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Mandujano HC, Gonzalez SL, Episcopo N, Sitharaman U, Poudel N, Gofryk K, Garay YE, Lopez JA, Zhang Q, Calder S, Nair HS. Absence of long-range magnetic order in lithium-containing honeycombs in the Li-Cr-Sb(Te)-O phases. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:295802. [PMID: 33971639 DOI: 10.1088/1361-648x/abff90] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 05/10/2021] [Indexed: 06/12/2023]
Abstract
Li3((LiCr)(Te/Sb))O6compounds where Cr atoms along with Li and Te or Sb are part of a honeycomb and are studied using magnetic susceptibility, specific heat, x-ray photoelectron spectroscopy and neutron diffraction. The oxides stoichiometries as determined from the neutron diffraction studies are Li4.47Cr0.53TeO6and Li3.88Cr1.12SbO6with a stable oxidation state of +3 for Cr. Both the compounds crystallize in space groupC2/mwith intermixing of cations at the 4gsites leaving the 2asites preferentially for Te or Sb. Again, the Li+ions alone predominantly occur in the interlayer sites. Both the compounds show a broad anomaly in specific heat at 8 K, which is robust against 8 T. A corresponding anomaly is absent in the magnetic susceptibility but recovers from its derivative, dχ(T)/dT. We ascertain the magnetic anomaly temperatures (Ta) of Li4.47Cr0.53TeO6and Li3.88Cr1.12SbO6as 5.9 K and 6.7 K respectively from specific heat. Although the physical properties indicated a low temperature anomaly, neutron diffraction data did not reveal a magnetic signal or a structural anomaly down to 1.5 K. This rules out a conventional long-range ordered magnetic ground state in either compounds. Combining the results from specific heat, neutron diffraction and electron paramagnetic resonance, we put forth a scenario of depleted honeycomb lattice of Cr3+with predominant short-range magnetic correlations as the magnetic ground states of the title compounds.
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Affiliation(s)
- H Cein Mandujano
- Department of Physics, 500 W University Ave, University of Texas at El Paso, El Paso, TX 79968, United States of America
| | - Sandra L Gonzalez
- Department of Physics, 500 W University Ave, University of Texas at El Paso, El Paso, TX 79968, United States of America
| | - Nathan Episcopo
- Department of Physics, 500 W University Ave, University of Texas at El Paso, El Paso, TX 79968, United States of America
| | - Uma Sitharaman
- Department of Chemistry, University of Delhi, Delhi-110007, India
| | - Narayan Poudel
- Idaho National Laboratory, Idaho Falls, ID 83415, United States of America
| | - Krzysztof Gofryk
- Idaho National Laboratory, Idaho Falls, ID 83415, United States of America
| | - Yahir E Garay
- Department of Physics, 500 W University Ave, University of Texas at El Paso, El Paso, TX 79968, United States of America
| | - Jorge A Lopez
- Department of Physics, 500 W University Ave, University of Texas at El Paso, El Paso, TX 79968, United States of America
| | - Qiang Zhang
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States of America
| | - Stuart Calder
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States of America
| | - Harikrishnan S Nair
- Department of Physics, 500 W University Ave, University of Texas at El Paso, El Paso, TX 79968, United States of America
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Wilfong B, Zhou X, Zheng H, Babra N, Brown CM, Lynn JW, Taddei KM, Paglione J, Rodriguez EE. Long-range magnetic order in hydroxide-layer-doped (Li 1-x-y Fe x Mn y OD)FeSe. PHYSICAL REVIEW MATERIALS 2020; 4:10.1103/PhysRevMaterials.4.034803. [PMID: 34142003 PMCID: PMC8207456 DOI: 10.1103/physrevmaterials.4.034803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The (Li1-x Fe x OH)FeSe superconductor has been suspected of exhibiting long-range magnetic ordering due to Fe substitution in the LiOH layer. However, no direct observation such as magnetic reflection from neutron diffraction has been reported. Here, we use a chemical design strategy to manipulate the doping level of transition metals in the LiOH layer to tune the magnetic properties of the (Li1-x-y Fe x Mn y OD)FeSe system. We find Mn doping exclusively replaces Li in the hydroxide layer resulting in enhanced magnetization in the (Li0.876Fe0.062Mn0.062OD)FeSe superconductor without significantly altering the superconducting behavior as resolved by magnetic susceptibility and electrical/thermal transport measurements. As a result, long-range magnetic ordering was observed below 12 K with neutron diffraction measurements. This work has implications for the design of magnetic superconductors for the fundamental understanding of superconductivity and magnetism in the iron chalcogenide system as well as exploitation as functional materials for next-generation devices.
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Affiliation(s)
- Brandon Wilfong
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
- Maryland Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA
| | - Xiuquan Zhou
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Huafei Zheng
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Navneeth Babra
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Craig M. Brown
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Jeffrey W. Lynn
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Keith M. Taddei
- Diffraction Group, Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Johnpierre Paglione
- Maryland Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA
- Department of Physics, University of Maryland, College Park, Maryland 20742, USA
| | - Efrain E. Rodriguez
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
- Maryland Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA
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Marik S, Dos Santos-Garcia AJ, Morán E, Toulemonde O, Alario-Franco MA. Spin glass to superconducting phase transformation by oxidation of a molybdo-cuprate: Mo0.3Cu0.7Sr2TmCu2Oy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:165704. [PMID: 23551981 DOI: 10.1088/0953-8984/25/16/165704] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A detailed study of the structure and properties for the as-prepared and oxygen annealed Mo0.3Cu0.7Sr2TmCu2Oy material is reported. The Cu/Mo cationic distribution is established using a combination of x-ray/neutron powder diffraction refinement. The chemical substitution of the Mo ions for the Cu ions in the CuYSr2Cu2O(7-δ) structure is found to occur in both of the copper sites for the as-prepared sample. Interestingly, no trace of Mo substitution in the copper plane site is found to occur after oxygenation. The as-prepared Mo0.3Cu0.7Sr2TmCu2Oy material is found to be a spin glass (SG) system and explained on the basis of the cluster-by-cluster freezing model. On the other hand, the oxygen annealed material is superconducting (SC) (T(SC,onset) = 31 K). A peak has been observed in the critical current density plot and can be explained on the basis of field induced pins. The influence of oxygen annealing in the structure and properties of this material are presented and discussed. This seems to be the first case of a SG-SC transformation following an oxidation reaction in cuprates.
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Affiliation(s)
- Sourav Marik
- Departamento de Química Inorgánica, Facultad de CC Químicas, U Complutense de Madrid, Madrid, Spain.
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Bera AK, Yusuf SM, Mirebeau I. Effect of electron doping on the magnetic correlations in the bilayered brownmillerite compound Ca(2.5-x)La(x)Sr(0.5)GaMn2O8: a neutron diffraction study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:426005. [PMID: 21983174 DOI: 10.1088/0953-8984/23/42/426005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The effect of electron doping on the magnetic properties of the brownmillerite type bilayered compounds has been investigated by neutron powder diffraction in La substituted Ca(2.5-x)La(x)Sr(0.5)GaMn(2)O(8) compounds (x = 0.05 and 0.1), in comparison with the undoped compound (x = 0). In all compounds, a long-range three-dimensional collinear antiferromagnetic (AFM) structure is found below the Néel temperature T(N) of the respective compound, whereas, well above T(N), three-dimensional short-range magnetic ordering is observed. In the intermediate temperature range just above T(N), a strong effect of electron doping (La substitution) on the magnetic correlations has been observed. Here, a short-range AFM correlation with a possible dimensionality of three has been found for substituted compounds (x = 0.05 and 0.1) as compared to the reported two-dimensional long-range AFM ordering in the parent compound. With increasing electron doping, a decrease in T(N) is also observed. The short-range magnetic correlations set in over a large temperature range above T(N). A magnetic phase diagram in the x-T plane is proposed from these results.
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Affiliation(s)
- A K Bera
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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Taroni A, Bramwell ST, Holdsworth PCW. Universal window for two-dimensional critical exponents. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:275233. [PMID: 21694394 DOI: 10.1088/0953-8984/20/27/275233] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Two-dimensional condensed matter is realized in increasingly diverse forms that are accessible to experiment and of potential technological value. The properties of these systems are influenced by many length scales and reflect both generic physics and chemical detail. To unify their physical description is therefore a complex and important challenge. Here we investigate the distribution of experimentally estimated critical exponents, β, that characterize the evolution of the order parameter through the ordering transition. The distribution is found to be bimodal and bounded within a window ∼0.1≤β≤0.25, facts that are only in partial agreement with the established theory of critical phenomena. In particular, the bounded nature of the distribution is impossible to reconcile with the existing theory for one of the major universality classes of two-dimensional behaviour-the XY model with four-fold crystal field-which predicts a spectrum of non-universal exponents bounded only from below. Through a combination of numerical and renormalization group arguments we resolve the contradiction between theory and experiment and demonstrate how the 'universal window' for critical exponents observed in experiment arises from a competition between marginal operators.
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Affiliation(s)
- A Taroni
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
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Ott F. Neutron studies of magnetic oxide thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:264009. [PMID: 21694343 DOI: 10.1088/0953-8984/20/26/264009] [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 describe the use of neutron scattering techniques such as reflectivity and diffraction for the study of oxide thin films. We first describe how neutron reflectivity can complement x-ray reflectivity for the study of some oxide materials. We then emphasize magnetic thin films which have become an important field of study in the 1990s, following the discovery of new phenomena in heterostructures: magnetic exchange coupling, exchange bias coupling at antiferro/ferromagnetic interfaces, enhanced magnetism in ultrathin films or tunnel magnetoresistance for example. We show how neutron scattering can provide detailed quantitative information about the magnetization depth profiles of thin films and about the magnetic order in epitaxial films.
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Affiliation(s)
- Frédéric Ott
- Laboratoire Léon Brillouin CEA/CNRS UMR 12, Centre d'Etudes de Saclay, 91191 Gif sur Yvette, Cedex, France
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LaBella VP, Bullock DW, Anser M, Ding Z, Emery C, Bellaiche L, Thibado PM. Microscopic view of a two-dimensional lattice-Gas ising system within the grand canonical ensemble. PHYSICAL REVIEW LETTERS 2000; 84:4152-4155. [PMID: 10990633 DOI: 10.1103/physrevlett.84.4152] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/1999] [Indexed: 05/23/2023]
Abstract
A reversible 2D critical transition is observed on the GaAs(001) surface and modeled as a lattice-gas Ising system. Without depositing any material, 2D GaAs islands spontaneously form. The order parameter, four critical exponents, and coupling energies are measured from scanning tunneling microscope images of the microscopic domain structure and correlation functions as a function of temperature and pressure. Unprecedented insight into the domain structure of a 2D Ising system through the critical point and a complete Hamiltonian for modeling the GaAs(001) surface are presented.
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Affiliation(s)
- VP LaBella
- Department of Physics, The University of Arkansas, Fayetteville, Arkansas 72701, USA
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Wu SY, Li W, Lee KC, Lynn JW, Meen TH, Yang HD. Two- and three-dimensional magnetic correlations of Tb in Pb2Sr2TbCu3O8. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:10019-10026. [PMID: 9984739 DOI: 10.1103/physrevb.54.10019] [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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9
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Longmore A, Boothroyd AT, Changkang C, Yongle H, Nutley MP, Andersen NH, Casalta H, Schleger P, Christensen AN. Magnetic ordering in PrBa2Cu3-yAlyO6+x. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:9382-9395. [PMID: 9982442 DOI: 10.1103/physrevb.53.9382] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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10
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Clinton TW, Lynn JW, Liu JZ, Jia YX, Goodwin TJ, Shelton RN, Lee BW, Buchgeister M, Maple MB, Peng JL. Effects of oxygen on the magnetic order of the rare-earth ions in RBa2Cu3O6+x (R=Dy, Er, Nd). PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:15429-15447. [PMID: 9978503 DOI: 10.1103/physrevb.51.15429] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Staub U, Mesot J, Guillaume M, Allenspach P, Furrer A, Mutka H, Bowden Z, Taylor A. Neutron spectroscopic studies of the crystal field in HoBa2Cu3Ox (6 <= x <= 7). PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:4068-4074. [PMID: 9976687 DOI: 10.1103/physrevb.50.4068] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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12
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Hsieh WT, Chang KJ, Li WH, Lee KC, Lynn JW, Lai CC, Ku HC. Magnetic ordering of Pr and Cu in TlBa2PrCu2O7-y. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:12200-12205. [PMID: 10010095 DOI: 10.1103/physrevb.49.12200] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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13
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Li WH, Chang KJ, Hsieh WT, Lee KC, Lynn JW, Yang HD. Magnetic ordering of Pr in PrBa2Cu2.7Zn0.3O7-y. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:519-523. [PMID: 10006802 DOI: 10.1103/physrevb.48.519] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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14
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Mesot J, Allenspach P, Staub U, Furrer A, Mutka H, Osborn R, Taylor A. Neutron-spectroscopic studies of the crystal field in ErBa2Cu3Ox (6 <= x <= 7). PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:6027-6036. [PMID: 10004550 DOI: 10.1103/physrevb.47.6027] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Misra SK, Felsteiner J. Low-temperature ordered states of RBa2Cu3O7- delta (R=rare earth) due to dipole-dipole and exchange interactions. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:11033-11039. [PMID: 10002967 DOI: 10.1103/physrevb.46.11033] [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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16
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MacIsaac AB, Whitehead JP, De'Bell K, Narayanan KS. Monte Carlo study of two-dimensional Ising dipolar antiferromagnets as a model for rare-earth ordering in the R-Ba-Cu-O compounds (R=rare earth). PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:6387-6394. [PMID: 10002325 DOI: 10.1103/physrevb.46.6387] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zhang H, Lynn JW, Morris DE. Coupled-bilayer two-dimensional magnetic order of the Dy ions in Dy2Ba4Cu7O15. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10022-10031. [PMID: 10000891 DOI: 10.1103/physrevb.45.10022] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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18
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Soderholm L, Loong C, Kern S. Inelastic-neutron-scattering study of the Er3+ energy levels in ErBa2Cu3O7. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10062-10070. [PMID: 10000895 DOI: 10.1103/physrevb.45.10062] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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19
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Chattopadhyay T, Brown PJ, Stepanov AA, Wyder P, Voiron J, Zvyagin AI, Barilo SN, Zhigunov DI, Zobkalo I. Magnetic phase transitions in Gd2CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:9486-9491. [PMID: 9998931 DOI: 10.1103/physrevb.44.9486] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Garca-Muoz JL, Rodrguez-Carvajal J, Obradors X, Vallet-Reg M, González-Calbet J, Parras M. Complex magnetic structures of the rare-earth cuprates R2Cu2O5 (R=Y,Ho,Er,Yb,Tm). PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:4716-4719. [PMID: 10000140 DOI: 10.1103/physrevb.44.4716] [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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Zhang H, Lynn JW, Li WH, Clinton TW, Morris DE. Two- and three-dimensional magnetic order of the rare-earth ions in RBa2Cu4O8. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:11229-11236. [PMID: 9993543 DOI: 10.1103/physrevb.41.11229] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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