Critical behavior and magnetocaloric effect in
Abstract
Layered van der Waals ferromagnets are promising candidates for designing new spintronic devices. Here we investigated the critical properties and magnetocaloric effect connected with ferromagnetic transition in layered van der Waals $$VI_3$$ single crystals. The critical exponents $β = 0.244 (5)$ with a critical temperature $$T_c = 50.10 (2) K$$ and $γ = 1.028 (12)$ with $$T_c = 49.97 (5) K$$ are obtained from the modified Arrott plot, whereas $δ = 5.24 (2)$ is obtained from a critical isotherm analysis at $$T_c = 50 K$$. The magnetic entropy change $$-Δ S_M (T, H)$$ features a maximum at $$T_c$$, i.e., $$-ΔS^{max}_M ~ 2.64 (2.27) J kg^{-1} K^{-1}$$ with out-of-plane (in-plane) field change of $$5_T$$. This is consistent with $$-ΔS^{max}_M ~ 2.80 J kg^{-1} K^{-1}$$ deduced from heat capacity and the corresponding adiabatic temperature change $$ΔT_{ad} ~ 0.96 K$$ with out-of-plane field change of 5 T. The critical analysis suggests that the ferromagnetic phase transition in $$VI_3$$ is situated close to a three- to two-dimensional critical point. The rescaled $$ΔS_M (T, H)$$ curves collapse onto a universal curve, confirming a second-order type of the magnetic transition and reliability of the obtained critical exponents.
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1581216
- Alternate Identifier(s):
- OSTI ID: 1661649
- Report Number(s):
- BNL-219839-2020-JAAM
Journal ID: ISSN 2643-1564; PPRHAI; 013013
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Research
- Additional Journal Information:
- Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 1; Journal ID: ISSN 2643-1564
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; magnetism
Citation Formats
Liu, Yu, Abeykoon, Milinda, and Petrovic, C. Critical behavior and magnetocaloric effect in VI 3. United States: N. p., 2020.
Web. doi:10.1103/PhysRevResearch.2.013013.
Liu, Yu, Abeykoon, Milinda, & Petrovic, C. Critical behavior and magnetocaloric effect in VI 3. United States. https://doi.org/10.1103/PhysRevResearch.2.013013
Liu, Yu, Abeykoon, Milinda, and Petrovic, C. Mon .
"Critical behavior and magnetocaloric effect in VI 3". United States. https://doi.org/10.1103/PhysRevResearch.2.013013.
@article{osti_1581216,
title = {Critical behavior and magnetocaloric effect in VI 3},
author = {Liu, Yu and Abeykoon, Milinda and Petrovic, C.},
abstractNote = {Layered van der Waals ferromagnets are promising candidates for designing new spintronic devices. Here we investigated the critical properties and magnetocaloric effect connected with ferromagnetic transition in layered van der Waals $VI_3$ single crystals. The critical exponents $β = 0.244 (5)$ with a critical temperature $T_c = 50.10 (2) K$ and $γ = 1.028 (12)$ with $T_c = 49.97 (5) K$ are obtained from the modified Arrott plot, whereas $δ = 5.24 (2)$ is obtained from a critical isotherm analysis at $T_c = 50 K$. The magnetic entropy change $-Δ S_M (T, H)$ features a maximum at $T_c$, i.e., $-ΔS^{max}_M ~ 2.64 (2.27) J kg^{-1} K^{-1}$ with out-of-plane (in-plane) field change of $5_T$. This is consistent with $-ΔS^{max}_M ~ 2.80 J kg^{-1} K^{-1}$ deduced from heat capacity and the corresponding adiabatic temperature change $ΔT_{ad} ~ 0.96 K$ with out-of-plane field change of 5 T. The critical analysis suggests that the ferromagnetic phase transition in $VI_3$ is situated close to a three- to two-dimensional critical point. The rescaled $ΔS_M (T, H)$ curves collapse onto a universal curve, confirming a second-order type of the magnetic transition and reliability of the obtained critical exponents.},
doi = {10.1103/PhysRevResearch.2.013013},
journal = {Physical Review Research},
number = 1,
volume = 2,
place = {United States},
year = {2020},
month = {1}
}
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https://doi.org/10.1103/PhysRevResearch.2.013013
https://doi.org/10.1103/PhysRevResearch.2.013013
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FIG. 1: (a) Single crystal x-ray diffraction (XRD) pattern ofVI3. Inset shows the ab plane structure and representative single crystal. (b) Refinement of synchrotron powder XRD data of Vl3 at room temperature.
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