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Doping effects in the coupled, two-leg spin ladder BiCu(2)PO(6)
B Koteswararao1, A V Mahajan, L K Alexander
1Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India.
Doping BiCu(2)PO(6) with Zn or Ni influences its magnetic properties. Ni doping induces a spin-glass-like phase, while Zn doping suggests spin freezing, indicating complex magnetic behaviors in this spin ladder system.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- BiCu(2)PO(6) is a coupled two-leg spin ladder system exhibiting magnetic frustration.
- Understanding the effects of doping on its magnetic properties is crucial for exploring novel quantum phenomena.
Purpose of the Study:
- To investigate the impact of Zn, Ni, and Ca doping on the magnetic susceptibility and heat capacity of BiCu(2)PO(6).
- To characterize the magnetic phase transitions and interactions induced by different dopants.
Main Methods:
- Synthesis and characterization of undoped and doped BiCu(2)PO(6) samples using x-ray diffraction.
- Measurements of magnetic susceptibility (χ(T)) and heat capacity (C(p)(T)) as a function of temperature.
- Analysis of zero-field-cooled (ZFC) and field-cooled (FC) magnetic data.
Main Results:
- Zn doping leads to complete solid solubility and weak magnetic anomalies suggesting spin freezing, possibly due to frustrated interactions.
- Ni doping (up to 20%) results in prominent magnetic effects, with distinct ZFC and FC susceptibility curves indicating a spin-glass-like phase transition.
- Ca doping (up to 15%) and Pb doping did not reveal significant anomalies in the measured properties.
Conclusions:
- Doping BiCu(2)PO(6) significantly alters its magnetic ground state, with Ni inducing a spin-glass phase and Zn suggesting spin freezing.
- The results highlight the sensitivity of the spin ladder system to chemical substitutions and the role of frustration in its magnetic behavior.
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