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Published on: July 8, 2021
Broken chain effect in doped SrCuO2
S Chattopadhyay1, S Giri, S Majumdar
1Department of Solid State Physics, Indian Association for the Cultivation of Science, Kolkata, India.
Summary
Magnetic and nonmagnetic doping of SrCuO(2) reduces magnetic interactions and enhances chain breaking. Doping introduces nonlinear magnetization due to free spins, with Ni ions in a low spin state.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- SrCuO(2) is a spin chain compound exhibiting interesting magnetic properties.
- Doping is a common method to tune the physical properties of materials.
Purpose of the Study:
- To investigate the impact of magnetic (Ni) and nonmagnetic (Zn, Ga) doping on the magnetic behavior of SrCuO(2).
- To understand the relationship between doping concentration and magnetic interactions.
Main Methods:
- Systematic doping of SrCuO(2) with Ni, Zn, and Ga.
- Measurement of magnetic susceptibility and isothermal magnetization.
- Analysis of magnetic behavior as a function of temperature and doping concentration.
Main Results:
- Doping systematically reduces intrachain exchange interaction, largely independent of dopant type.
- An increasing low-temperature Curie tail with doping indicates enhanced chain breaking.
- Nonlinear isothermal magnetization arises from free/quasi-free spins in doped samples.
- Doped Ni(2+) ions are found to be in a low spin state (S=0).
Conclusions:
- Doping SrCuO(2) significantly alters its magnetic properties by weakening exchange interactions and promoting chain breaking.
- The observed magnetic behavior in doped samples can be explained by the presence of free spins and the low-spin state of Ni ions.
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