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

Journal Article · · Physical Review B
 [1];  [2];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. of Belgrade (Serbia)

The critical properties of the single-crystalline van der Waals bonded ferromagnet Fe3-xGeTe2 were investigated by bulk dc magnetization around the paramagnetic to ferromagnetic (FM) phase transition. The Fe3-xGeTe2 single crystals grown by self-flux method with Fe deficiency x ≈ 0.36 exhibit bulk FM ordering below Tc = 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 Tc= 151.25(5) K and γ = 1.265(15) with Tc = 151.17(12) K are obtained by the Kouvel-Fisher method, whereas δ = 4.50 ( 1 ) is obtained by a critical isotherm analysis at Tc = 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1425051
Report Number(s):
BNL-114855-2017-JAAM
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 96; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Hard magnetic properties in nanoflake van der Waals Fe3GeTe2 journal April 2018
Anisotropic magnetocaloric effect in Fe3−xGeTe2 journal September 2019
Critical properties of the quasi-two-dimensional metallic ferromagnet Fe 2.85 GeTe 2 journal August 2018
Field-dependent anisotropic magnetic coupling in layered ferromagnetic Fe 3 − x GeTe 2 journal September 2019
Angular dependence of the topological Hall effect in the uniaxial van der Waals ferromagnet Fe 3 GeTe 2 journal October 2019
Critical behavior of intercalated quasi-van der Waals ferromagnet F e 0.26 Ta S 2 journal November 2019
Magnetic Properties of Proton Irradiated Mn3Si2Te6 van der Waals Single Crystals journal January 2019
Magnetic Properties of Proton Irradiated Fe2.7GeTe2 Bulk Crystals journal January 2019
Hard magnetic properties in nanoflake van der Waals Fe3GeTe2 text January 2018
Anisotropic magnetocaloric effect in Fe$_{3-x}$GeTe$_2$ text January 2019

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