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Bhattacharjee S, Chaudhury R. Study of effective coupling between charge degrees of freedom in low dimensional hole-doped quantum antiferromagnets. CANADIAN JOURNAL OF PHYSICS 2021; 99:159-167. [DOI: 10.1139/cjp-2020-0306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
Abstract
Expressions for the generalized charge stiffness constant at zero temperature are derived corresponding to low-dimensional hole-doped quantum antiferromagnets, describable by the t–J-like models, with a view to understanding fermionic pairing possibilities and charge couplings in itinerant antiferromagnetic systems. A detailed comparison between spin and charge correlations and couplings are presented for the strong and weak coupling limits in one (1D) and two (2D) dimensions. The result highlights that the charge and spin couplings show very similar behaviour in the over-doped region in both dimensions, whereas they show a completely different trend in the lower doping regimes. A qualitative equivalence of the generalized charge stiffness constant with the effective Drude weight and Coulomb interaction is established based on the comparison with other theoretical and experimental results. The fall in charge stiffness with increase in doping then implies a reduction in magnitude of the effective Coulomb repulsion between the mobile carriers. This leads to an enhanced possibility of fermionic pairing with an increase in doping concentration, in the possible presence of some other attraction-producing mechanism from a source outside the t–J-like models. Moreover, under certain conditions in the optimal doping region, the t–J-like models themselves are able to produce an attractive interaction for pairing.
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Affiliation(s)
- Suraka Bhattacharjee
- Department of Condensed Matter Physics and Material Sciences, S.N. Bose National Centre for Basic Sciences, Saltlake, Sector-III, Block-JD, Kolkata 700106, India
| | - Ranjan Chaudhury
- Department of Condensed Matter Physics and Material Sciences, S.N. Bose National Centre for Basic Sciences, Saltlake, Sector-III, Block-JD, Kolkata 700106, India
- Department of Physics, Ramakrishna Mission Vivekananda Educational and Research Institute, P.O. Belur Math, Howrah 711202, West Bengal, India
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Klein RA, Walsh JPS, Clarke SM, Guo Y, Bi W, Fabbris G, Meng Y, Haskel D, Alp EE, Van Duyne RP, Jacobsen SD, Freedman DE. Impact of Pressure on Magnetic Order in Jarosite. J Am Chem Soc 2018; 140:12001-12009. [PMID: 30063832 DOI: 10.1021/jacs.8b05601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Jarosite, a mineral with a kagomé lattice, displays magnetic frustration yet orders magnetically below 65 K. As magnetic frustration can engender exotic physical properties, understanding the complex magnetism of jarosite comprises a multidecade interdisciplinary challenge. Unraveling the nature of the disparate magnetic coupling interactions that lead to magnetic order in jarosite remains an open question. Specifically, there is no observed trend in the interlayer spacing with magnetic order. Similarly, the relationship between metal-ligand bond distance and magnetic order remains uninvestigated. Here, we use applied pressure to smoothly vary jarosite's structure without manipulating the chemical composition, enabling a chemically invariant structure-function study. Using single-crystal and powder X-ray diffraction, we show that high applied pressures alter both the interlayer spacing and the metal-ligand bond distances. By harnessing a suite of magnetic techniques under pressure, including SQUID-based magnetometry, time-resolved synchrotron Mössbauer spectroscopy, and X-ray magnetic circular dichroism, we construct the magnetic phase diagram for jarosite up to 40 GPa. Notably, we demonstrate that the magnetic ordering temperature increases dramatically to 240 K at the highest pressures. Additionally, we conduct X-ray emission spectroscopy, Mössbauer spectroscopy, and UV-visible absorption spectroscopy experiments to comprehensively map the magnetic and electronic structures of jarosite at high pressure. We use these maps to construct chemically pure magnetostructural correlations which fully explain the nature and role of the disparate magnetic coupling interactions in jarosite.
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Affiliation(s)
- Ryan A Klein
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - James P S Walsh
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Samantha M Clarke
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Yinsheng Guo
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Wenli Bi
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States.,Department of Geology , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Gilberto Fabbris
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - Yue Meng
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States.,HPCAT, Geophysical Laboratory , Carnegie Institute of Washington , Argonne , Illinois 60439 , United States
| | - Daniel Haskel
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - E Ercan Alp
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - Richard P Van Duyne
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
| | - Steven D Jacobsen
- Department of Earth and Planetary Sciences , Northwestern University , Evanston , Illinois 60208 , United States
| | - Danna E Freedman
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
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Deng HY. Spin glass behaviors compatible with a Zhang-Rice singlet within an effective model for cuprate superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:075702. [PMID: 21817335 DOI: 10.1088/0953-8984/21/7/075702] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
To address the incompatibility of Zhang-Rice singlet formation and the observed spin glass behavior, an effective model is proposed for the electronic behavior of cuprate materials. The model includes an antiferromagnetic interaction between the spin of the hole in a Zhang-Rice orbital and the spin of the hole on the corresponding copper site. While in the large interaction limit this recovers the t-J model, in the low energy limit the Zhang-Rice singlets are deformed. It is also shown that such deformation can induce random defect ferromagnetic (FM) bonds between adjacent local spins, an effect herein referred to as unusual double exchange, and then spin glass behavior shall result in the case of localized holes. A derivation of the model is also presented.
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Affiliation(s)
- Hai-Yao Deng
- Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong
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Brookes NB, Ghiringhelli G, Tjernberg O, Tjeng LH, Mizokawa T, Li TW, Menovsky AA. Detection of Zhang-Rice singlets using spin-polarized photoemission. PHYSICAL REVIEW LETTERS 2001; 87:237003. [PMID: 11736472 DOI: 10.1103/physrevlett.87.237003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2000] [Indexed: 05/23/2023]
Abstract
From a spin-resolved photoemission study on the Bi(2)Sr(2)CaCu(2)O(8+delta) superconductor, we show experimentally that the first ionization state is of nearly pure singlet character. This is true both above and below the superconducting transition and in the presence of doping and band formation. This provides direct support for the existence and stability of Zhang-Rice singlets in high-temperature superconductors, justifying the ansatz of single-band models. Moreover, we establish this technique as an important probe for a wide range of cuprates and strongly correlated materials.
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Affiliation(s)
- N B Brookes
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
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Abstract
The high
T
c
superconductors have one structural element in common, namely CuO
2
planes which are lightly doped away from an average valence of Cu
2+
. In the absence of this doping the planes are in a Mott insulating state with local S = 1/2 moments on each Cu-site. There is considerable evidence both experimental and theoretical supporting the assignment of the extra holes, introduced by doping, to the antibonding O 2p-orbitals. The strong hybridization between these orbitals and the central Cu 3d-orbitals makes it favourable to bind the extra hole with a Cu
2+
local moment to form a spin singlet state centred on a CuO
4
square. This singlet, however, is mobile and the combination of mobile charged singlets and local spins is described by the so-called
t-J
model. This has a number of consequences which can be tested experimentally. For example, one can use this model to estimate the hyperfine coupling constants which are measured in NMR experiments. The prediction that the only spin degrees of freedom are the local Cu
2+
spins even upon doping can also be tested in NMR experiments.
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