1
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Gnewuch S, Rodriguez EE. The fourth ferroic order: Current status on ferrotoroidic materials. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2018.12.035] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Flux crystal growth, structure, magnetic and optical properties of a family of alkali uranium(IV) phosphates. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2018.10.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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Köferstein R, Arnold M, Robl C. Crystal Structure and Characterization of Two Layered Copper(II) Coordination Polymers with Anions of 3-Phosphonopropionic Acid and ( RS
)-2-Phosphonobutyric Acid. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201700453] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Roberto Köferstein
- Institute of Chemistry, Inorganic Chemistry; Martin Luther University Halle-Wittenberg; Kurt-Mothes-Strasse 2 06120 Halle Germany
| | - Michael Arnold
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-University Jena; Humboldtstrasse 8 07743 Jena Germany
| | - Christian Robl
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-University Jena; Humboldtstrasse 8 07743 Jena Germany
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Köferstein R, Arnold M, Robl C. Synthesis, Crystal Structure, and Characterization of Two Novel One- and Two-Dimensionally Polymeric Copper(II) Phosphonoacetates. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201600457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Roberto Köferstein
- Institute of Chemistry, Inorganic Chemistry; Martin Luther University Halle-Wittenberg; Kurt-Mothes-Strasse 2 06120 Halle Germany
| | - Michael Arnold
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-University Jena; Humboldtstrasse 8 07743 Jena Germany
| | - Christian Robl
- Institute of Inorganic and Analytical Chemistry; Friedrich-Schiller-University Jena; Humboldtstrasse 8 07743 Jena Germany
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Muthuselvam IP, Sankar R, Singh VN, Rao GN, Lee WL, Guo GY, Chou FC. Magnetic Orderings in Li2Cu(WO4)2 with Tungstate-Bridged Quasi-1D Spin-1/2 Chains. Inorg Chem 2015; 54:4303-9. [PMID: 25864534 DOI: 10.1021/ic503080e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By both experimental measurements and theoretical calculations, we investigated the magnetic and electronic properties of Li2Cu(WO4)2 as a tungstate-bridged quasi-one-dimensional (1D) copper spin-(1/2) chain system. Interestingly, magnetic susceptibility χ(T) and specific heat measurements show that the system undergoes a three-dimensional antiferromagnetic (AF)-like ordering at TN ≈ 3.7 K, below a broad χ(T) maximum at ∼8.9 K indicating a low-dimensional short-range AF spin correlation. Bonner-Fisher model fitting of χ(T) leads to an AF intrachain exchange constant of J/kB = 15.8 ± 0.1 K, and mean-field theory estimation gives an interchain coupling constant of J⊥/kB = 1.6 K, which supports the quasi-1D nature of this spin system. Theoretical evaluation of exchange coupling constants within the generalized gradient approximation (GGA) plus on-site Coulomb interaction (U) shows that the dominant AF exchange interaction is of ∼13.9 K along the a-axis with weak interchain coupling, in agreement with the experimental result of a quasi-1D spin-(1/2) chain system. The GGA+U calculations also predict that Li2Cu(WO4)2 is a charge transfer-type AF semiconductor with a direct band gap of 1.5 eV.
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Affiliation(s)
| | | | - Viveka Nand Singh
- ¶Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
| | | | - Wei-Li Lee
- ‡Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | | | - Fang-Cheng Chou
- ∥National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.,⊥Ministry of Science and Technology, Taiwan Consortium of Emergent Crystalline Materials, Taipei 10622, Taiwan
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6
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Koo HJ, Whangbo MH. Spin Exchange and Magnetic Dipole–Dipole Interactions Leading to the Magnetic Superstructures of MAs2O6 (M = Mn, Co, Ni). Inorg Chem 2014; 53:3812-7. [DOI: 10.1021/ic500156e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hyun-Joo Koo
- Department of Chemistry and Research Institute
for Basic Science, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Myung-Hwan Whangbo
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
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Kanetomo T, Ishida T. Preparation and characterization of [Gd(hfac)3(DTBN)(H2O)] (DTBN = di-t-butyl nitroxide). Ferromagnetic Gd3+–Gd3+ super–superexchange. Chem Commun (Camb) 2014; 50:2529-31. [DOI: 10.1039/c3cc48326f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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El Hafid H, Velázquez M, Pérez O, El Jazouli A, Pautrat A, Decourt R, Veber P, Viraphong O, Delmas C. Crystal Growth and Structure of the New Ferrimagnetic Oxyphosphate PbFe
3
O(PO
4
)
3. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100815] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hassan El Hafid
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac cedex, France
| | - Matias Velázquez
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac cedex, France
| | - Olivier Pérez
- Laboratoire de Cristallographie et Sciences des Matériaux, UMR 6508 CNRS/Université de Caen, 6 Boulevard du Maréchal Juin, 14050 Caen cedex 04, France
| | - Abdelaziz El Jazouli
- Laboratoire de Chimie des Matériaux Solides, URAC 17,Université Hassan II Mohammedia, Faculté des Sciences Ben M'Sik, Casablanca, Morocco, Fax: +33‐5‐40‐00‐27‐61
| | - Alain Pautrat
- Laboratoire de Cristallographie et Sciences des Matériaux, UMR 6508 CNRS/Université de Caen, 6 Boulevard du Maréchal Juin, 14050 Caen cedex 04, France
| | - Rodolphe Decourt
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac cedex, France
| | - Philippe Veber
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac cedex, France
| | - Oudomsack Viraphong
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac cedex, France
| | - Claude Delmas
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac cedex, France
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9
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Koo HJ. Analysis of Spin Exchange Interactions in (C 2N 2H 10)[Fe(HPO 3)F 3] on the Basis of Electronic Structure Calculations. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.2.467] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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Amuneke NE, Gheorghe DE, Lorenz B, Möller A. Synthesis, Crystal Structure, and Physical Properties of BaAg2Cu[VO4]2: A New Member of the S = 1/2 Triangular Lattice. Inorg Chem 2011; 50:2207-14. [DOI: 10.1021/ic1018554] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ngozi E. Amuneke
- Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003, United States
- Texas Center for Superconductivity, University of Houston, 2002 Houston Science Centre, Houston, Texas 77204-5002, United States
| | - Dana E. Gheorghe
- Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003, United States
- Texas Center for Superconductivity, University of Houston, 2002 Houston Science Centre, Houston, Texas 77204-5002, United States
| | - Bernd Lorenz
- Texas Center for Superconductivity, University of Houston, 2002 Houston Science Centre, Houston, Texas 77204-5002, United States
- Department of Physics, University of Houston, 617 Science & Research Building 1, Houston, Texas 77204-5005, United States
| | - Angela Möller
- Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003, United States
- Texas Center for Superconductivity, University of Houston, 2002 Houston Science Centre, Houston, Texas 77204-5002, United States
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11
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Koo HJ, Whangbo MH. Finite Magnetization Plateau from a Two-Dimensional Antiferromagnet: Density Functional Analysis of the Magnetic Structure of Cu3(P2O6OH)2. Inorg Chem 2010; 49:9253-6. [DOI: 10.1021/ic100906s] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyun-Joo Koo
- Department of Chemistry and Research Institute of Basic Science, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Myung-Hwan Whangbo
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695
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12
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Kim DH, Koo HJ. Determination of Strongly Interacting Spin Exchange Path and Spin Lattice Model of (VO) 2(H 2O){O 3P-(CH 2) 3-PO 3}ㆍ2H 2O on the Basis of Spin Dimer Analysis. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.6.1665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Super–superexchange coupling through a hydrogen bond in a linear copper(II) complex, [Cu(LH)(L)]·BF4·2H2O (LH =N-tert-butyl-N-2-pyridylhydroxylamine). Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.08.066] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Salunke S, Singh VR, Mahajan AV, Dasgupta I. Electronic structure of Na(2)CuP(2)O(7): a nearly 2D Heisenberg antiferromagnetic system. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:025603. [PMID: 21813988 DOI: 10.1088/0953-8984/21/2/025603] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have employed first principles calculations to study the electronic structure and the implications for the magnetic properties of Na(2)CuP(2)O(7). Using the self-consistent tight-binding linearized muffin-tin orbital method and the Nth-order muffin-tin orbital downfolding method, we have calculated the various intrachain and interchain hopping parameters between the magnetic Cu(2+) ions. Our calculations for Na(2)CuP(2)O(7) reveal dominant intrachain hopping, but in contrast to the typical quantum spin chains the interchain hoppings are not negligible. The Wannier function plot of the Cu d(x(2)-y(2)) orbitals shows that the exchange interactions are primarily mediated by the oxygens and the distance between the oxygens in Na(2)CuP(2)O(7) is favorable for both intrachain and interchain interactions, suggesting the inapplicability of the one-dimensional Heisenberg model for this system, in agreement with recent experimental results.
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Affiliation(s)
- S Salunke
- Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India
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15
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Koo HJ, Whangbo MH. Determination of the Spin−Lattice Relevant for the Quaternary Magnetic Oxide Bi4Cu3V2O14 on the Basis of Tight-Binding and Density Functional Calculations. Inorg Chem 2008; 47:4779-84. [DOI: 10.1021/ic800216j] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyun-Joo Koo
- Department of Chemistry and Research Institute of Basic Science, Kyung Hee University, Seoul 130-701, Korea, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
| | - Myung-Hwan Whangbo
- Department of Chemistry and Research Institute of Basic Science, Kyung Hee University, Seoul 130-701, Korea, and Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204
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16
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Koo HJ, Whangbo MH. On the correct spin lattice for the spin-gapped magnetic solid NH4CuPO4·H2O. J SOLID STATE CHEM 2008. [DOI: 10.1016/j.jssc.2007.11.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Determination of Strongly Interacting Spin Exchange Paths in Cu2(O3PCH2PO3) on the Basis of Spin Dimer Analysis. B KOREAN CHEM SOC 2008. [DOI: 10.5012/bkcs.2008.29.1.122] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Belik AA, Koo HJ, Whangbo MH, Tsujii N, Naumov P, Takayama-Muromachi E. Magnetic Properties of Synthetic Libethenite Cu2PO4OH: a New Spin-Gap System. Inorg Chem 2007; 46:8684-9. [PMID: 17850074 DOI: 10.1021/ic7008418] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Synthetic mineral libethenite Cu(2)PO(4)OH was prepared by the hydrothermal method, and its structure at 200 K was refined by single-crystal X-ray diffraction. The structure of Cu(2)PO(4)OH is built up from Cu2(2)O(6)(OH)2 dimers of edge-sharing Cu2O(4)(OH) trigonal bipyramids and [Cu1(2)O(6)(OH)(2)] proportional chains of edge-sharing Cu1O(4)(OH)(2) octahedra. Magnetic properties of Cu(2)PO(4)OH were investigated by magnetic susceptibility, magnetization, and specific heat measurements. Cu(2)PO(4)OH is a spin-gap system with a spin gap of about 139 K. It was shown by spin dimer analysis that, to a first approximation, the magnetic structure of Cu(2)PO(4)OH is described by an isolated square-spin cluster model defined by the Cu1-O-Cu2 superexchange J with Cu1...Cu2 = 3.429 A. The fitting analysis of the magnetic susceptibility data with a square-spin cluster model results in J/k(B) = 138 K. Specific heat data show that Cu(2)PO(4)OH does not undergo a long-range magnetic ordering down to 1.8 K. We also report vibrational properties studied with Raman spectroscopy and the thermal stability of Cu(2)PO(4)OH.
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Affiliation(s)
- Alexei A Belik
- Advanced Nano Materials Laboratory (ANML), International Center for Young Scientists (ICYS), and Quantum Beam Center, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
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Roy LE, Hughbanks T. A tight-binding method for predicting magnetic ordering in Gd-containing solids: Application to GdB2C2. J Phys Chem B 2006; 110:20290-6. [PMID: 17034209 DOI: 10.1021/jp064124v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein we present a method to compute d-f mediated exchange coupling in Gd-containing systems with a spin-dependent extended Hückel-tight binding (EHTB) method. EHTB parameters were chosen to exactly reproduce the spin density functional calculation (SDFT) energy gap of the S = 45/2 and 39/2 spin patterns for a model compound, Gd6CoI12(OPH3)6. Comparison between SDFT and EHTB results shows a good match between the spin-pattern energy distribution for the two methods. We applied our EHTB method to the solid-state compound GdB2C2 by considering 6 different variations in the ordering of the 4f7 moments. Calculations indicate that this metallic system should exhibit antiferromagnetic ordering of the 4f7 moments with a magnetic structure consistent with published neutron diffraction results.
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Affiliation(s)
- Lindsay E Roy
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA
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20
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Ben Yahia H, Gaudin E, Darriet J, Dai D, Whangbo MH. Comparison of the crystal structures and magnetic properties of the low- and high-temperature forms of AgCuPO4: crystal structure determination, magnetic susceptibility measurements, and spin dimer analysis. Inorg Chem 2006; 45:5501-9. [PMID: 16813413 DOI: 10.1021/ic060484l] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The crystal structure of the low-temperature form of AgCuPO4 (i.e., alpha-AgCuPO4) was determined by powder X-ray diffraction and was compared with that of the high-temperature form of AgCuPO4 (i.e., beta-AgCuPO4). The magnetic properties of the two forms were examined by measuring their magnetic susceptibilities and evaluating the relative strengths of their spin-exchange interactions on the basis of spin-dimer analysis. Both forms of AgCuPO4 have layers of Cu2P2O8 alternating with silver-atom double layers; beta-AgCuPO4 has two Cu2P2O8 layers per unit cell, while alpha-AgCuPO4 has one. The coordinate environment of each Cu2+ ion is close to being a distorted square pyramid in alpha-AgCuPO4, but it is close to being a distorted trigonal bipyramid in beta-AgCuPO4. The magnetic susceptibilities of alpha- and beta-AgCuPO4 are well simulated by an antiferromagnetic alternating-chain model, which leads to J/k(B) = -146.1 K and alphaJ/k(B) = -75.8 K for alpha-AgCuPO4, and J/k(B) = -82.6 K and alphaJ/k(B) = -31.7 K for beta-AgCuPO4 (with the convention in which the spin-exchange parameter between two adjacent spin sites is written as 2J). The spin gaps, delta/k(B), obtained from these parameters are 93.7 K for alpha-AgCuPO4 and 62.3 K for beta-AgCuPO4. The strongest spin exchange in both forms of AgCuPO4 comes from a super-superexchange path, and this interaction is stronger for alpha-AgCuPO4 than for beta-AgCuPO4 by a factor of approximately 2, in good agreement with the experiment. Our analysis supports the use of this model for beta-AgCuPO4 and indicates that the spin lattice of alpha-AgCuPO4 would be better described by a two-dimensional net made up of weakly interacting alternating chains.
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Affiliation(s)
- Hamdi Ben Yahia
- Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS), Université de Bordeaux 1, 87 Avenue du Docteur A. Schweitzer, 33608 Pessac Cedex, France
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Koo HJ, Whangbo MH. Importance of the O−M−O Bridges (M = V5+, Mo6+) for the Spin-Exchange Interactions in the Magnetic Oxides of Cu2+ Ions Bridged by MO4 Tetrahedra: Spin-Lattice Models of Rb2Cu2(MoO4)3, BaCu2V2O8, and KBa3Ca4Cu3V7O28. Inorg Chem 2006; 45:4440-7. [PMID: 16711694 DOI: 10.1021/ic060392w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The spin-lattice models relevant for the magnetic oxides Rb2Cu2(MoO4)3, BaCu2V2O8, and KBa3Ca4Cu3V7O28 were determined by evaluating the relative strengths of the spin-exchange interactions between their Cu2+ ions on the basis of spin dimer analysis. Our study shows that the O-M-O bridges (M = V5+, Mo6+) between the magnetic ions Cu2+, provided by the MO4 tetrahedra, are crucial for the spin-exchange interactions and hence for deducing the spin-lattice models needed to interpret the magnetic properties of these oxides. The spin-lattice model of Rb2Cu2(MoO4)3 is not a uniform chain but two interpenetrating spin ladders that interact weakly with geometric spin frustration. The spin-lattice model of BaCu2V2O8 is an alternating chain as expected, but the spin-exchange paths responsible for it differ from those expected. With respect to the strongest spin exchange of BaCu2V2O8, the spin exchange of KBa3Ca4Cu3V7O28 is only slightly weaker, but the strongest spin exchange of Rb2Cu2(MoO4)3 is much weaker. This difference in the spin-exchange strengths is caused by the difference in the bridging modes of the MO4 tetrahedra leading to these spin-exchange interactions.
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Affiliation(s)
- Hyun-Joo Koo
- Department of Chemistry and Research Institute of Basic Science, Kyung Hee University, Seoul 130-701, South Korea.
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Long-range magnetic ordering of quasi-one-dimensional S=1/2 Heisenberg antiferromagnet Sr2Cu(PO4)2. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.08.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Belik AA, Azuma M, Matsuo A, Whangbo MH, Koo HJ, Kikuchi J, Kaji T, Okubo S, Ohta H, Kindo K, Takano M. Investigation of the Crystal Structure and the Structural and Magnetic Properties of SrCu2(PO4)2. Inorg Chem 2005; 44:6632-40. [PMID: 16156620 DOI: 10.1021/ic051079h] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
SrCu2(PO4)2 was prepared by the solid-state method at 1153 K. Its structure was solved by direct methods in the space group Pccn (No. 56) with Z = 8 from synchrotron X-ray powder diffraction data measured at room temperature. Structure parameters were then refined by the Rietveld method to obtain the lattice parameters, a = 7.94217(8) A, b = 15.36918(14) A, and c = 10.37036(10) A. SrCu2(PO4)2 presents a new structure type and is built up from Sr2O16 and Cu1Cu2O8 units with Cu1...Cu2 = 3.256 A. The magnetic properties of SrCu2(PO4)2 were investigated by magnetic susceptibility, magnetization up to 65 T, Cu nuclear quadrupole resonance (NQR), electron-spin resonance, and specific heat measurements. With spin-dimer analysis, it was shown that the two strongest spin-exchange interactions between Cu sites result from the Cu1-O...O-Cu2 and Cu2-O...O-Cu2 super-superexchange paths with Cu1...Cu2 = 5.861 A and Cu2...Cu2 = 5.251 A, and the superexchange associated with the structural dimer Cu1Cu2O8 is negligible. The magnetic susceptibility data were analyzed in terms of a linear four-spin cluster model, Cu1-Cu2-Cu2-Cu1 with -2J(1)/kB = 82.4 K for Cu1-Cu2 and -2J(2)/k(B) = 59 K for Cu2-Cu2. A spin gap deduced from this model (Delta/kB = 63 K) is in agreement with that obtained from the Cu NQR data (Delta/kB = 65 K). A one-half magnetization plateau was observed between approximately 50 and 63 T at 1.3 K. Specific heat data show that SrCu2(PO4)2 does not undergo a long-range magnetic ordering down to 0.45 K. SrCu2(PO4)2 melts incongruently at 1189 K. We also report its vibrational properties studied with Raman spectroscopy.
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Affiliation(s)
- Alexei A Belik
- International Center for Young Scientists, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan.
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