Extremely well isolated two-dimensional spin- 1 2 antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF

Opherden, D.; Nizar, N.; Richardson, K.; Monroe, J. C.; Turnbull, M. M.; Polson, M.; Vela, S.; Blackmore, W. J. A.; Goddard, P. A.; Singleton, J.; Choi, E. S.; Xiao, F.; Williams, R. C.; Lancaster, T.; Pratt, F. L.; Blundell, S. J.; Skourski, Y.; Uhlarz, M.; Ponomaryov, A. N.; Zvyagin, S. A.; Wosnitza, J.; Baenitz, M.; Heinmaa, I.; Stern, R.; Kühne, H.; Landee, C. P.

doi:10.1103/PhysRevB.102.064431

Title: Extremely well isolated two-dimensional spin- $\frac{1}{2}$ antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF

Abstract

We report on a comprehensive characterization of the newly synthesized ${Cu}^{2 +}$ -based molecular magnet $[Cu {(pz)}_{2} {(2 - HOpy)}_{2}] {({PF}_{6})}_{2}$ (CuPOF), where $pz = C_{4} H_{4} N_{2}$ and $2 - HOpy = C_{5} H_{4} NHO$ . From a comparison of theoretical modeling to results of bulk magnetometry, specific heat, $μ^{+} SR$ , ESR, and NMR spectroscopy, this material is determined as an excellent realization of the two dimensional square-lattice $S = \frac{1}{2}$ antiferromagnetic Heisenberg model with a moderate intraplane nearest-neighbor exchange coupling of $J / k_{B} = 6.80 (5)$ K, and an extremely small interlayer interaction of about 1 mK. At zero field, the bulk magnetometry reveals a temperature-driven crossover of spin correlations from isotropic to $X Y$ type, caused by the presence of a weak intrinsic easy-plane anisotropy. A transition to long-range order, driven by the low-temperature $X Y$ anisotropy under the influence of the interlayer coupling, occurs at $T_{N} = 1.38 (2)$ K, as revealed by $μ^{+} SR$ . In applied magnetic fields, our ${}_{1}H$ -NMR data reveal a strong increase of the magnetic anisotropy, manifested by a pronounced enhancement of the transition temperature to commensurate long-range order at $T_{N} = 2.8$ K and 7 T.

Publication Date:: Fri Aug 28 00:00:00 EDT 2020

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE; National Science Foundation (NSF); European Research Council (ERC); European Regional Development Fund; Estonian Research Council

OSTI Identifier:: 1651239

Alternate Identifier(s):: OSTI ID: 1843174

Report Number(s):: LA-UR-20-23651
Journal ID: ISSN 2469-9950; PRBMDO; 064431

Grant/Contract Number:: 89233218CNA000001; DMR-1157490; DMR-164477; 681260; TK134; PRG4 IUT23-7

Resource Type:: Published Article

Journal Name:: Physical Review B

Additional Journal Information:: Journal Name: Physical Review B Journal Volume: 102 Journal Issue: 6; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High magnetic field science; BKT transition; 2-dimensional systems; antiferromagnets; Mott insulators; DC susceptibility measurements; density functional theory; electron spin resonance; magnetization measurements; muon spin relaxation & rotation; nuclear magnetic resonance; specific heat measurements

Citation Formats


                    Opherden, D., Nizar, N., Richardson, K., Monroe, J. C., Turnbull, M. M., Polson, M., Vela, S., Blackmore, W. J. A., Goddard, P. A., Singleton, J., Choi, E. S., Xiao, F., Williams, R. C., Lancaster, T., Pratt, F. L., Blundell, S. J., Skourski, Y., Uhlarz, M., Ponomaryov, A. N., Zvyagin, S. A., Wosnitza, J., Baenitz, M., Heinmaa, I., Stern, R., Kühne, H., and Landee, C. P. Extremely well isolated two-dimensional spin- 1 2 antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF.  United States: N. p., 2020. 
Web.  doi:10.1103/PhysRevB.102.064431.

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                    Opherden, D., Nizar, N., Richardson, K., Monroe, J. C., Turnbull, M. M., Polson, M., Vela, S., Blackmore, W. J. A., Goddard, P. A., Singleton, J., Choi, E. S., Xiao, F., Williams, R. C., Lancaster, T., Pratt, F. L., Blundell, S. J., Skourski, Y., Uhlarz, M., Ponomaryov, A. N., Zvyagin, S. A., Wosnitza, J., Baenitz, M., Heinmaa, I., Stern, R., Kühne, H., & Landee, C. P. Extremely well isolated two-dimensional spin- 1 2 antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF.  United States.  https://doi.org/10.1103/PhysRevB.102.064431

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                    Opherden, D., Nizar, N., Richardson, K., Monroe, J. C., Turnbull, M. M., Polson, M., Vela, S., Blackmore, W. J. A., Goddard, P. A., Singleton, J., Choi, E. S., Xiao, F., Williams, R. C., Lancaster, T., Pratt, F. L., Blundell, S. J., Skourski, Y., Uhlarz, M., Ponomaryov, A. N., Zvyagin, S. A., Wosnitza, J., Baenitz, M., Heinmaa, I., Stern, R., Kühne, H., and Landee, C. P. Fri .  
"Extremely well isolated two-dimensional spin- 1 2 antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF".  United States.  https://doi.org/10.1103/PhysRevB.102.064431.

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@article{osti_1651239,

  title        = {Extremely well isolated two-dimensional spin- 1 2 antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF},

  author       = {Opherden, D. and Nizar, N. and Richardson, K. and Monroe, J. C. and Turnbull, M. M. and Polson, M. and Vela, S. and Blackmore, W. J. A. and Goddard, P. A. and Singleton, J. and Choi, E. S. and Xiao, F. and Williams, R. C. and Lancaster, T. and Pratt, F. L. and Blundell, S. J. and Skourski, Y. and Uhlarz, M. and Ponomaryov, A. N. and Zvyagin, S. A. and Wosnitza, J. and Baenitz, M. and Heinmaa, I. and Stern, R. and Kühne, H. and Landee, C. P.},

  abstractNote = {We report on a comprehensive characterization of the newly synthesized Cu2+-based molecular magnet [Cu(pz)2(2-HOpy)2](PF6)2 (CuPOF), where pz=C4H4N2 and 2-HOpy=C5H4NHO. From a comparison of theoretical modeling to results of bulk magnetometry, specific heat, μ+SR, ESR, and NMR spectroscopy, this material is determined as an excellent realization of the two dimensional square-lattice S=12 antiferromagnetic Heisenberg model with a moderate intraplane nearest-neighbor exchange coupling of J/kB=6.80(5) K, and an extremely small interlayer interaction of about 1 mK. At zero field, the bulk magnetometry reveals a temperature-driven crossover of spin correlations from isotropic to XY type, caused by the presence of a weak intrinsic easy-plane anisotropy. A transition to long-range order, driven by the low-temperature XY anisotropy under the influence of the interlayer coupling, occurs at TN=1.38(2) K, as revealed by μ+SR. In applied magnetic fields, our H1-NMR data reveal a strong increase of the magnetic anisotropy, manifested by a pronounced enhancement of the transition temperature to commensurate long-range order at TN=2.8 K and 7 T.},

  doi          = {10.1103/PhysRevB.102.064431},

  journal      = {Physical Review B},

  number       = 6,

  volume       = 102,

  place        = {United States},

  year         = {Fri Aug 28 00:00:00 EDT 2020},

  month        = {Fri Aug 28 00:00:00 EDT 2020}

}

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Exact Relation between the Solid-on-Solid Model and the $XY$ Model
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Spin correlations in the 2D Heisenberg antiferromagnet ${Sr}_{2}$ ${CuO}_{2}$ ${Cl}_{2}$ : Neutron scattering, Monte Carlo simulation, and theory
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Superconductivity above 150 K in HgBa2Ca2Cu3O8+δ at high pressures
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Title: Extremely well isolated two-dimensional spin- 1 2 antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF

Abstract

Citation Formats

Double-slit photoelectron interference in strong-field ionization of the neon dimer journal, January 2019

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High-field ESR study of the dimerized-incommensurate phase transition in the spin-Peierls compound CuGeO3 journal, April 2004

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Study of the Superfluid Transition in Two-Dimensional He 4 Films journal, June 1978

Dimensionality Selection in a Molecule-Based Magnet journal, February 2012

Spin correlations of 2D quantum antiferromagnet at low temperatures and a direct comparison with neutron-scattering experiments journal, March 1990

Nonmonotonic field dependence of the Néel temperature in the quasi-two-dimensional magnet [ Cu ( HF 2 ) ( pyz ) 2 ] BF 4 journal, February 2009

Dimensional crossover in the magnetic properties of highly anisotropic antiferromagnets journal, April 1992

Erratum: Two-dimensional spin- 1 2 rectangular Heisenberg antiferromagnets: Simulation and experiment [Phys. Rev. B 84 , 104442 (2011)] journal, December 2011

Detection of X Y Behavior in Weakly Anisotropic Quantum Antiferromagnets on the Square Lattice journal, April 2003

Two-dimensional S = 1 2 Heisenberg antiferromagnets: Synthesis, structure, and magnetic properties journal, March 2002

Quantum Monte Carlo study of S = 1 2 weakly anisotropic antiferromagnets on the square lattice journal, March 2003

Antiferromagnetism in Sr 2 CuO 2 Cl 2 journal, February 1990

Valence bond description of antiferromagnetic coupling in transition metal dimers journal, May 1981

Néel Temperature of Quasi-Low-Dimensional Heisenberg Antiferromagnets journal, June 2005

Specific heat of quasi-two-dimensional antiferromagnetic Heisenberg models with varying interplanar couplings journal, September 2003

Magnetic order in the S = 1 ∕ 2 two-dimensional molecular antiferromagnet copper pyrazine perchlorate Cu ( Pz ) 2 ( Cl O 4 ) 2 journal, March 2007

Elucidating the 2D Magnetic Topology of the ‘Metal-Radical’ TTTA⋅Cu(hfac) 2 System journal, May 2014

Angle-resolved phase-sensitive determination of the in-plane gap symmetry in YBa2Cu3O7−δ journal, February 2006

An extremely well isolated 2D-antiferromagnetic layer journal, December 2010

Low-temperature behavior of two-dimensional quantum antiferromagnets journal, March 1988

Theory of magnetic order in the three-dimensional spatially anisotropic Heisenberg model journal, June 2000

What DO we know about high Tc? journal, March 2006

Theory of Two-Dimensional Melting journal, July 1978

Kosterlitz-Thouless Transition in Proximity-Coupled Superconducting Arrays journal, November 1981

Two-dimensional quantum Heisenberg antiferromagnet at low temperatures journal, February 1989

Calculation of microscopic exchange interactions and modelling of macroscopic magnetic properties in molecule-based magnets journal, January 2011

Experiments on simple magnetic model systems journal, January 1974

Muon-Fluorine Entangled States in Molecular Magnets journal, December 2007

Field-induced X Y and Ising ground states in a quasi-two-dimensional S = 1 2 Heisenberg antiferromagnet journal, November 2011

Superconductivity at 94 K in HgBa2Cu04+δ journal, March 1993

How grain boundaries limit supercurrents in high-temperature superconductors journal, June 2010

Dividing the Spoils: Role of Pyrazine Ligands and Perchlorate Counterions in the Magnetic Properties of Bis(pyrazine)diperchloratecopper(II), [Cu(pz) 2 ](ClO 4 ) 2 journal, October 2013

The Resonating Valence Bond State in La2CuO4 and Superconductivity journal, March 1987

Could in-plane exchange anisotropy induce the observed antiferromagnetic transitions in the undoped high- T c materials? journal, March 1992

Phase diagrams and critical behavior of a two-dimensional anisotropic Heisenberg antiferromagnet journal, August 1981

Critical Temperature and the Transition from Quantum to Classical Order Parameter Fluctuations in the Three-Dimensional Heisenberg Antiferromagnet journal, June 1998

Neutron scattering study of the two-dimensional spinS=1/2 square-lattice Heisenberg antiferromagnet Sr2CuO2Cl2 journal, December 1995

Dimensional crossover in the magnetic properties of highly anisotropic antiferromagnets. II. Paramagnetic phase journal, July 1993

Resolution limits in magic-angle rotation NMR spectra of polycrystalline solids journal, March 1982

Ligand spin polarization and antiferromagnetic coupling in transition metal dimers journal, November 1986

Observation of Quasicondensate in Two-Dimensional Atomic Hydrogen journal, November 1998

Solid-state lead-207 NMR of lead(II) nitrate: Localized heating effects at high magic angle spinning speeds journal, October 1995

Low-temperature properties of the quasi-two-dimensional antiferromagnetic Heisenberg model journal, May 1990

Experimentally determining the exchange parameters of quasi-two-dimensional Heisenberg magnets journal, August 2008

Field-induced XY behavior in the S = 1 2 antiferromagnet on the square lattice journal, August 2003

A short history of SHELX journal, December 2007

Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density journal, January 1988

Antiferromagnetic transitions in high-T c materials journal, October 1990

Possible highT c superconductivity in the Ba?La?Cu?O system journal, June 1986

19F nuclear spin coupling constants in solids by the high-speed rotation method journal, April 1970

Crystal Statistics. I. A Two-Dimensional Model with an Order-Disorder Transition journal, February 1944

Two-dimensional X Y behavior observed in quasi-two-dimensional quantum Heisenberg antiferromagnets journal, April 2009

Ab initio computations of effective exchange integrals for H–H, H–He–H and Mn2O2 complex: comparison of broken-symmetry approaches journal, March 2000

Spin-polarized muons in condensed matter physics journal, May 1999

Control of the third dimension in copper-based square-lattice antiferromagnets journal, March 2016

Spin Correlations and Magnetic Field Effects in the Weakly Anisotropic Square-Lattice Antiferromagnet Sr 2 CuO 2 Cl 2 journal, September 1995

Crystal structure refinement with SHELXL journal, January 2015

Paramagnon satellites in photoemission spectra of chemisorbed hydrogen journal, March 1975

Characterization of the Antiferromagnetism in Ag(pyz) 2 (S 2 O 8 ) (pyz = Pyrazine) with a Two-Dimensional Square Lattice of Ag 2+ Ions journal, April 2009

Ordering, metastability and phase transitions in two-dimensional systems journal, April 1973

Density‐functional thermochemistry. IV. A new dynamical correlation functional and implications for exact‐exchange mixing journal, January 1996

Magnetic order in quasi-two-dimensional molecular magnets investigated with muon-spin relaxation journal, August 2011

Exchange narrowing of electron spin resonance in a two-dimensional system journal, January 1974

Two-Dimensional Heisenberg Antiferromagnets: Syntheses, X-ray Structures, and Magnetic Behavior of [Cu(pz) 2 ](ClO 4 ) 2 , [Cu(pz) 2 ](BF 4 ) 2 , and [Cu(pz) 2 (NO 3 )](PF 6 ) journal, May 2007

EasySpin, a comprehensive software package for spectral simulation and analysis in EPR journal, January 2006

Superconductivity above 130 K in the Hg–Ba–Ca–Cu–O system journal, May 1993

Electron spin resonance studies on the organic linear-chain compounds ( TMT C F ) 2 X ( C = S , Se ; X = PF 6 , AsF 6 , ClO 4 , Br ) journal, January 2000

Spin structures of tetragonal lamellar copper oxides journal, June 1994

Anomalous High-Energy Spin Excitations in the High- T c Superconductor-Parent Antiferromagnet La 2 CuO 4 journal, December 2010

Superconductivity in the rare-earth-free Tl–Ba–Cu–O system above liquid-nitrogen temperature journal, March 1988

Magnetic Properties of Organic Molecular Crystals via an Algebraic Heisenberg Hamiltonian. Applications to WILVIW, TOLKEK, and KAXHAS Nitronyl Nitroxide Crystals journal, February 2002

Title: Extremely well isolated two-dimensional spin- $\frac{1}{2}$ antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF

Double-slit photoelectron interference in strong-field ionization of the neon dimer
journal, January 2019

Berezinskii–Kosterlitz–Thouless crossover in a trapped atomic gas
journal, June 2006

High-field ESR study of the dimerized-incommensurate phase transition in the spin-Peierls compound CuGeO3
journal, April 2004

Magnetic excitations in pure, lightly doped, and weakly metallic ${La}_{2}$ ${CuO}_{4}$
journal, December 1992

Magnetic properties of the quasi-two-dimensional $S = \frac{1}{2}$ Heisenberg antiferromagnet $[Cu {(pyz)}_{2} ({HF}_{2})] {PF}_{6}$
journal, February 2010

Two-dimensional spin- $\frac{1}{2}$ rectangular Heisenberg antiferromagnets: Simulation and experiment
journal, September 2011

Magnetic-field-induced Heisenberg to XY crossover in a quasi-2D quantum antiferromagnet
journal, December 2014

Density-functional exchange-energy approximation with correct asymptotic behavior
journal, September 1988

Study of the Superfluid Transition in Two-Dimensional ${}^{4}{He}$ Films
journal, June 1978

Dimensionality Selection in a Molecule-Based Magnet
journal, February 2012

Spin correlations of 2D quantum antiferromagnet at low temperatures and a direct comparison with neutron-scattering experiments
journal, March 1990

Nonmonotonic field dependence of the Néel temperature in the quasi-two-dimensional magnet $[Cu ({HF}_{2}) {(pyz)}_{2}] {BF}_{4}$
journal, February 2009

Dimensional crossover in the magnetic properties of highly anisotropic antiferromagnets
journal, April 1992

Erratum: Two-dimensional spin- $\frac{1}{2}$ rectangular Heisenberg antiferromagnets: Simulation and experiment [Phys. Rev. B 84 , 104442 (2011)]
journal, December 2011

Detection of $X Y$ Behavior in Weakly Anisotropic Quantum Antiferromagnets on the Square Lattice
journal, April 2003

Two-dimensional $S = \frac{1}{2}$ Heisenberg antiferromagnets: Synthesis, structure, and magnetic properties
journal, March 2002

Quantum Monte Carlo study of $S = \frac{1}{2}$ weakly anisotropic antiferromagnets on the square lattice
journal, March 2003

Antiferromagnetism in ${Sr}_{2}$ ${CuO}_{2}$ ${Cl}_{2}$
journal, February 1990

Valence bond description of antiferromagnetic coupling in transition metal dimers
journal, May 1981

Néel Temperature of Quasi-Low-Dimensional Heisenberg Antiferromagnets
journal, June 2005

Specific heat of quasi-two-dimensional antiferromagnetic Heisenberg models with varying interplanar couplings
journal, September 2003

Magnetic order in the $S = 1 ∕ 2$ two-dimensional molecular antiferromagnet copper pyrazine perchlorate $Cu {(Pz)}_{2} {(Cl O_{4})}_{2}$
journal, March 2007

Elucidating the 2D Magnetic Topology of the ‘Metal-Radical’ TTTA⋅Cu(hfac) ₂ System
journal, May 2014

Angle-resolved phase-sensitive determination of the in-plane gap symmetry in YBa2Cu3O7−δ
journal, February 2006

An extremely well isolated 2D-antiferromagnetic layer
journal, December 2010

Low-temperature behavior of two-dimensional quantum antiferromagnets
journal, March 1988

Theory of magnetic order in the three-dimensional spatially anisotropic Heisenberg model
journal, June 2000

What DO we know about high Tc?
journal, March 2006

Theory of Two-Dimensional Melting
journal, July 1978

Kosterlitz-Thouless Transition in Proximity-Coupled Superconducting Arrays
journal, November 1981

Two-dimensional quantum Heisenberg antiferromagnet at low temperatures
journal, February 1989

Calculation of microscopic exchange interactions and modelling of macroscopic magnetic properties in molecule-based magnets
journal, January 2011

Experiments on simple magnetic model systems
journal, January 1974

Muon-Fluorine Entangled States in Molecular Magnets
journal, December 2007

Field-induced $X Y$ and Ising ground states in a quasi-two-dimensional $S = \frac{1}{2}$ Heisenberg antiferromagnet
journal, November 2011

Superconductivity at 94 K in HgBa2Cu04+δ
journal, March 1993

How grain boundaries limit supercurrents in high-temperature superconductors
journal, June 2010

Dividing the Spoils: Role of Pyrazine Ligands and Perchlorate Counterions in the Magnetic Properties of Bis(pyrazine)diperchloratecopper(II), [Cu(pz) ₂ ](ClO ₄ ) ₂
journal, October 2013

The Resonating Valence Bond State in La2CuO4 and Superconductivity
journal, March 1987

Could in-plane exchange anisotropy induce the observed antiferromagnetic transitions in the undoped high- $T_{c}$ materials?
journal, March 1992

Phase diagrams and critical behavior of a two-dimensional anisotropic Heisenberg antiferromagnet
journal, August 1981

Critical Temperature and the Transition from Quantum to Classical Order Parameter Fluctuations in the Three-Dimensional Heisenberg Antiferromagnet
journal, June 1998

Neutron scattering study of the two-dimensional spinS=1/2 square-lattice Heisenberg antiferromagnet Sr2CuO2Cl2
journal, December 1995

Dimensional crossover in the magnetic properties of highly anisotropic antiferromagnets. II. Paramagnetic phase
journal, July 1993

Resolution limits in magic-angle rotation NMR spectra of polycrystalline solids
journal, March 1982

Ligand spin polarization and antiferromagnetic coupling in transition metal dimers
journal, November 1986

Observation of Quasicondensate in Two-Dimensional Atomic Hydrogen
journal, November 1998

Solid-state lead-207 NMR of lead(II) nitrate: Localized heating effects at high magic angle spinning speeds
journal, October 1995

Low-temperature properties of the quasi-two-dimensional antiferromagnetic Heisenberg model
journal, May 1990

Experimentally determining the exchange parameters of quasi-two-dimensional Heisenberg magnets
journal, August 2008

Field-induced $XY$ behavior in the $S = \frac{1}{2}$ antiferromagnet on the square lattice
journal, August 2003

A short history of SHELX
journal, December 2007

Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density
journal, January 1988

Antiferromagnetic transitions in high-T _c materials
journal, October 1990

Possible highT c superconductivity in the Ba?La?Cu?O system
journal, June 1986

19F nuclear spin coupling constants in solids by the high-speed rotation method
journal, April 1970

Crystal Statistics. I. A Two-Dimensional Model with an Order-Disorder Transition
journal, February 1944

Two-dimensional $X Y$ behavior observed in quasi-two-dimensional quantum Heisenberg antiferromagnets
journal, April 2009

Ab initio computations of effective exchange integrals for H–H, H–He–H and Mn2O2 complex: comparison of broken-symmetry approaches
journal, March 2000

Spin-polarized muons in condensed matter physics
journal, May 1999

Control of the third dimension in copper-based square-lattice antiferromagnets
journal, March 2016

Spin Correlations and Magnetic Field Effects in the Weakly Anisotropic Square-Lattice Antiferromagnet ${Sr}_{2} {CuO}_{2} {Cl}_{2}$
journal, September 1995

Crystal structure refinement with SHELXL
journal, January 2015

Paramagnon satellites in photoemission spectra of chemisorbed hydrogen
journal, March 1975

Characterization of the Antiferromagnetism in Ag(pyz) ₂ (S ₂ O ₈ ) (pyz = Pyrazine) with a Two-Dimensional Square Lattice of Ag ²⁺ Ions
journal, April 2009

Ordering, metastability and phase transitions in two-dimensional systems
journal, April 1973

Density‐functional thermochemistry. IV. A new dynamical correlation functional and implications for exact‐exchange mixing
journal, January 1996

Magnetic order in quasi-two-dimensional molecular magnets investigated with muon-spin relaxation
journal, August 2011

Exchange narrowing of electron spin resonance in a two-dimensional system
journal, January 1974

Two-Dimensional Heisenberg Antiferromagnets: Syntheses, X-ray Structures, and Magnetic Behavior of [Cu(pz) ₂ ](ClO ₄ ) ₂ , [Cu(pz) ₂ ](BF ₄ ) ₂ , and [Cu(pz) ₂ (NO ₃ )](PF ₆ )
journal, May 2007

EasySpin, a comprehensive software package for spectral simulation and analysis in EPR
journal, January 2006

Superconductivity above 130 K in the Hg–Ba–Ca–Cu–O system
journal, May 1993

Electron spin resonance studies on the organic linear-chain compounds $(TMT C F)_{2} X (C = S, Se;$ $X = {PF}_{6}, {AsF}_{6}, {ClO}_{4}, Br)$
journal, January 2000

Spin structures of tetragonal lamellar copper oxides
journal, June 1994

Anomalous High-Energy Spin Excitations in the High- $T_{c}$ Superconductor-Parent Antiferromagnet ${La}_{2} {CuO}_{4}$
journal, December 2010

Superconductivity in the rare-earth-free Tl–Ba–Cu–O system above liquid-nitrogen temperature
journal, March 1988

Magnetic Properties of Organic Molecular Crystals via an Algebraic Heisenberg Hamiltonian. Applications to WILVIW, TOLKEK, and KAXHAS Nitronyl Nitroxide Crystals
journal, February 2002

Exact Relation between the Solid-on-Solid Model and the $XY$ Model
journal, September 1977

Spin correlations in the 2D Heisenberg antiferromagnet ${Sr}_{2}$ ${CuO}_{2}$ ${Cl}_{2}$ : Neutron scattering, Monte Carlo simulation, and theory
journal, February 1994