Magnetic-field-induced Quantum Phase in <i>S</i> = 1/2 Frustrated Trellis Lattice

Yamaguchi, Hironori; Yoshizawa, Daichi; Kida, Takanori; Hagiwara, Masayuki; Matsuo, Akira; Kono, Yohei; Sakakibara, Toshiro; Tamekuni, Yusuke; Miyagai, H.; Hosokoshi, Yuko

doi:10.7566/jpsj.87.043701

Cited by 2 publications

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“…Among efforts to acquire advanced molecule-based magnetic materials, rational molecular designs of component organic open shell entities have been crucial, and important attempts have been made. − Moreover, the more extensive the unpaired spin delocalization is, the larger will be the impact of substituent effects on the tuning of molecular electronic properties, underlain by exchange interactions in the crystalline state. , Recently, conjugated heavy atom heterocyclic radicals have been shown to be applicable as advanced conductive and magnetic materials as a consequence of easily tunable spin distributions and the ability to modify their crystal packing. ,, We note, however, that due to the persistence of such radicals and complicated synthetic procedures to obtain them, to date, the diversity of the hybrid organic radicals is rather poor. In this work, we have synthesized a series of stable all-organic hybrid nitroxides 1 (Figure ), in which phenoxyl is compactly π-conjugated, as new potential building blocks of advanced organic magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of π-Conjugated Hybrid Phenoxyl–Nitroxide Radicals with Extended π-Spin Delocalization

et al. 2020

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A series of stable and genuinely organic open-shell systems, π-conjugated phenoxyl–nitroxide free radicals (hybrid phenoxyl–nitroxide radicals), have been synthesized and their magnetic properties in the crystalline state investigated, revealing their usefulness as new building blocks for molecular magnetic materials. The salient electronic structure of the hybrid phenoxyl–nitroxide radicals is extended π-spin delocalization from the nitroxide moiety, mediating the localization effect intrinsic to nitroxide radicals. Five representative hybrid radicals containing an aliphatic, aromatic, and heteroaromatic substituent in the side part of the compact hybrid radical centers were synthesized, and their molecular/crystal structures in the crystalline state were determined by X-ray diffraction analyses. CW X-band ESR, 1H-ENDOR spectroscopy, and DFT calculations for the hybrid radicals confirmed that an unpaired spin delocalizes over the whole molecular frame including the nonconjugated fragments, suggesting the possibility of tuning their electronic properties through substituent effects in the crystalline state. Significant influence of the phenoxyl moiety on the electronic structure was analyzed in terms of the g-tensor calculations. The SQUID magnetization measurements revealed that the nitroxides bearing alkyl or aromatic substituents behave as 3D Curie–Weiss paramagnets with weak antiferromagnetic (AFM) (Θ = −1 to −2.6 K) or ferromagnetic (FM) (Θ = +0.33 K) spin–spin exchange interactions. On the other hand, heteroaromatically substituted hybrid phenoxyl–nitroxide showed significant AFM interactions with J/k B = −25.6 K. The analysis of the bulk magnetic properties based on the crystallographic data and DFT calculations revealed competition between the intermolecular AFM and FM interactions which originate from the C–O(phenoxyl)···Me(nitroxide) or (N)O–C(arom) infinite 1D head-to-tail chains and the C(arom)–C(arom) head-over-tail dimers forming 3D networks in their crystal lattices.

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Section: Introductionmentioning

confidence: 99%

Magnetic Properties of π-Conjugated Hybrid Phenoxyl–Nitroxide Radicals with Extended π-Spin Delocalization

et al. 2020

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“…The weak interladder exchange interactions in these materials form an effective 2D trellis like structure. Recently Yamaguchi et al showed magnetic field induced spin nematic phase in the verdazyl radical β-2,3,5-Cl 3 -V [27]. The J 1 -J 2 -J 3 spin system promises a zoo of exotic phases.…”

Section: Introductionmentioning

confidence: 99%

Melting of ferromagnetic order on a trellis ladder

Maiti

Kumar

2019

Journal of Magnetism and Magnetic Materials

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The ground state properties of a frustrated spin-1/2 system is studied on a trellis ladder which is composed of two zigzag ladders interacting through rung interactions. The presence of rung interaction between the zigzag ladders induces a non-magnetic ground state, although, each of zigzag ladders has ferromagnetic order in weak anti-ferromagnetic leg interaction limit. The rung interaction also generates rung dimers and opens spin gap which increases rapidly with rung interaction strength. The correlation between spins decreases exponentially with the distance between them. Figure 1: Two coupled zigzag ladders form trellis ladder. The broken lines show the extension of trellis ladder to trellis lattice structure. The arrows show respective spin arrangements. The reference site is labeled by '0' and the distances of all other sites are shown with respect to it. The distance of the sites in the same zigzag ladder as the reference site are written in bold numbers, and the sites on the other ladder are written in normal numbers.and rung couplings of a normal ladder, respectively and J 1 is inter-ladder coupling through zigzag bonds.There are several theoretical studies for two coupled zigzag ladders, e.g. a two-leg honeycomb ladder is considered in Ref. [19], where both J 1 and J 2 are AFM, but J 3 can be either FM or AFM. This system shows two types of Haldane phases for the FM J 3 and, columnar dimer and rung singlet phases for the AFM J 3 . Normand et al. considered the similar coupled ladders with all three AFM J 1 , J 2 and J 3 interactions. They find dimerized chains for large J 2 and small J 3 limit, spiral long range order for both large J 2 and J 3 limit, Néel long range order in the small J 2 < 0.4 and for all J 3 [20]. Ronald et al. have shown the effect of inter-chain coupling on spiral ground state of J 1 − J 2 model [21]. The effect of inter-ladder coupling on spin gap and magnon dispersion has been discussed in [22] exploiting a theoretical model which has also been

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Magnetic-field-induced Quantum Phase in S = 1/2 Frustrated Trellis Lattice

Cited by 2 publications

References 35 publications

Magnetic Properties of π-Conjugated Hybrid Phenoxyl–Nitroxide Radicals with Extended π-Spin Delocalization

Magnetic Properties of π-Conjugated Hybrid Phenoxyl–Nitroxide Radicals with Extended π-Spin Delocalization

Melting of ferromagnetic order on a trellis ladder

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