High Magnetic Anisotropy and Magnetocaloric Effects in Single-Crystal Cr2Te3

Goswami, Anirban; Ng, Nicholas; Abeykoon, AM Milinda; Yakubu, Emmanuel; Guchhait, Samaresh

doi:10.1021/acsaelm.4c00009

High Magnetic Anisotropy and Magnetocaloric Effects in Single-Crystal Cr₂Te₃

Journal Article · Fri May 24 00:00:00 EDT 2024 · ACS Applied Electronic Materials

DOI:https://doi.org/10.1021/acsaelm.4c00009· OSTI ID:2460437

^[1]; Ng, Nicholas ^[2]; Abeykoon, AM Milinda ^[3]; Yakubu, Emmanuel ^[1]; Guchhait, Samaresh ^[1]

Howard Univ., Washington, DC (United States)
Johns Hopkins Univ., Baltimore, MD (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Here, we report a systematic investigation of anisotropic magnetocaloric effects in single-crystal Cr₂Te₃. Single-crystal samples are synthesized by chemical vapor transport and characterized by X-ray and Laue diffraction methods. The maximum magnetic entropy change –ΔS_M^max is 4.50 J kg^–1 K^–1 for the easy c-axis (3.36 J kg^–1 K^–1 for the hard axis along ab-plane), and the relative cooling power (RCP) is 296.7 J kg^–1 for the easy c-axis (183.84 J kg^–1 for the hard axis along ab-plane) for a magnetic field change of 9 T near the Curie temperature. The magneto-crystalline anisotropy constant K_u is estimated to be 580.12 kJ m^–3 at 140 K, decreasing to 148.60 kJ m^–3 at 168 K. Meanwhile, the maximum of the rotational magnetic entropy change –ΔS_M^R(T, H) between the c-axis and the ab-plane is about 1.14 J kg^–1 K^–1 for magnetic-field change of 9 T. The critical exponents are estimated by analyzing magnetocaloric effects, which indicate a 2D-Ising type magnetic system. The accuracy of estimated critical exponents is verified by scaling analysis. The maximum magnetic entropy change –ΔS_M^max ≈ 5.25 J kg^–1 K^–1 (along the c-axis) and the corresponding adiabatic temperature change ΔT_ad ≈ 3.31 K (along the c-axis) are estimated by analyzing heat capacity measurements with a magnetic field up to 9 T.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2460437

Report Number(s):: BNL--226218-2024-JAAM

Journal Information:: ACS Applied Electronic Materials, Journal Name: ACS Applied Electronic Materials Journal Issue: 6 Vol. 6; ISSN 2637-6113

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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anisotropic magnetocaloric effects
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