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Lee S, Seo YS, Roh S, Song D, Eisaki H, Hwang J. Doping-dependent superconducting physical quantities of K-doped BaFe[Formula: see text]As[Formula: see text] obtained through infrared spectroscopy. Sci Rep 2022; 12:19950. [PMID: 36402847 PMCID: PMC9675795 DOI: 10.1038/s41598-022-24520-y] [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: 07/19/2022] [Accepted: 11/16/2022] [Indexed: 11/21/2022] Open
Abstract
We investigated four single crystals of K-doped BaFe[Formula: see text]As[Formula: see text] (Ba-122), Ba[Formula: see text]K[Formula: see text]Fe[Formula: see text]As[Formula: see text] with [Formula: see text] 0.29, 0.36, 0.40, and 0.51, using infrared spectroscopy. We explored a wide variety of doping levels, from under- to overdoped. We obtained the superfluid plasma frequencies ([Formula: see text]) and corresponding London penetration depths ([Formula: see text]) from the measured optical conductivity spectra. We also extracted the electron-boson spectral density (EBSD) functions using a two-parallel charge transport channel approach in the superconducting (SC) state. From the extracted EBSD functions, the maximum SC transition temperatures ([Formula: see text]) were determined using a generalized McMillan formula and the SC coherence lengths ([Formula: see text]) were calculated using the timescales encoded in the EBSD functions and reported Fermi velocities. We identified some similarities and differences in the doping-dependent SC quantities between the K-doped Ba-122 and the hole-doped cuprates. We expect that the various SC quantities obtained across the wide doping range will provide helpful information for establishing the microscopic pairing mechanism in Fe-pnictide superconductors.
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Affiliation(s)
- Seokbae Lee
- Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do 16419 Republic of Korea
| | - Yu-Seong Seo
- Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do 16419 Republic of Korea
| | - Seulki Roh
- Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do 16419 Republic of Korea
| | - Dongjoon Song
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8568 Japan
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826 Republic of Korea
| | - Hiroshi Eisaki
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8568 Japan
| | - Jungseek Hwang
- Department of Physics, Sungkyunkwan University, Suwon, Gyeonggi-do 16419 Republic of Korea
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2
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Maurya AK, Sarder MTH, Medhi A. Ground state of a three-band Hubbard model with Hund's coupling: Janus-faced behavior in presence of magnetic order. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:425603. [PMID: 34298529 DOI: 10.1088/1361-648x/ac1766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
We study the ground state of the three-band degenerate Hubbard model on a square lattice at integer fillings using the variational slave-spin mean field method. At half-filling, the method reproduces the well known result that the ground state is antiferromagnetic (AF) insulating at smaller values of Hubbard onsite repulsionU, while it becomes Mott insulating with Néel AF order at higherU. Away from half-filling, for two particles per site, we show that the model supports a ferromagnetic (FM) metallic state with fully polarized spins at sufficiently largeU. The FM state occurs irrespective of the value of Hund's couplingJ. The ferromagnetism atJ= 0 can be explained by the Stoner mechanism while that forJ> 0 is shown to arise from the superexchange process. At this band filling, the Hund's couplingJis known to have the Janus-faced effect on electronic correlations where it enhances correlations at smallerUwhile reducing it at higherU. We show that these two effects are separated by the paramagnetic (PM) to FM transition point. The former effect is obtained at the PM state while the latter occurs in the FM state. The FM phase also occurs for one particle per site but here Hund's couplingJreduces the effect of electronic correlations at allU.
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Affiliation(s)
- Arun Kumar Maurya
- Indian Institute of Science Education and Research Thiruvananthapuram, Kerala 695551, India
| | | | - Amal Medhi
- Indian Institute of Science Education and Research Thiruvananthapuram, Kerala 695551, India
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3
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Li Y, Xue J, Hu S, Pang H. Mössbauer spectroscopy study of nematicity in Ba(Fe 0.962Cu 0.038) 2As 2single crystal: enhanced orbital effect. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:205602. [PMID: 33684902 DOI: 10.1088/1361-648x/abeca7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
The origin of the nematic order remains unclear due to the strong coupling between orbital, spin and lattice degrees of freedom in iron-based superconductors. Although the driving force of hole-doped BeFe2As2is still controversial, the nematic fluctuation of electron-doped compounds is generally believed to be spin fluctuation driven. Here, we present a comprehensive study of the nematic phase transition in Ba(Fe0.962Cu0.038)2As2single crystal by using Mössbauer spectroscopy. The electric field gradient and its in-plane asymmetry on Fe nucleus, which are directly determined by the occupation of individualt2gorbital, are sensitive to the local nematicity of Fe ions. The nematic phase transition happens atTnem≈ 73.8 K in the compound while the band splitting betweendxz/dyzorbitals begins far aboveTnemand reaches 18.8 meV at 30 K. The temperature evolution of the hyperfine parameters proves the existence of electron-phonon interaction and non-Fermi-liquid behaviour nearTnem. However, the spin-lattice relaxation signal is only evident belowTnem. These observations show that the role of orbital degrees of freedom is more active in driving nematicity than in Co- or Ni-doped BaFe2As2compounds, and can be attributed to enhanced electronic localization caused by Cu doping.
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Affiliation(s)
- Yang Li
- Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Jijun Xue
- Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Shixin Hu
- Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Hua Pang
- Institute of Applied Magnetics, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China
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4
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Kang CJ, Kotliar G. Optical Properties of the Infinite-Layer La_{1-x}Sr_{x}NiO_{2} and Hidden Hund's Physics. PHYSICAL REVIEW LETTERS 2021; 126:127401. [PMID: 33834805 DOI: 10.1103/physrevlett.126.127401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 02/24/2021] [Indexed: 06/12/2023]
Abstract
We investigate the optical properties of the normal state of the infinite-layer La_{1-x}Sr_{x}NiO_{2} using density functional theory plus dynamical mean-field theory. We find a correlated metal which exhibits substantial transfer of spectral weight to high energies relative to the density functional theory. The correlations are not due to Mott physics, which would suppress the charge fluctuations and the integrated optical spectral weight as we approach a putative insulating state. Instead, we find the unusual situation, that the integrated optical spectral weight decreases with doping and increases with increasing temperature. We contrast this with the coherent component of the optical conductivity, which decreases with increasing temperature as a result of a coherence-incoherence crossover. Our studies reveal that the effective crystal field splitting is dynamical and increases strongly at low frequency. This leads to a picture of a Hund's metallic state, where dynamical orbital fluctuations are visible at intermediate energies, while at low energies a Fermi surface with primarily d_{x^{2}-y^{2}} character emerges. The infinite-layer nickelates are thus in an intermediate position between the iron based high temperature superconductors where multiorbital Hund's physics dominates and a one-band system such as the cuprates. To capture this physics we propose a low-energy two-band model with atom centered e_{g} states.
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Affiliation(s)
- Chang-Jong Kang
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08856, USA
- Department of Physics, Chungnam National University, Daejeon 34134, South Korea
| | - Gabriel Kotliar
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08856, USA
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
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5
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Lo Vecchio I, Baldassarre L, Di Pietro P, Giorgianni F, Marsi M, Perucchi A, Schade U, Lanzara A, Lupi S. Orbital dependent coherence temperature and optical anisotropy of V 2O 3 quasiparticles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:345602. [PMID: 28665290 DOI: 10.1088/1361-648x/aa7cd7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on an orbital and temperature dependent study of the onset of coherent quasiparticles in V2O3 single crystal. By using polarized infrared spectroscopy we demonstrate that the electronic coherence temperature is strongly orbital dependent, being about 400 K for [Formula: see text] orbitals and 500 K for the [Formula: see text]. This suggests that V2O3 low energy electrodynamics can be described in terms of two electron liquids differently renormalized by electronic correlations.
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Affiliation(s)
- I Lo Vecchio
- Dipartimento di Fisica, 'Sapienza' Università di Roma, Piazzale A. Moro 2, I-00185 Roma, Italy. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
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Liu M, Sternbach AJ, Basov DN. Nanoscale electrodynamics of strongly correlated quantum materials. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2017; 80:014501. [PMID: 27811387 DOI: 10.1088/0034-4885/80/1/014501] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Electronic, magnetic, and structural phase inhomogeneities are ubiquitous in strongly correlated quantum materials. The characteristic length scales of the phase inhomogeneities can range from atomic to mesoscopic, depending on their microscopic origins as well as various sample dependent factors. Therefore, progress with the understanding of correlated phenomena critically depends on the experimental techniques suitable to provide appropriate spatial resolution. This requirement is difficult to meet for some of the most informative methods in condensed matter physics, including infrared and optical spectroscopy. Yet, recent developments in near-field optics and imaging enabled a detailed characterization of the electromagnetic response with a spatial resolution down to 10 nm. Thus it is now feasible to exploit at the nanoscale well-established capabilities of optical methods for characterization of electronic processes and lattice dynamics in diverse classes of correlated quantum systems. This review offers a concise description of the state-of-the-art near-field techniques applied to prototypical correlated quantum materials. We also discuss complementary microscopic and spectroscopic methods which reveal important mesoscopic dynamics of quantum materials at different energy scales.
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Affiliation(s)
- Mengkun Liu
- Department of Physics, Stony Brook University, Stony Brook, NY 11794, USA
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7
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Band structure reconstruction across nematic order in high quality FeSe single crystal as revealed by optical spectroscopy study. Sci Bull (Beijing) 2016. [DOI: 10.1007/s11434-016-1102-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Mirri C, Dusza A, Bastelberger S, Chinotti M, Degiorgi L, Chu JH, Kuo HH, Fisher IR. Origin of the Resistive Anisotropy in the Electronic Nematic Phase of BaFe(2)As(2) Revealed by Optical Spectroscopy. PHYSICAL REVIEW LETTERS 2015; 115:107001. [PMID: 26382696 DOI: 10.1103/physrevlett.115.107001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Indexed: 06/05/2023]
Abstract
We perform, as a function of uniaxial stress, an optical-reflectivity investigation of the representative "parent" ferropnictide BaFe(2)As(2) in a broad spectral range, across the tetragonal-to-orthorhombic phase transition and the onset of the long-range antiferromagnetic (AFM) order. The infrared response reveals that the dc transport anisotropy in the orthorhombic AFM state is determined by the interplay between the Drude spectral weight and the scattering rate, but that the dominant effect is clearly associated with the metallic spectral weight. In the paramagnetic tetragonal phase, though, the dc resistivity anisotropy of strained samples is almost exclusively due to stress-induced changes in the Drude weight rather than in the scattering rate, definitively establishing the anisotropy of the Fermi surface parameters as the primary effect driving the dc transport properties in the electronic nematic state.
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Affiliation(s)
- C Mirri
- Laboratorium für Festkörperphysik, ETH-Zürich, 8093 Zürich, Switzerland
| | - A Dusza
- Laboratorium für Festkörperphysik, ETH-Zürich, 8093 Zürich, Switzerland
| | - S Bastelberger
- Laboratorium für Festkörperphysik, ETH-Zürich, 8093 Zürich, Switzerland
| | - M Chinotti
- Laboratorium für Festkörperphysik, ETH-Zürich, 8093 Zürich, Switzerland
| | - L Degiorgi
- Laboratorium für Festkörperphysik, ETH-Zürich, 8093 Zürich, Switzerland
| | - J-H Chu
- Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - H-H Kuo
- Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - I R Fisher
- Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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Mannella N. The magnetic moment enigma in Fe-based high temperature superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:473202. [PMID: 25352180 DOI: 10.1088/0953-8984/26/47/473202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The determination of the most appropriate starting point for the theoretical description of Fe-based materials hosting high-temperature superconductivity remains among the most important unsolved problem in this relatively new field. Most of the work to date has focused on the pnictides, with LaFeAsO, BaFe(2)As(2) and LiFeAs being representative parent compounds of three families known as 1111, 122 and 111, respectively. This topical review examines recent progress in this area, with particular emphasis on the implication of experimental data which have provided evidence for the presence of electron itinerancy and the detection of local spin moments. In light of the results presented, the necessity of a theoretical framework contemplating the presence and the interplay between itinerant electrons and large spin moments is discussed. It is argued that the physics at the heart of the macroscopic properties of pnictides Fe-based high-temperature superconductors appears to be far more complex and interesting than initially predicted.
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Affiliation(s)
- Norman Mannella
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN,USA
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10
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Charnukha A. Optical conductivity of iron-based superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:253203. [PMID: 24899620 DOI: 10.1088/0953-8984/26/25/253203] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The new family of unconventional iron-based superconductors discovered in 2006 immediately relieved their copper-based high-temperature predecessors as the most actively studied superconducting compounds in the world. The experimental and theoretical effort made in order to unravel the mechanism of superconductivity in these materials has been overwhelming. Although our understanding of their microscopic properties has been improving steadily, the pairing mechanism giving rise to superconducting transition temperatures up to 55 K remains elusive. And yet the hope is strong that these materials, which possess a drastically different electronic structure but similarly high transition temperatures compared to the copper-based compounds, will shed essential new light onto the several-decade-old problem of unconventional superconductivity. In this work we review the current understanding of the itinerant-charge-carrier dynamics in the iron-based superconductors and parent compounds largely based on the optical conductivity data the community has gleaned over the past seven years using such experimental techniques as reflectivity, ellipsometry, and terahertz transmission measurements and analyze the implications of these studies for the microscopic properties of the iron-based materials as well as the mechanism of superconductivity therein.
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11
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Moon SJ, Schafgans AA, Tanatar MA, Prozorov R, Thaler A, Canfield PC, Sefat AS, Mandrus D, Basov DN. Interlayer coherence and superconducting condensate in the c-axis response of optimally doped Ba(Fe(1-x)Co(x))2As2 high-T(c) superconductor using infrared spectroscopy. PHYSICAL REVIEW LETTERS 2013; 110:097003. [PMID: 23496739 DOI: 10.1103/physrevlett.110.097003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2012] [Indexed: 06/01/2023]
Abstract
We report on the infrared studies of the interlayer charge dynamics of a prototypical pnictide superconductor Ba(Fe(0.926)Co(0.074))(2)As(2). We succeeded in probing the intrinsic interlayer response by performing infrared experiments on the crystals with a cleaved ac surface. Our experiments identify the coexistence of the suppression of the electronic spectral weight and the development of a coherent Drude-like response in the normal state. The formation of the interlayer condensate is clearly observed in the superconducting state and appears to be linked to coherent contribution to the normal-state conductivity.
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Affiliation(s)
- S J Moon
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
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12
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Abstract
Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb2PdSi3. In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low- and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.
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13
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Moon SJ, Schafgans AA, Kasahara S, Shibauchi T, Terashima T, Matsuda Y, Tanatar MA, Prozorov R, Thaler A, Canfield PC, Sefat AS, Mandrus D, Basov DN. Infrared measurement of the pseudogap of P-doped and Co-doped high-temperature BaFe2As2 superconductors. PHYSICAL REVIEW LETTERS 2012; 109:027006. [PMID: 23030200 DOI: 10.1103/physrevlett.109.027006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Indexed: 06/01/2023]
Abstract
We report on infrared studies of charge dynamics in a prototypical pnictide system: the BaFe2As2 family. Our experiments have identified hallmarks of the pseudogap state in the BaFe2As2 system that mirror the spectroscopic manifestations of the pseudogap in the cuprates. The magnitude of the infrared pseudogap is in accord with that of the spin-density-wave gap of the parent compound. By monitoring the superconducting gap of both P- and Co-doped compounds, we find that the infrared pseudogap is unrelated to superconductivity. The appearance of the pseudogap is found to correlate with the evolution of the antiferromagnetic fluctuations associated with the spin-density-wave instability. The strong-coupling analysis of infrared data further reveals the interdependence between the magnetism and the pseudogap in the iron pnictides.
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Affiliation(s)
- S J Moon
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
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14
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Zhang C, Wang M, Luo H, Wang M, Liu M, Zhao J, Abernathy DL, Maier TA, Marty K, Lumsden MD, Chi S, Chang S, Rodriguez-Rivera JA, Lynn JW, Xiang T, Hu J, Dai P. Neutron scattering studies of spin excitations in hole-doped Ba(0.67)K(0.33)Fe(2)As(2) superconductor. Sci Rep 2011; 1:115. [PMID: 22355632 PMCID: PMC3239165 DOI: 10.1038/srep00115] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Accepted: 09/15/2011] [Indexed: 12/02/2022] Open
Abstract
We report inelastic neutron scattering experiments on single crystals of superconducting Ba(0.67)K(0.33)Fe(2)As(2) (T(c) = 38 K). In addition to confirming the resonance previously found in powder samples, we find that spin excitations in the normal state form longitudinally elongated ellipses along the Q(AFM) direction in momentum space, consistent with density functional theory predictions. On cooling below T(c), while the resonance preserves its momentum anisotropy as expected, spin excitations at energies below the resonance become essentially isotropic in the in-plane momentum space and dramatically increase their correlation length. These results suggest that the superconducting gap structures in Ba(0.67)Ka(0.33)Fe(2)As(2) are more complicated than those suggested from angle resolved photoemission experiments.
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Affiliation(s)
- Chenglin Zhang
- Department of Physics and Astronomy, The University of
Tennessee, Knoxville, Tennessee 37996-1200,
USA
- These authors contributed equally to this work
| | - Meng Wang
- Department of Physics and Astronomy, The University of
Tennessee, Knoxville, Tennessee 37996-1200,
USA
- Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing
100190, China
- These authors contributed equally to this work
| | - Huiqian Luo
- Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing
100190, China
| | - Miaoyin Wang
- Department of Physics and Astronomy, The University of
Tennessee, Knoxville, Tennessee 37996-1200,
USA
| | - Mengshu Liu
- Department of Physics and Astronomy, The University of
Tennessee, Knoxville, Tennessee 37996-1200,
USA
| | - Jun Zhao
- Department of Physics and Astronomy, The University of
Tennessee, Knoxville, Tennessee 37996-1200,
USA
| | - D. L. Abernathy
- Neutron Scattering Science Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831,
USA
| | - T. A. Maier
- Center for Nanophase Materials Sciences and Computer Science and
Mathematics Division, Oak Ridge National Laboratory, Oak Ridge,
Tennessee 37831, USA
| | - Karol Marty
- Neutron Scattering Science Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831,
USA
| | - M. D. Lumsden
- Neutron Scattering Science Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831,
USA
| | - Songxue Chi
- NIST Center for Neutron Research, National Institute of
Standards and Technology, Gaithersburg, Maryland
20899-6012, USA
- Department of Materials Science and Engineering, University of
Maryland, College Park, Maryland 20899,
USA
| | - Sung Chang
- NIST Center for Neutron Research, National Institute of
Standards and Technology, Gaithersburg, Maryland
20899-6012, USA
| | - Jose A. Rodriguez-Rivera
- NIST Center for Neutron Research, National Institute of
Standards and Technology, Gaithersburg, Maryland
20899-6012, USA
- Department of Materials Science and Engineering, University of
Maryland, College Park, Maryland 20899,
USA
| | - J. W. Lynn
- NIST Center for Neutron Research, National Institute of
Standards and Technology, Gaithersburg, Maryland
20899-6012, USA
| | - Tao Xiang
- Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing
100190, China
- Institue of Theoretical Physics, Chinese Academy of
Sciences, P. O. Box 2735, Beijing 100190,
China
| | - Jiangping Hu
- Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing
100190, China
- Department of Physics, Purdue University, West
Lafayette, Indiana 47907, USA
| | - Pengcheng Dai
- Department of Physics and Astronomy, The University of
Tennessee, Knoxville, Tennessee 37996-1200,
USA
- Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing
100190, China
- Neutron Scattering Science Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831,
USA
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