Aleksandr Sh. Samarin, Stanislav S. Fedotov, Hyun-Joo Koo, Mike Whangbo, Andrei Gippius, Sergei Zhurenko, Alexey V. Tkachev, Larisa Victorovna Shvanskaya, Alexander Vasiliev
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(<em>en</em>H<small><sub>2</sub></small>)<small><sub>0.5</sub></small>VPO<small><sub>4</sub></small>OH consists of uniform chains of V<small><sup>3+ </sup></small>(d<small><sup>2</sup></small>, <em>S</em> = 1) ions and exhibits Haldane magnetism with spin gap Δ = 59.3 K from the magnetic susceptibility χ(<em>T</em>) at µ<small><sub>0</sub></small><em>H</em> = 0.1 T, which is reduced to 48.4 K at µ<small><sub>0</sub></small><em>H</em> = 9 T according to the <small><sup>31</sup></small>P shift. The NMR data evidence the formation of a spin-glass state of unpaired <em>S</em> = 1/2 spins at <em>T</em><small><sub>S-G</sub></small> ≈ 3 K and indicate that the Haldane <em>S</em> = 1 spin chain segments are much longer in the organically templated magnet (<em>en</em>H<small><sub>2</sub></small>)<small><sub>0.5</sub></small>VPO<small><sub>4</sub></small>OH than in the ammonium counterpart NH<small><sub>4</sub></small>VPO<small><sub>4</sub></small>OH. The single-ion anisotropy <em>D</em> and the interchain exchange <em>J</em>' in (<em>en</em>H<small><sub>2</sub></small>)<small><sub>0.5</sub></small>VPO<small><sub>4</sub></small>OH and NH<small><sub>4</sub></small>VPO<small><sub>4</sub></small>OH were estimated in density functional calculations to find them very weak compared to the intrachain exchange <em>J</em>.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Observation of Haldane Magnetism in Organically Templated Vanadium Phosphate (enH2)0.5VPO4OH\",\"authors\":\"Aleksandr Sh. Samarin, Stanislav S. Fedotov, Hyun-Joo Koo, Mike Whangbo, Andrei Gippius, Sergei Zhurenko, Alexey V. Tkachev, Larisa Victorovna Shvanskaya, Alexander Vasiliev\",\"doi\":\"10.1039/d4dt01675k\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We prepared an organically templated magnet, (<em>en</em>H<small><sub>2</sub></small>)<small><sub>0.5</sub></small>VPO<small><sub>4</sub></small>OH (<em>en</em>H<small><sub>2</sub></small> = diprotonated ethylenediamine), hydrothermally and characterized its crystal structure by powder X-ray diffraction and Fourier-transform infrared spectroscopy, and its physical properties by magnetization, specific heat and nuclear magnetic resonance measurements and density functional theory calculations. (<em>en</em>H<small><sub>2</sub></small>)<small><sub>0.5</sub></small>VPO<small><sub>4</sub></small>OH consists of uniform chains of V<small><sup>3+ </sup></small>(d<small><sup>2</sup></small>, <em>S</em> = 1) ions and exhibits Haldane magnetism with spin gap Δ = 59.3 K from the magnetic susceptibility χ(<em>T</em>) at µ<small><sub>0</sub></small><em>H</em> = 0.1 T, which is reduced to 48.4 K at µ<small><sub>0</sub></small><em>H</em> = 9 T according to the <small><sup>31</sup></small>P shift. The NMR data evidence the formation of a spin-glass state of unpaired <em>S</em> = 1/2 spins at <em>T</em><small><sub>S-G</sub></small> ≈ 3 K and indicate that the Haldane <em>S</em> = 1 spin chain segments are much longer in the organically templated magnet (<em>en</em>H<small><sub>2</sub></small>)<small><sub>0.5</sub></small>VPO<small><sub>4</sub></small>OH than in the ammonium counterpart NH<small><sub>4</sub></small>VPO<small><sub>4</sub></small>OH. 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引用次数: 0
摘要
我们通过水热法制备了有机模板磁体 (enH2)0.5VPO4OH(enH2 = 二质子化乙二胺),并通过粉末 X 射线衍射和傅立叶变换红外光谱分析了其晶体结构,通过磁化、比热和核磁共振测量以及密度泛函理论计算分析了其物理性质。(enH2)0.5VPO4OH 由均匀的 V3+ (d2, S = 1) 离子链组成,具有霍尔丹磁性,在 µ0H = 0.1 T 时的磁感应强度 χ(T) 的自旋隙 Δ = 59.3 K,而根据 31P 移位,在 µ0H = 9 T 时自旋隙 Δ = 48.4 K。核磁共振数据证明了在 TS-G ≈ 3 K 时未配对的 S = 1/2自旋形成了自旋玻璃态,并表明在有机模板磁体 (enH2)0.5VPO4OH 中的霍尔丹 S = 1 自旋链段要比在铵对应物 NH4VPO4OH 中长得多。密度泛函计算估算了 (enH2)0.5VPO4OH 和 NH4VPO4OH 中的单离子各向异性 D 和链间交换 J',发现它们与链内交换 J 相比非常微弱。
Observation of Haldane Magnetism in Organically Templated Vanadium Phosphate (enH2)0.5VPO4OH
We prepared an organically templated magnet, (enH2)0.5VPO4OH (enH2 = diprotonated ethylenediamine), hydrothermally and characterized its crystal structure by powder X-ray diffraction and Fourier-transform infrared spectroscopy, and its physical properties by magnetization, specific heat and nuclear magnetic resonance measurements and density functional theory calculations. (enH2)0.5VPO4OH consists of uniform chains of V3+ (d2, S = 1) ions and exhibits Haldane magnetism with spin gap Δ = 59.3 K from the magnetic susceptibility χ(T) at µ0H = 0.1 T, which is reduced to 48.4 K at µ0H = 9 T according to the 31P shift. The NMR data evidence the formation of a spin-glass state of unpaired S = 1/2 spins at TS-G ≈ 3 K and indicate that the Haldane S = 1 spin chain segments are much longer in the organically templated magnet (enH2)0.5VPO4OH than in the ammonium counterpart NH4VPO4OH. The single-ion anisotropy D and the interchain exchange J' in (enH2)0.5VPO4OH and NH4VPO4OH were estimated in density functional calculations to find them very weak compared to the intrachain exchange J.
期刊介绍:
Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.