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19 April 2024 |
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Article overview
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Structural and Physical Properties of CaFe4As3 Single Crystals | | A.B. Karki
; G.T. McCandless
; S. Stadler
; Y.M. Xiong
; J. Li
; Julia Y. Chan
; R. Jin
; | | Date: |
20 Mar 2011 | | Abstract: | We report the synthesis, and structural and physical properties of CaFe4As3
single crystals. Needle-like single crystals of CaFe4As3 were grown out of Sn
flux and the compound adopts an orthorhombic structure as determined by X-ray
diffraction measurements. Electrical, magnetic, and thermal properties indicate
that the system undergoes two successive phase transitions occurring at TN1 ~
90 K and TN2 ~ 26 K. At TN1, electrical resistivities (
ho(b) and
ho(ac))
are enhanced while magnetic susceptibilities (chi(b) and chi(ac)) are reduced
in both directions parallel and perpendicular to the b-axis, consistent with
the scenario of antiferromagnetic spin-density-wave formation. At TN2, specific
heat reveals a slope change, and chi(ac) decreases sharply but chi(b) has a
clear jump before it decreases again with decreasing temperature. Remarkably,
both
ho(b) and
ho(ac) decrease sharply with thermal hysteresis, indicating
the first-order nature of the phase transition at TN2. At low temperatures,
ho(b) and
ho(ac) can be described by {
ho} = {
ho}0 + AT^alpha ({
ho}0,
A, and {alpha} are constants). Interestingly, these constants vary with
applied magnetic field. The ground state of CaFe4As3 is discussed. | | Source: | arXiv, 1103.3852 | | Services: | Forum | Review | PDF | Favorites | |
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