Critical behavior of the van der Waals bonded ferromagnet Fe3-xGeTe2

Liu, Yu; Ivanovski, V. N.; Petrovic, C.

doi:10.1103/PhysRevB.96.144429

Title: Critical behavior of the van der Waals bonded ferromagnet ${Fe}_{3 - x} {GeTe}_{2}$

Journal Article · Sun Oct 29 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.144429· OSTI ID:1425051

Liu, Yu ^[1]; Ivanovski, V. N. ^[2]; Petrovic, C. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Belgrade (Serbia)

The critical properties of the single-crystalline van der Waals bonded ferromagnet Fe_3-xGeTe₂ were investigated by bulk dc magnetization around the paramagnetic to ferromagnetic (FM) phase transition. The Fe_3-xGeTe₂ single crystals grown by self-flux method with Fe deficiency x ≈ 0.36 exhibit bulk FM ordering below T_c = 152 K. The Mössbauer spectroscopy was used to provide information on defects and local atomic environment in such crystals. Critical exponents β = 0.372(4) with a critical temperature T_c= 151.25(5) K and γ = 1.265(15) with T_c = 151.17(12) K are obtained by the Kouvel-Fisher method, whereas δ = 4.50 ( 1 ) is obtained by a critical isotherm analysis at T_c = 151 K. These critical exponents obey the Widom scaling relation δ = 1 + γ / β , indicating self-consistency of the obtained values. With these critical exponents the isotherm M(H) curves below and above the critical temperatures collapse into two independent universal branches, obeying the single scaling equation m = f±(h), where m and h are renormalized magnetization and field, respectively. The exponents determined in this study are close to those calculated from the results of the renormalization group approach for a heuristic model of three-dimensional Heisenberg (d = 3,n = 3) spins coupled with the attractive long-range interactions between spins that decay as J(r) ≈ r^-(3+σ) with σ = 1.89.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1425051

Alternate ID(s):: OSTI ID: 1404741

Report Number(s):: BNL-114855-2017-JAAM; PRBMDO; TRN: US1802017

Journal Information:: Physical Review B, Vol. 96, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 54 works

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Hard magnetic properties in nanoflake van der Waals Fe3GeTe2 Tan, Cheng; Lee, Jinhwan; Jung, Soon-Gil Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-04018-w	journal	April 2018
Anisotropic magnetocaloric effect in Fe3−xGeTe2 Liu, Yu; Li, Jun; Tao, Jing Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-49654-4	journal	September 2019
Magnetic Properties of Proton Irradiated Mn3Si2Te6 van der Waals Single Crystals Martinez, L. M.; Saiz, C. L.; Cosio, A. MRS Advances, Vol. 4, Issue 40 https://doi.org/10.1557/adv.2019.260	journal	January 2019
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Hard magnetic properties in nanoflake van der Waals Fe3GeTe2 Tan, Cheng; Lee, Jinhwan; Jung, Soon-Gil arXiv https://doi.org/10.48550/arxiv.1803.02934	text	January 2018
Anisotropic magnetocaloric effect in Fe$_{3-x}$GeTe$_2$ Liu, Yu; Li, Jun; Tao, Jing arXiv https://doi.org/10.48550/arxiv.1904.03873	text	January 2019

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