The effect of spin dilution on magnetism of the linear chain system 𝛽-Cu2−𝑥Zn𝑥V2O7

Pramana

Niharika Mohapatra¹  S N Bhatia1¹  S K Malik²  R Nirmala² 

[1]Department of Physics, Indian Institute of Technology Bombay, Mumbai 400 076, India$$

[2]Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India$$

关键词: Antiferromagnetics;    spin chains;    spin waves;    magnetic properties.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

We have measured the magnetic susceptibility (𝜒) and heat capacity (𝐶p) of 𝛽-Cu2−𝑥Zn𝑥V2O7 (𝑥 = 0, 0.05, 0.1, 0.15, 0.2, 0.3, 2) in the temperature range 2–300 K. A one-dimensional alternating exchange Heisenberg antiferromagnetism (HAF) is observed in all compositions with chains of infinite length. The intra-chain exchange remains uniform and decreases marginally with dilution of the magnetic state. A cooperative ordering is seen in the magnetic chains for all Zn concentrations (𝑥 ≤ 0.3). The temperature of occurrence of this transition decreases with increasing Zn concentration. Though the conventional spin-wave theory has been used here to describe the properties of the ordered phase, the presence of some contributions like the lattice heat capacity in 𝐶p and the Curie–Weiss term in susceptibility introduces some uncertainties in the estimation of the proportions contributed by the spin system. Therefore, the nature of the ordered phase could not be ascertained unambiguously.

【 授权许可】

Unknown