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Nath, R.; Padmanabhan, M.; Baby, Shiney; Thirumurugan, A.; Ehlers, D.; Hemmida, M.; Nidda, H.-A. Krug von; Tsirlin, Alexander A.

doi:10.1103/physrevb.91.054409

Cited by 25 publications

(23 citation statements)

References 42 publications

(26 reference statements)

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“…(a) (b) Similarly, it was shown in reference [79], that the susceptibility and isothermal magnetization of Cu(PM)(EA)2 (PM = [C6H2(COO)4] 4− , EA = [C2H5NH3] + ) can be described by the model (Equation (4)) with various R in a wide range of temperatures and magnetic fields ( Figure 5). Similarly, it was shown in reference [79], that the susceptibility and isothermal magnetization of Cu(PM)(EA) 2 (PM = [C 6 H 2 (COO) 4 ] 4− , EA = [C 2 H 5 NH 3 ] + ) can be described by the model (Equation (4)) with various R in a wide range of temperatures and magnetic fields ( Figure 5). in further analysis as was demonstrated in the analysis of the susceptibility of Cu(NCS)2 where the first-principle calculations enabled to identify the material as the realization of the rectangular lattice with J/kB ≈ 170 K and R ≈ 0.08 [78].…”

Section: The S = 1/2 Heisenberg Antiferromagnet On the Spatially Anissupporting

confidence: 59%

“…(a) (b) Similarly, it was shown in reference [79], that the susceptibility and isothermal magnetization of Cu(PM)(EA)2 (PM = [C6H2(COO)4] 4− , EA = [C2H5NH3] + ) can be described by the model (Equation (4)) with various R in a wide range of temperatures and magnetic fields ( Figure 5). Apparently, using proper parameters, various theoretical predictions yield identical behavior for both, susceptibility and magnetization [79]. Thus, making conclusions on the basis of magnetic data only, can be very tricky, since the height of the maximum, χ max , as well as its position, T max , depend on the J and g-factor values.…”

Section: The S = 1/2 Heisenberg Antiferromagnet On the Spatially Anissupporting

confidence: 59%

“…Unlike the susceptibility, another bulk property, specific heat, can provide more valuable information since the maximum, C max , depends on the used model ( Figure 6). The best agreement was found for R = 0.7 as predicted by the first-principle calculations [79]. Apparently, using proper parameters, various theoretical predictions yield identical behavior for both, susceptibility and magnetization [79].…”

Section: The S = 1/2 Heisenberg Antiferromagnet On the Spatially Anismentioning

confidence: 59%

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Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2

et al. 2018

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Quantum Heisenberg chain and square lattices are important paradigms of a low-dimensional magnetism. Their ground states are determined by the strength of quantum fluctuations. Correspondingly, the ground state of a rectangular lattice interpolates between the spin liquid and the ordered collinear Néel state with the partially reduced order parameter. The diversity of additional exchange interactions offers variety of quantum models derived from the aforementioned paradigms. Besides the spatial anisotropy of the exchange coupling, controlling the lattice dimensionality and ground-state properties, the spin anisotropy (intrinsic or induced by the magnetic field) represents another important effect disturbing a rotational symmetry of the spin system. The S = 1/2 easy-axis and easy-plane XXZ models on the square lattice even for extremely weak spin anisotropies undergo Heisenberg-Ising and Heisenberg-XY crossovers, respectively, acting as precursors to the onset of the finite-temperature phase transitions within the two-dimensional Ising universality class (for the easy axis anisotropy) and a topological Berezinskii-Kosterlitz-Thouless phase transition (for the easy-plane anisotropy). Experimental realizations of the S = 1/2 two-dimensional XXZ models in bulk quantum magnets appeared only recently. Partial solutions of the problems associated with their experimental identifications are discussed and some possibilities of future investigations in quantum magnets on the square and rectangular lattice are outlined.Heisenberg models [6][7][8]. Berezinskii revealed that eigenstates of the Hamiltonian describing the 2D lattice of planar rotators, 2D Bose liquid, and 2D XY magnet can be sorted into two classes; localized "vortices" characterized by a nonzero circulation along a minimum closed contour of the square lattice and displaced harmonic oscillations-spin waves with zero circulation [9,10]. Below a critical temperature related to some phase transition, the vortices form configurations with a total zero circulation. Kosterlitz and Thouless introduced a definition of a topological long-range order adopted from the dislocation theory of melting [11]. In a 2D crystal, authors showed that at low temperatures, dislocations with Burgers vector of the magnitude b tend to form closely bound dipole pairs with resulting b = 0. Above some critical temperature, the pairs start to dissociate and the dislocations will appear spontaneously. The same type of argument can be applied for the 2D XY model and 2D neutral superfluid. While in the 2D XY model, a logarithmically large energy barrier, V(r)~-ln(r), stabilizes a topological order formed by the bound pairs of vortices, in the case of the 2D Heisenberg model, there is no topological order, since energy barriers separating different configurations are small, allowing continuous changes between individual configurations [11].Many theoretical studies showed that phase transitions in the 2D systems such as granular superconducting films, superfluid films, 2D Coulomb gas etc., with c...

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Section: The S = 1/2 Heisenberg Antiferromagnet On the Spatially Anissupporting

confidence: 59%

“…(a) (b) Similarly, it was shown in reference [79], that the susceptibility and isothermal magnetization of Cu(PM)(EA)2 (PM = [C6H2(COO)4] 4− , EA = [C2H5NH3] + ) can be described by the model (Equation (4)) with various R in a wide range of temperatures and magnetic fields ( Figure 5). Apparently, using proper parameters, various theoretical predictions yield identical behavior for both, susceptibility and magnetization [79]. Thus, making conclusions on the basis of magnetic data only, can be very tricky, since the height of the maximum, χ max , as well as its position, T max , depend on the J and g-factor values.…”

Section: The S = 1/2 Heisenberg Antiferromagnet On the Spatially Anissupporting

confidence: 59%

Section: The S = 1/2 Heisenberg Antiferromagnet On the Spatially Anismentioning

confidence: 59%

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Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2

et al. 2018

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“…18,19 We have recently demonstrated that the organic moieties can modulate both the structural and magnetic features between metal ions significantly as the organic ligand NIPA leads to the formation of a hourglass nanomagnet Cu 5 (NIPA) 4 (OH) 2 .11H 2 O with two antiferromagnetic (AFM) and one ferromagnetic (FM) couplings between Cu 2+ ions 20 while another similar ligand leads to the formation of a quasi-two-dimensional (2D) AFM with weakly anisotropic spin-1/2 square lattice. 21 Cu(1,3-bdc) is another well studied compound where Cu 2+ ions are connected via IPA forming a perfect Kagomé lattice with strong magnetic frustration. 22 It undergoes a magnetic long-range-order (LRO) at T N 1.77 K. We have reported that in such Kagomé lattices by changing the ligand it is possible to tune the magnetic ground state keeping the crystal structure intact.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of spin-1/2 dimer compound Cu₂(IPA)₂(DMF)(H₂O) with a large spin gap

Thamban

Arjun

Padmanabhan

et al. 2017

J. Phys.: Condens. Matter

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We present the synthesis and a detailed investigation of structural and magnetic properties of metal-organic compound Cu2(IPA)2(DMF)(H2O) by means of x-ray diffraction, magnetization, and heat capacity measurements. Single crystals of the title compound were synthesized by judicious selection of organic ligand and employing a selective hydrothermal reaction route. It crystallizes in an orthorhombic structure with space group Cmca. The structural analysis revealed that two Cu 2+ ions are held together by the organic component (-O-C-O-) in a square paddle-wheel to form spin dimers which are aligned perpendicular to each other and are further coupled through organic ligands (isophthalic acid) forming two-dimensional layers. Temperature dependent magnetic susceptibility χ(T ) could be described well using spin-1/2 dimer model. The spin susceptibility χspin(T ) shows an exponential decrease in the low temperature region, below the broad maximum, confirming the singlet ground state with a large spin gap of ∆/kB 409 K. The heat capacity Cp measured as a function of temperature also confirms the absence of magnetic long-range-order down to 2 K.

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“…The absence of corresponding theoretical predictions and difficulties with preparation of such materials did not allow finding proper experimental realizations. A few realizations of SASL with spin 1/2 appeared only recently [4,5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Magneto-Structural Correlations in Low-Dimensional Quantum Magnets Cu(en)Cl₂and Cu(tn)Cl₂

et al. 2018

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The present work is focused on the investigation of magneto-structural correlations in Cu(en)Cl2 and Cu(tn)Cl2. A comparative study of powder susceptibility and magnetization of both compounds revealed that the replacement of tn by en ligand did not affect single-ion properties. On the other hand, the structure modification led to significant reduction of magnetic interactions as well as lowering the crystal symmetry. The impact of the high pressure on magnetic properties of the compounds is discussed.

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Quasi-two-dimensionalS=12magnetism ofCu[C6H2(<

Cited by 25 publications

References 42 publications

Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2

Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2

Structural and magnetic properties of spin-1/2 dimer compound Cu₂(IPA)₂(DMF)(H₂O) with a large spin gap

Experimental Study of Magneto-Structural Correlations in Low-Dimensional Quantum Magnets Cu(en)Cl₂and Cu(tn)Cl₂

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Quasi-two-dimensionalS=12magnetism ofCu[C6H2(<

Cited by 25 publications

References 42 publications

Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2

Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2

Structural and magnetic properties of spin-1/2 dimer compound Cu2(IPA)2(DMF)(H2O) with a large spin gap

Experimental Study of Magneto-Structural Correlations in Low-Dimensional Quantum Magnets Cu(en)Cl2and Cu(tn)Cl2

Contact Info

Product

Resources

About

Structural and magnetic properties of spin-1/2 dimer compound Cu₂(IPA)₂(DMF)(H₂O) with a large spin gap

Experimental Study of Magneto-Structural Correlations in Low-Dimensional Quantum Magnets Cu(en)Cl₂and Cu(tn)Cl₂