Fine-Tuning of Magnetic Interactions in Organic Spin Ladders

Yamaguchi, Hironori; Miyagai, H.; Shimokawa, Tomotsugu; Iwase, Kenji; Ono, Toshio; Kono, Yohei; Kase, Naoki; Araki, Koji; Kittaka, Shunichiro; Sakakibara, Toshiro; Kawakami, Takashi; Okunishi, Kouichi; Hosokoshi, Yuko

doi:10.7566/jpsj.83.033707

Cited by 29 publications

(41 citation statements)

References 28 publications

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“…More recently, we have reported a new model material for an S = 1/2 spin ladder with FM leg interactions, 3-Br-4-F-V [= 3-(3-bromo-4-fluorophenyl)-1,5-diphenylverdazyl], where the Cl in 3-Cl-4-F-V is replaced by Br [17]. The low-temperature magnetization data are well described within the strong-rung regime with γ = 1.5 [17].…”

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confidence: 99%

Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs

et al. 2014

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We report magnetization, specific heat, and NMR measurements of 3-Br-4-F-V [= 3-(3-bromo-4fluorophenyl)-1,5-diphenylverdazyl], strong-rung S=1/2 Heisenberg spin ladder with ferromagnetic leg interactions. We explain the magnetic and thermodynamic properties based on the strong-rung regime. Furthermore, we find a field-induced successive phase transition in the specific heat and the nuclear spin-lattice relaxation rate 1/T 1 . 19 F-NMR spectra for higher and lower temperature phases indicate partial magnetic order and incommensurate long-range order, respectively, evidencing the presence of frustration due to weak interladder couplings.

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confidence: 99%

Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs

et al. 2014

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“…16. Specific-heat measurements were carried out by the standard quasiadiabatic heatpulse and relaxation methods on a 1.46-mg sample (#1).…”

Section: Methodsmentioning

confidence: 99%

“…In this regard, the coupling parameters of 3-Br-4-F-V might not satisfy the condition to observe this crossover, but the ν = 2/3 behavior at low temperatures agrees with the theory. Since the other two verdazyl-radical-based FM-leg ladders mentioned above are strong-leg type (|J || /J ⊥ | > 1) [15,16,18], they might be the candidates to observe the nontrivial crossover.…”

Section: Fitting Methods To Extract the Critical Fields And Exponenmentioning

confidence: 99%

“…) and only this compound has a spin gap (∼ 5 T) [16,17]. The other two compounds are antiferromagnetically ordered in the ground state due to 3D interactions [16].…”

Section: Introductionmentioning

confidence: 93%

“…The other two compounds are antiferromagnetically ordered in the ground state due to 3D interactions [16]. Compared with BPCB [11], which has a similar rung-coupling constant (J || /k B = 3.3 K, J ⊥ /k B = 12.9 K, and µ 0 H c2 ∼ 14.5 T), 3-Br-4-F-V actually has the smaller saturation field, µ 0 H c2 ∼ 9 T. In the magnetic field range between H c1 and H c2 , 3-Br-4-F-V exhibits a 3D incommensurate ordering due to interladder couplings below ∼0.6 K as revealed by nuclear magnetic resonance (NMR) measurements [17].…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional Bose-Einstein condensation in the spin- 12 ferromagnetic-leg ladder 3-Br-4-F-V

et al. 2017

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The critical exponent of the phase boundary has been examined on the three-dimensional incommensurate ordering phase in the spin-1/2 ferromagnetic-leg ladder 3-Br-4-F-V [=3-(3-bromo-4-fluorophenyl)-1,5-diphenylverdazyl]. Using the temperature-window fitting technique, we obtained the critical exponents which agreed with the three-dimensional (3D) Bose-Einstein condensation (BEC) universality class at both sides of the lower critical field and the saturation field. 3-Br-4-F-V thus becomes a new member of the quantum magnets which prove the universality of the 3D BEC exponent.

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Quantum Spin‐1/2 Dimers in a Low‐Dimensional Tetrabromocuprate Magnet

Sampson

Bristowe

Carr

et al. 2022

Chemistry A European J

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This work describes a homometallic spin-1 = 2 tetrabromocuprate adopting a bilayer structure. Magnetic-susceptibility measurements show a broad maximum centred near 70 K, with fits to this data using a Heisenberg model consistent with strong antiferromagnetic coupling between neighbouring copper atoms in different layers of the bilayer. There are further weak intralayer ferromagnetic interactions between copper cations in neighbouring dimers. Firstprinciples calculations are consistent with this, but suggest there is only significant magnetic coupling within one direction of a layer; this would suggest the presence of a spin ladder within the bilayer with antiferromagnetic rung and weaker ferromagnetic rail couplings.

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Fine-Tuning of Magnetic Interactions in Organic Spin Ladders

Abstract: We have succeeded in synthesizing two types of new organic radical crystals 3-I-V [= 3-

Cited by 29 publications

References 28 publications

Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs

Field-induced incommensurate phase in the strong-rung spin ladder with ferromagnetic legs

Three-dimensional Bose-Einstein condensation in the spin- 12 ferromagnetic-leg ladder 3-Br-4-F-V

Quantum Spin‐1/2 Dimers in a Low‐Dimensional Tetrabromocuprate Magnet

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