Synthesis, Structure, and Magnetic Properties of an Antiferromagnetic Spin-Ladder Complex:  Bis(2,3-dimethylpyridinium) Tetrabromocuprate

Evolution of the ESR absorption in a strong-leg spin ladder magnet (C7H10N2)2CuBr4 (abbreviated as DIMPY) is studied from 300 K to 400 mK. Temperature dependence of the ESR relaxation follows a staircase of crossovers between different relaxation regimes. We ague that the main mechanism of ESR line broadening in DIMPY is uniform Dzyaloshinskii-Moria interaction (|D| = 0.20 K) with an effective longitudinal component along an exchange bond of Cu ions within the legs resulting from the low crystal symmetry of DIMPY and nontrivial orbital ordering. The same DzyaloshinskiiMoriya interaction results in the lifting of the triplet excitation degeneracy, revealed through the weak splitting of the ESR absorption at low temperatures.

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“…8 Asgrown crystals have a well developed plane orthogonal to the b-axis and are elongated along the a direction.…”

Section: Samples and Experimental Detailsmentioning

confidence: 99%

ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction

et al. 2015

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“…Dagotto, Rice, et al predicted that the even-leg spin ladder is in a spin-liquid ground state at low temperatures and has a finite spin gap and that it can exhibit superconductivity when doped with a hole. 13 Therefore, a number of experimental studies have been carried out on the spin ladder system. 421 The inorganic cuprate spin ladder, in particular, has been of significant interest.…”

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confidence: 99%

A Cuprate Spin Ladder Linked by a Pyridyl Ligand

et al. 2014

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We succeeded in synthesizing a novel cuprate compound, [Cu 2 (CO 3 ) 2 (bpp) 2.5 ]¢5.5H 2 O (1) (bpp: 1,3-bis(4-pyridyl)propane). Its structural determination reveals that 1 has a ladderlike configuration formed by the alternate stacking of two Cu 2+ ions and a CO 3 2¹ ion, each of which is linked by a bpp molecule. The results of magnetic susceptibility measurements indicate that the obtained magnetic susceptibility curve can be reproduced faithfully by a magnetically isolated spin ladderbased model with the ladder-rung magnetic interaction, J rung / k B = 366 K and the ladder-leg interaction, J leg /k B = 11.5 K, where J is defined as being positive (negative) for antiferromagnetic (ferromagnetic) interactions.Low-dimensional quantum magnets have been extensively investigated owing to their fascinating physical properties. In particular, S = 1/2 Heisenberg spin ladder materials, which have an intermediate-type structure that lies between a onedimensional chain and a two-dimensional square lattice, have attracted much attention. Dagotto, Rice, et al. predicted that the even-leg spin ladder is in a spin-liquid ground state at low temperatures and has a finite spin gap and that it can exhibit superconductivity when doped with a hole. 13 Therefore, a number of experimental studies have been carried out on the spin ladder system. 421 The inorganic cuprate spin ladder, in particular, has been of significant interest. This is not only because it is constructed by CuO bonds in the same manner as the mother materials of high-T c superconductors but also because its physical properties illustrate the consistency between theoretical predictions and experimental results. For example, several cuprate spin ladders such as (Sr,Ca) 2,25,26 Consequently, elucidating the effects of interladder interactions is essential for studying spin ladders. Therefore, if a spin ladder can be constructed such that the interladder interactions are controllable, it will help elucidate the spin texture and superconductive mechanism of the spin ladder system. However, to the best of our knowledge, no study has been able to accomplish this.On the other hand, molecular spin ladders, 1221 which have also been extensively studied, may be better suited for achieving this goal owing to their flexibility. Given these considerations, we attempted to and were successful in synthesizing such cuprate spin ladders, which consisted of Cu 2+ and CO 3 2¹ ions as well as uncoordinated ClO 4 ¹ anions, which were located between the ladders; here, the ClO 4 ¹ anions played a role in magnetically isolating the cuprate ladders.27 In this study, we employed a pyridyl-containing ligand as the linker between the ladders. Because this molecule has been used successfully for controlling the pore size in metalorganic frameworks, 28,29 this approach should be applicable for controlling the interladder interactions by adjusting the alkyl chain length. Herein, we discuss the synthesis, structure, and magnetic properties of [Cu 2 -(CO 3 ) 2 (bpp) 2.5 ]¢5.5H 2 O (1) (bpp:...

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“…3(A). Measurements of susceptibility [42] and specific heat [34] are consistent with a spin ladder in the strong-leg regime. The spin excitation spectrum was studies by inelastic neutron scattering on a partially (67%) deuterated single crystal sample and confirmed a spin gap of ∆ = 0.32(2) meV [34].…”

Section: Preparing the Crystals For Experimentsmentioning

confidence: 56%

“…The first realization of a strong-leg organometallic Heisenberg spin ladder is the compound Bis(2,3-dimethylpyridinium)-Tetrabromocuprate (DIMPY) [42,43]. DIMPY crystallizes in the monoclinic space group P 2 1 /n with lattice parameters a perexchange.…”

Section: Preparing the Crystals For Experimentsmentioning

confidence: 99%

Crystals for neutron scattering studies of quantum magnetism

Yankova

Hüvonen

Mühlbauer

et al. 2012

Philosophical Magazine

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We review a strategy for targeted synthesis of large single crystal samples of prototype quantum magnets for inelastic neutron scattering experiments. Four case studies of organic copper halogenide S = 1/2 systems are presented. They are meant to illustrate that exciting experimental results pertaining to forefront many-body quantum physics can be obtained on samples grown using very simple techniques, standard laboratory equipment, and almost no experience in in advanced crystal growth techniques.

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Synthesis, Structure, and Magnetic Properties of an Antiferromagnetic Spin-Ladder Complex: Bis(2,3-dimethylpyridinium) Tetrabromocuprate

Cited by 123 publications

References 65 publications

ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction

ESR study of the spin ladder with uniform Dzyaloshinskii-Moriya interaction

A Cuprate Spin Ladder Linked by a Pyridyl Ligand

Crystals for neutron scattering studies of quantum magnetism

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