Magnetic frustration driven by conduction carrier blocking in Nd2Co0.85Si2.88
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- Saha Institute of Nuclear Physics, Kolkata (India)
- Saha Institute of Nuclear Physics, Kolkata (India); Ames Lab., Ames, IA (United States)
- Ames Lab., Ames, IA (United States)
- Council of Scientific and Industrial Research (CSIR), New Delhi (India). Central Electro Chemical Research Institute (CECRI); Academy of Scientific and Innovative Research (AcSIR) (India)
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
The intermetallic compound Nd2Co0.85Si2.88 having a triangular lattice could be synthesized in single phase only with defect crystal structure. Investigation through different experimental techniques indicate the presence of two magnetic transitions in the system. As verified experimentally and theoretically, the high-temperature transition $$T_H$$ ~ 140 K is associated with the development of ferromagnetic interaction between itinerant Co moments, whereas the low-temperature transition at $$T_L$$ ~ 6.5 K is due to the coupling among Nd–4$$\textit{f}$$ and Co–3$$\textit{d}$$ moments, which is antiferromagnetic in nature. Detailed studies of temperature-dependent dc magnetic susceptibility, field dependence of isothermal magnetization, nonequilibrium dynamical behavior, viz., magnetic relaxation, aging effect, magnetic-memory effect, and temperature dependence of heat capacity, along with density functional theory (DFT) calculations, suggest that the ground state is magnetically frustrated spin glass in nature, having competing magnetic interactions of equivalent energies. DFT results further reveal that the 3$$\textit{d}$$/5$$\textit{d}$$-conduction carriers are blocked in the system and act as a barrier for the 4$$\textit{f}$$–4$$\textit{f}$$ RKKY interactions, resulting in spin frustration. Presence of vacancy defects in the crystal are also conducive to the spin frustration. This is an unique mechanism of magnetic frustration, not emphasized so far in any of the ternary $$R_2TX_3$$ ($$\textit{R}$$ = rare earth, $$\textit{T}$$ = transition elements, and $$\textit{X}$$ = Si, Ge, In) type compounds. Due to the competing character of the itinerant 3$$\textit{d}$$ and localized 4$$\textit{f}$$ moments, the compound exhibits anomalous field dependence of magnetic coercivity. Further, the system also exhibits a considerable magnetic entropy change of –Δ$$S_M$$ ~ 13.3 J/kg K with a relative cooling power (RCP) of 220 J/kg and adiabatic temperature change $$ΔT_{\text{ad}}$$ of 6 K for magnetic field change of 70 kOe.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Council of Scientific and Industrial Research (CSIR); Department of Atomic Energy (DAE) of India; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1969488
- Alternate ID(s):
- OSTI ID: 1963976
- Report Number(s):
- IS-J-11,035; TRN: US2313417
- Journal Information:
- Physical Review. B, Vol. 107, Issue 9; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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