Low Dimensional Quantum Magnetism in the Copper Oxides

Aharony, Amnon; Entin‐Wohlman, O.; Harris, A. B.

doi:10.1007/978-94-011-4988-4_13

Cited by 3 publications

(3 citation statements)

References 40 publications

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“…The nearly gapless magnon dispersion observed by resonant inelastic x-ray scattering (RIXS) is consistent with those expected for IHAF [8]. The 2D IHAF of Sr 2 IrO 4 is reminiscent of the isostructural compound La 2 CuO 4 , a parent Mott insulator of high-T c superconductor with 2D S = 1/2 IHAF [9,10]. The similarity of two compounds led the theoretical prediction of possible superconductivity in Sr 2 IrO 4 upon doping [11][12][13] and the observation of Fermi arcs and d-wave gap on the doped surface of Sr 2 IrO 4 [14][15][16].…”

Section: Introductionsupporting

confidence: 73%

Model analysis of magnetic susceptibility of Sr2IrO4 : A two-dimensional Jeff=12

et al. 2016

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We report the analysis of magnetic susceptibility χ(T ) of Sr2IrO4 single crystal in the paramagnetic phase. We formulate the theoretical susceptibility based on isotropic Heisenberg antiferromagnetism incorporating the Dzyaloshinsky-Moriya interaction exactly, and include the interlayer couplings in a mean-field approximation. χ(T ) above TN was found to be well described by the model, indicating the predominant Heisenberg exchange consistent with the microscopic theory. The analysis points to a competition of nearest and next-nearest neighbor interlayer couplings, which results in the up-up-down-down configuration of the in-plane canting moments identified by the diffraction experiments.

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Section: Introductionsupporting

confidence: 73%

Model analysis of magnetic susceptibility of Sr2IrO4 : A two-dimensional Jeff=12

et al. 2016

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“…31,34,35 The DM interaction, which is a perturbation on the Heisenberg spin Hamiltonian, is present if there is no inversion center between magnetic sites, and its strength is linearly proportional to the spin-orbit coupling. [36][37][38] It has been experimentally observed in spin frustrated perovskite cuprates, [39][40][41][42][43][44][45][46] the pyrochlore antiferromagnet Cu 4 O 3 , 47 and molecule-based magnets. [48][49][50][51][52] The microscopic calculations of the DM interaction on the kagome lattice have been carried out by Elhajal et al 36 by applying Moriya's formulation.…”

mentioning

confidence: 99%

Dzyaloshinskii-Moriya interaction and spin reorientation transition in the frustrated kagome lattice antiferromagnet

et al. 2011

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Magnetization, specific heat, and neutron scattering measurements were performed to study a magnetic transition in jarosite, a spin-5 2 kagome lattice antiferromagnet. When a magnetic field is applied perpendicular to the kagome plane, magnetizations in the ordered state show a sudden increase at a critical field Hc, indicative of the transition from antiferromagnetic to ferromagnetic states. This sudden increase arises as the spins on alternate kagome planes rotate 180• to ferromagnetically align the canted moments along the field direction. The canted moment on a single kagome plane is a result of the Dzyaloshinskii-Moriya interaction. For H < Hc, the weak ferromagnetic interlayer coupling forces the spins to align in such an arrangement that the canted components on any two adjacent layers are equal and opposite, yielding a zero net magnetic moment. For H > Hc, the Zeeman energy overcomes the interlayer coupling causing the spins on the alternate layers to rotate, aligning the canted moments along the field direction. Neutron scattering measurements provide the first direct evidence of this 180• spin rotation at the transition.

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“…The unknown Heisenberg exchange coupling j inter or an unknown dipolar interaction between different EuP 2 planes has-on the mean-field level-no effect on the ordering temperature as a hypothetically given Neél order in one plane would not cause a mean field on a Eu site in a neighbouring plane. However, the unknown anisotropies of the interplanar exchange and pseudodipolar couplings between neighbouring planes tend to stabilize the magnetic order [18].…”

Section: Competing Effects On the Magnetic Ordering Temperaturementioning

confidence: 99%

Covalency effects on the magnetism of EuRh₂P₂

Schmitz¹,

Mueller-Hartmann²

2008

J. Phys.: Condens. Matter

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In experiments, the ternary Eu pnictide EuRh2P2 shows an unusual coexistence of a non-integral Eu valence of about 2.2 and a rather high Néel temperature of 50 K. In this paper, we present a model which explains the non-integral Eu valence via covalent bonding of the Eu 4f-orbitals to P2 molecular orbitals. In contrast to intermediate valence models where the hybridization with delocalized conduction band electrons is known to suppress magnetic ordering temperatures to at most a few Kelvin, covalent hybridization to the localized P2 orbitals avoids this suppression. Using perturbation theory we calculate the valence, the high temperature susceptibility, the Eu singleion anisotropy and the superexchange couplings of nearest and next-nearest neighbouring Eu ions. The model predicts a tetragonal anisotropy of the Curie constants. We suggest an experimental investigation of this anisotropy using single crystals. From experimental values of the valence and the two Curie constants, the three free parameters of our model can be determined.

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Low Dimensional Quantum Magnetism in the Copper Oxides

Cited by 3 publications

References 40 publications

Model analysis of magnetic susceptibility of Sr2IrO4 : A two-dimensional Jeff=12

Model analysis of magnetic susceptibility of Sr2IrO4 : A two-dimensional Jeff=12

Dzyaloshinskii-Moriya interaction and spin reorientation transition in the frustrated kagome lattice antiferromagnet

Covalency effects on the magnetism of EuRh₂P₂

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Low Dimensional Quantum Magnetism in the Copper Oxides

Cited by 3 publications

References 40 publications

Model analysis of magnetic susceptibility of Sr2IrO4 : A two-dimensional Jeff=12

Model analysis of magnetic susceptibility of Sr2IrO4 : A two-dimensional Jeff=12

Dzyaloshinskii-Moriya interaction and spin reorientation transition in the frustrated kagome lattice antiferromagnet

Covalency effects on the magnetism of EuRh2P2

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Covalency effects on the magnetism of EuRh₂P₂