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- W4377041763 startingPage "035001" @default.
- W4377041763 abstract "Abstract We report on the synthesis of LiCrTe <?CDATA $_{textrm{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi /> <mml:mrow> <mml:mrow> <mml:mtext>2</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:math> single crystals and on their anisotropic magnetic properties. We have obtained these single crystals by employing a Te/Li-flux synthesis method. We find LiCrTe <?CDATA $_{textrm{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi /> <mml:mrow> <mml:mrow> <mml:mtext>2</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:math> to crystallize in a TlCdS <?CDATA $_{textrm{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi /> <mml:mrow> <mml:mrow> <mml:mtext>2</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:math> -type structure with cell parameters of a = 3.9512(5) Å and c = 6.6196(7) Å at T = 175 K. The content of lithium in these crystals was determined to be neary stoichiometric by means of neutron diffraction. We find a pronounced magnetic transition at <?CDATA $T^{mathrm{{,}ab}}_{mathrm{N}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mi>T</mml:mi> <mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mrow> <mml:mrow /> <mml:mi mathvariant=normal>a</mml:mi> <mml:mi mathvariant=normal>b</mml:mi> </mml:mrow> </mml:mrow> </mml:msubsup> </mml:math> = 144 K and <?CDATA $T^{mathrm{{,}c}}_{mathrm{N}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mi>T</mml:mi> <mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> </mml:mrow> <mml:mrow> <mml:mrow> <mml:mrow /> <mml:mi mathvariant=normal>c</mml:mi> </mml:mrow> </mml:mrow> </mml:msubsup> </mml:math> = 148 K, respectively. These transition temperatures are substantially higher than earlier reports on polycrystalline samples. We have performed neutron powder diffraction measurements that reveal that the long-range low-temperature magnetic structure of single crystalline LiCrTe <?CDATA $_{textrm{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi /> <mml:mrow> <mml:mrow> <mml:mtext>2</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:math> is an A-type antiferromagnetic structure. Our DFT calculations are in good agreement with these experimental observations. We find the system to be easy axis with moments oriented along the c -direction experimentally as well as in our calculations. Thereby, the magnetic Hamiltonian can be written as <?CDATA $H = H_{mathrm{Heisenberg}} + sum_i K_c (S_i^z)^2$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>H</mml:mi> <mml:mo>=</mml:mo> <mml:msub> <mml:mi>H</mml:mi> <mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>H</mml:mi> <mml:mi mathvariant=normal>e</mml:mi> <mml:mi mathvariant=normal>i</mml:mi> <mml:mi mathvariant=normal>s</mml:mi> <mml:mi mathvariant=normal>e</mml:mi> <mml:mi mathvariant=normal>n</mml:mi> <mml:mi mathvariant=normal>b</mml:mi> <mml:mi mathvariant=normal>e</mml:mi> <mml:mi mathvariant=normal>r</mml:mi> <mml:mi mathvariant=normal>g</mml:mi> </mml:mrow> </mml:mrow> </mml:msub> <mml:mo>+</mml:mo> <mml:mrow> <mml:munder> <mml:mo>∑</mml:mo> <mml:mi>i</mml:mi> </mml:munder> </mml:mrow> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>c</mml:mi> </mml:msub> <mml:mo stretchy=false>(</mml:mo> <mml:msubsup> <mml:mi>S</mml:mi> <mml:mi>i</mml:mi> <mml:mi>z</mml:mi> </mml:msubsup> <mml:mrow> <mml:msup> <mml:mo stretchy=false>)</mml:mo> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> with <?CDATA $K_c = -0.34$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>c</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mo>−</mml:mo> <mml:mn>0.34</mml:mn> </mml:math> K (where <?CDATA $|S^z| = frac{3}{2}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:msup> <mml:mi>S</mml:mi> <mml:mi>z</mml:mi> </mml:msup> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:mo>=</mml:mo> <mml:mfrac> <mml:mn>3</mml:mn> <mml:mn>2</mml:mn> </mml:mfrac> </mml:math> ). We find LiCrTe <?CDATA $_{textrm{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi /> <mml:mrow> <mml:mrow> <mml:mtext>2</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:math> to be highly anisotropic, with a pronounced metamagnetic transition for <?CDATA $H perp ab$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>H</mml:mi> <mml:mo>⊥</mml:mo> <mml:mi>a</mml:mi> <mml:mi>b</mml:mi> </mml:math> with a critical field of <?CDATA $mu H_{MM}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>μ</mml:mi> <mml:msub> <mml:mi>H</mml:mi> <mml:mrow> <mml:mi>M</mml:mi> <mml:mi>M</mml:mi> </mml:mrow> </mml:msub> </mml:math> (5 K) ≈ 2.5 T. Using detailed orientation-dependent magnetization measurements, we have determined the magnetic phase diagram of this material. Our findings suggest that LiCrTe <?CDATA $_{textrm{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi /> <mml:mrow> <mml:mrow> <mml:mtext>2</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:math> is a promising material for exploring the interplay between crystal structure and magnetism, and could have potential applications in spin-based 2D devices." @default.
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- W4377041763 date "2023-05-17" @default.
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- W4377041763 title "Synthesis and anisotropic magnetic properties of LiCrTe 2 single crystals with a triangular-lattice antiferromagnetic structure" @default.
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