1. State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China 2. Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China 3. Materials Research Center for Element Strategy, Tokyo Institute of Technology (MCES), Yokohama, Kanagawa 226-8503, Japan 4. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
We study the magnetocaloric effect (MCE) in van der Waals (vdW) crystal CrBr3. Bulk CrBr3 exhibits a second-order paramagnetic-ferromagnetic phase transition with TC = 33 K. The maximum magnetic entropy change −ΔSM near TC is about 7.2 J·kg−1·K−1 with the maximum adiabatic temperature change ΔTmaxad = 2.37 K and the relative cooling power RCP= 191.5 J·kg−1 at μ0H = 5 T, all of which are remarkably larger than those in CrI3. These results suggest that the vdW crystal CrBr3 is a promising candidate for the low-dimensional magnetic refrigeration in low temperature region.
K. S. Novoselov, A. Mishchenko, A. Carvalho, and A. H. Castro Neto, 2D materials and van der Waals heterostructures, Science 353(6298), 461 (2016) https://doi.org/10.1126/science.aac9439
2
K. F. Mak, C. Lee, J. Hone, J. Shan, and T. F. Heinz, Atomically thin MoS2: A new direct-gap semiconductor, Phys. Rev. Lett. 105(13), 136805 (2010) https://doi.org/10.1103/PhysRevLett.105.136805
3
B. Huang, G. Clark, E. Navarro-Moratalla, D. R. Klein, R. Cheng, K. L. Seyler, D. Zhong, E. Schmidgall, M. A. McGuire, D. H. Cobden, W. Yao, D. Xiao, P. Jarillo-Herrero, and X. Xu, Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit, Nature 546(7657), 270 (2017) https://doi.org/10.1038/nature22391
4
M. A. McGuire, G. Clark, S. Kc, W. M. Chance, G. E. Jellison, V. R. Cooper, X. Xu, and B. C. Sales, Magnetic behavior and spin-lattice coupling in cleavable van der Waals layered CrCl3 crystals, Phys. Rev. Mater. 1(1), 014001 (2017) https://doi.org/10.1103/PhysRevMaterials.1.014001
5
M. A. McGuire, H. Dixit, V. R. Cooper, and B. C. Sales, Coupling of crystal structure and magnetism in the layered, ferromagnetic insulator CrI3, Chem. Mater. 27(2), 612 (2015) https://doi.org/10.1021/cm504242t
V. Y. Verchenko, A. A. Tsirlin, A. V. Sobolev, I. A. Presniakov, and A. V. Shevelkov, Ferromagnetic order, strong magnetocrystalline anisotropy, and magnetocaloric effect in the layered telluride Fe3−dGeTe2, Inorg. Chem. 54(17), 8598 (2015) https://doi.org/10.1021/acs.inorgchem.5b01260
X. Zhang, S. Matsuishi, and H. Hosono, Critical behavior and magnetocaloric effect in layered structure Tb2C, J. Phys. D 49(33), 335002 (2016) https://doi.org/10.1088/0022-3727/49/33/335002
11
V. K. Pecharsky and K. A. Jr Gschneidner, Magnetocaloric effect from indirect measurements: Magnetization and heat capacity, J. Appl. Phys. 86(1), 565 (1999) https://doi.org/10.1063/1.370767
V. Franco, J. S. Blázquez, and A. Conde, Field dependence of the magnetocaloric effect in materials with a second order phase transition: A master curve for the magnetic entropy change, Appl. Phys. Lett. 89(22), 222512 (2006) https://doi.org/10.1063/1.2399361
14
V. Franco and A. Conde, Scaling laws for the magnetocaloric effect in second order phase transitions: From physics to applications for the characterization of materials, Int. J. Refrig. 33(3), 465 (2010) https://doi.org/10.1016/j.ijrefrig.2009.12.019
15
H. Oesterreicher and F. T. Parker, Magnetic cooling near Curie temperatures above 300 K, J. Appl. Phys. 55(12), 4334 (1984) https://doi.org/10.1063/1.333046
16
K. A. Jr Gschneidner, V. K. Pecharsky, and A. O. Tsokol, Recent developments in magnetocaloric materials, Rep. Prog. Phys. 68(6), 1479 (2005) https://doi.org/10.1088/0034-4885/68/6/R04
17
B. G. Shen, J. R. Sun, F. X. Hu, H. W. Zhang, and Z. H. Cheng, Recent progress in exploring magnetocaloric materials, Adv. Mater. 21(45), 4545 (2009) https://doi.org/10.1002/adma.200901072
18
B. Huang, G. Clark, D. R. Klein, D. MacNeill, E. Navarro-Moratalla, K. L. Seyler, and N. Wilson, M. A. M-cGuire, D. H. Cobden, D. Xiao, W. Yao, P. Jarillo-Herrero, and X. Xu, Electrical control of 2D magnetism in bilayer CrI3, Nat. Nanotech. 13, 544 (2018) https://doi.org/10.1038/s41565-018-0121-3
19
S. Jiang, L. Li, Z. Wang, K. F. Mak, and J. Shan, Controlling magnetism in 2D CrI3 by electrostatic doping, Nat. Nanotech. 13(7), 549 (2018) https://doi.org/10.1038/s41565-018-0135-x
20
Y. Deng, Y. Yu, Y. Song, J. Zhang, N. Z. Wang, Y. Z. Wu, J. Zhu, J. Wang, X. H. Chen, and Y. Zhang, Gate-tunable room-temperature ferromagnetism in twodimensional Fe3GeTe2, arXiv: 1803.02038 (2018)