood in terms of the antisymmetric spin interaction inside the antiferromagnetic (AF) phase. The second magnetic resonance, analyzed in terms of in-plane spin anisotropy, shows unconventional behavior within the AF state; it led to the discovery of collective spin excitations pertaining to a field induced magnetically ordered state. This state persists in a 9 T field to more than 100 K above the Néel temperature in x=0.01.
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Affiliation(s)
- A Gozar
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
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27
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Lavrov AN, Kang HJ, Kurita Y, Suzuki T, Komiya S, Lynn JW, Lee SH, Dai P, Ando Y. Spin-flop transition and the anisotropic magnetoresistance of Pr(1.3-x)La(0.7)CexCuO4: unexpectedly strong spin-charge coupling in the electron-doped cuprates. PHYSICAL REVIEW LETTERS 2004; 92:227003. [PMID: 15245253 DOI: 10.1103/physrevlett.92.227003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2003] [Indexed: 05/24/2023]
Abstract
We use transport and neutron-scattering measurements to show that a magnetic-field-induced transition from noncollinear to collinear spin arrangement in adjacent CuO2 planes of lightly electron-doped Pr(1.3-x)La(0.7)CexCuO4 (x=0.01) crystals affects significantly both the in-plane and out-of-plane resistivity. In the high-field collinear state, the magnetoresistance (MR) does not saturate but exhibits an intriguing fourfold-symmetric angular dependence, oscillating from being positive at B//[100] to being negative at B//[110]. The observed MR of more than 30% at low temperatures induced by a modest modification of the spin structure indicates an unexpectedly strong spin-charge coupling in electron-doped cuprates.
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Affiliation(s)
- A N Lavrov
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
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28
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Ando Y, Lavrov AN, Komiya S. Anisotropic magnetoresistance in lightly doped La(2)-(x)Sr(x)CuO(4): impact of antiphase domain boundaries on the electron transport. PHYSICAL REVIEW LETTERS 2003; 90:247003. [PMID: 12857217 DOI: 10.1103/physrevlett.90.247003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2002] [Indexed: 05/24/2023]
Abstract
Detailed behavior of the magnetoresistance (MR) is studied in lightly doped antiferromagnetic La(1.99)Sr(0.01)CuO(4), where, thanks to the weak-ferromagnetic moment due to spin canting, the antiferromagnetic (AF) domain structure can be manipulated by the magnetic field. The MR behavior demonstrates that CuO(2) planes indeed contain antiphase AF-domain boundaries in which charges are confined, forming antiphase stripes. The data suggest that a high magnetic field turns the antiphase stripes into in-phase stripes, and the latter appear to give better conduction than the former, which challenges the notion that the antiphase character of stripes facilitates charge motion.
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Affiliation(s)
- Yoichi Ando
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
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29
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Taskin AA, Lavrov AN, Ando Y. Ising-like spin anisotropy and competing antiferromagnetic-ferromagnetic orders in GdBaCo2O5.5 single crystals. PHYSICAL REVIEW LETTERS 2003; 90:227201. [PMID: 12857336 DOI: 10.1103/physrevlett.90.227201] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2002] [Indexed: 05/24/2023]
Abstract
In RBaCo2O5+x compounds (R is rare earth), a ferromagnetic-antiferromagnetic competition is accompanied by a giant magnetoresistance. We study the magnetization of detwinned GdBaCo2O5.5 single crystals and find a remarkable uniaxial anisotropy of Co3+ spins which is tightly linked with the chain oxygen ordering in GdO0.5 planes. Reflecting the underlying oxygen order, CoO2 planes also develop a spin-state order consisting of Co3+ ions in alternating rows of S=1 and S=0 states. The magnetic structure appears to be composed of weakly coupled ferromagnetic ladders with Ising-like moments, which gives a simple picture for magnetotransport phenomena.
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Affiliation(s)
- A A Taskin
- Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
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30
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Hess C, Büchner B, Ammerahl U, Colonescu L, Heidrich-Meisner F, Brenig W, Revcolevschi A. Magnon heat transport in doped La2CuO4. PHYSICAL REVIEW LETTERS 2003; 90:197002. [PMID: 12785973 DOI: 10.1103/physrevlett.90.197002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2003] [Indexed: 05/24/2023]
Abstract
We present results of the thermal conductivity of La2CuO4 and La(1.8)Eu(0.2)CuO4 single crystals which represent model systems for the two-dimensional spin-1/2 Heisenberg antiferromagnet on a square lattice. We find large anisotropies of the thermal conductivity which are explained in terms of two-dimensional heat conduction by magnons within the CuO2 planes. Nonmagnetic Zn substituted for Cu gradually suppresses this magnon thermal conductivity kappa(mag). A semiclassical analysis of kappa(mag) is shown to yield a magnon mean free path which scales linearly with the reciprocal concentration of Zn ions.
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Affiliation(s)
- C Hess
- 2. Physikalisches Institut, RWTH-Aachen, 52056 Aachen, Germany.
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31
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Lavrov AN, Ando Y, Komiya S, Tsukada I. Unusual magnetic susceptibility anisotropy in untwinned La2-xSr(x)CuO4 single crystals in the lightly doped region. PHYSICAL REVIEW LETTERS 2001; 87:017007. [PMID: 11461491 DOI: 10.1103/physrevlett.87.017007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2001] [Indexed: 05/23/2023]
Abstract
We present a study of the magnetic susceptibility chi in carefully detwinned La 2-xSr(x)CuO4 single crystals in the lightly doped region (x = 0-0.03), which demonstrates a remarkable in-plane anisotropy of the spin system. This anisotropy, chi(a)/chi(b), is found to persist after the long-range antiferromagnetic (AF) order is destroyed by hole doping, suggesting that doped holes break the AF order into domains in which the spin alignment is kept essentially intact. It turns out that the freezing of the spins taking place at low temperatures is also notably anisotropic, implying that the "spin-glass" feature is governed by the domain structure as well.
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Affiliation(s)
- A N Lavrov
- Central Research Institute of Electric Power Industry, 2-11-1 Iwato-kita, Komae, Tokyo 201-8511 Japan
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32
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A Novel Mixed Valent Chromium-Layered Oxide with Peculiar Magnetic Properties: Sr4.5Cr2.5O9. J SOLID STATE CHEM 2000. [DOI: 10.1006/jssc.2000.8798] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Timm C, Bennemann KH. Doping dependence of the Neel temperature in mott-hubbard antiferromagnets: effect of vortices. PHYSICAL REVIEW LETTERS 2000; 84:4994-4997. [PMID: 10990850 DOI: 10.1103/physrevlett.84.4994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/1999] [Indexed: 05/23/2023]
Abstract
The rapid destruction of long-range antiferromagnetic order upon doping of Mott-Hubbard antiferromagnetic insulators is studied within a generalized Berezinskii-Kosterlitz-Thouless renormalization group theory in accordance with recent calculations suggesting that holes dress with vortices. We calculate the doping-dependent Neel temperature in good agreement with experiments for high- T(c) cuprates. Interestingly, the critical doping where long-range order vanishes at zero temperature is predicted to be x(c) approximately 0. 02, independently of any energy scales of the system.
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Affiliation(s)
- C Timm
- Institut fur Theoretische Physik, Freie Universitat Berlin, Arnimallee 14, D-14195 Berlin, Germany
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34
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Introduction to Electronic States in Oxides and an Overview of Transport Properties. ACTA ACUST UNITED AC 2000. [DOI: 10.1007/978-3-662-04011-9_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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35
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Manuel LO, Gazza CJ, Trumper AE, Ceccatto HA. Heisenberg model with Dzyaloshinskii-Moriya interaction: A mean-field Schwinger-boson study. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:12946-12952. [PMID: 9985153 DOI: 10.1103/physrevb.54.12946] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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36
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Schnelle W, Büchner B, Gamper E, Stein M, Fernández-Díaz MT, Odier P. Thermal properties at the low-temperature structural and magnetic phase transitions in Pr2NiO4 crystals. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:9970-9976. [PMID: 9984733 DOI: 10.1103/physrevb.54.9970] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Inaguma Y, Itoh M, Oguni M, Kyômen T. Effect of oxygen content on the anomalies at successive phase transitions of La2CuO4+ delta single crystal below 320 K. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:7455-7461. [PMID: 9984372 DOI: 10.1103/physrevb.54.7455] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Entin-Wohlman O, Harris AB, Aharony A. Magnetic anisotropies and general on-site Coulomb interactions in the cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:11661-11670. [PMID: 9982790 DOI: 10.1103/physrevb.53.11661] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yildirim T, Harris AB, Shender EF. Three-dimensional ordering in bct antiferromagnets due to quantum disorder. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:6455-6476. [PMID: 9982045 DOI: 10.1103/physrevb.53.6455] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Stein J, Entin-Wohlman O, Aharony A. Weak ferromagnetism in the low-temperature tetragonal phase of the cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:775-784. [PMID: 9983033 DOI: 10.1103/physrevb.53.775] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Salamon D, Abbamonte P, Liu R, Klein MV, Lee WC, Ginsberg DM, Tartakovskii II, Veal BW. Large-shift Raman scattering features in superconducting YBa2Cu3O6+x. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:886-891. [PMID: 9983045 DOI: 10.1103/physrevb.53.886] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Stein J. Nonlocal Coulomb interactions and the magnetic anisotropies in the low-temperature phases of the cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:785-790. [PMID: 9983034 DOI: 10.1103/physrevb.53.785] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Neutron scattering study of the two-dimensional spinS=1/2 square-lattice Heisenberg antiferromagnet Sr2CuO2Cl2. ACTA ACUST UNITED AC 1995. [DOI: 10.1007/bf01313844] [Citation(s) in RCA: 123] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Eastwood MP, Logan DE. Onsager reaction field theory of a spatially anisotropic Heisenberg model. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:9455-9461. [PMID: 9979992 DOI: 10.1103/physrevb.52.9455] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Yildirim T, Harris AB, Aharony A, Entin-Wohlman O. Anisotropic spin Hamiltonians due to spin-orbit and Coulomb exchange interactions. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:10239-10267. [PMID: 9980076 DOI: 10.1103/physrevb.52.10239] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ami T, Crawford MK, Harlow RL, Wang ZR, Johnston DC, Huang Q, Erwin RW. Magnetic susceptibility and low-temperature structure of the linear chain cuprate Sr2CuO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:5994-6001. [PMID: 9979515 DOI: 10.1103/physrevb.51.5994] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sumarlin IW, Lynn JW, Chattopadhyay T, Barilo SN, Zhigunov DI, Peng JL. Magnetic structure and spin dynamics of the Pr and Cu in Pr2CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:5824-5839. [PMID: 9979494 DOI: 10.1103/physrevb.51.5824] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kremer RK, Kanellakopulos B, Bele P, Brunner H, Neugebauer FA. Weak ferromagnetism and magnetically modulated microwave absorption at low magnetic fields in 1,3,5-triphenyl-6-oxoverdazyl. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)01137-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rouco A, Obradors X, Tovar M, Pérez F, Chateigner D, Bordet P. Magnetic phase diagram of Y2CuO4: Weak ferromagnetism and metamagnetic transition. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:9924-9936. [PMID: 9975073 DOI: 10.1103/physrevb.50.9924] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Büchner B, Breuer M, Freimuth A, Kampf AP. Critical buckling for the disappearance of superconductivity in rare-earth-doped La2-xSrxCuO4. PHYSICAL REVIEW LETTERS 1994; 73:1841-1844. [PMID: 10056900 DOI: 10.1103/physrevlett.73.1841] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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