Contamination from magnetic starting materials in flux-grown single crystals of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi></mml:mrow></mml:math>FeAsO superconductors

Yan, Jiaqiang; Xing, Q.; Jensen, Brandt; Xu, Huashan; Dennis, K. W.; McCallum, R. W.; Lograsso, Thomas A.

doi:10.1103/physrevb.84.012501

Cited by 6 publications

(8 citation statements)

References 14 publications

(16 reference statements)

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“…The nearly temperature independent magnetic susceptibility below T N = 24 K suggests that the magnetic impurities of Bi 2−x Mn x Te 3 tend to stay on the edges of the crystals. This is similar to the contamination of NdFeAsO single crystals by NdAs we observed before [14]. Therefore, before magnetic measurements, we carefully cleaned the crystals by removing the edges using a surgical blade.…”

Section: A Magnetic and Transport Propertiessupporting

confidence: 61%

Crystal growth and magnetic structure of MnBi2Te4

Yan

Zhang

Heitmann

et al. 2019

Phys. Rev. Materials

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311

237

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Millimeter-sized MnBi2Te4 single crystals are grown out of a BiTe flux and characterized using magnetic, transport, scanning tunneling microscopy, and spectroscopy measurements. The magnetic structure of MnBi2Te4 below TN is determined by powder and single-crystal neutron diffraction measurements. Below TN = 24 K, Mn2+ moments order ferromagnetically in the ab plane but antiferromagnetically along the crystallographic c axis. The ordered moment is 4.04(13)μB/Mn at 10 K and aligned along the crystallographic c axis in an A-type antiferromagnetic order. Below TN, the electrical resistivity drops upon cooling or when going across the metamagnetic transition in increasing magnetic fields. A critical scattering effect is observed in the vicinity of TN in the temperature dependence of thermal conductivity, indicating strong spin-lattice coupling in this compound. However, no anomaly is observed in the temperature dependence of thermopower around TN. Fine tuning of the magnetism and/or electronic band structure is needed for the proposed topological properties of this compound. The growth protocol reported in this work might be applied to grow high-quality crystals where the electronic band structure and magnetism can be finely tuned by chemical substitutions.

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Section: A Magnetic and Transport Propertiessupporting

confidence: 61%

Crystal growth and magnetic structure of MnBi2Te4

Yan

Zhang

Heitmann

et al. 2019

Phys. Rev. Materials

Self Cite

311

237

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show abstract

“…This is similar to the contamination of Nd-FeAsO single crystals by NdAs we observed before. [13] Therefore, before magnetic measurements, we carefully cleaned the crystals by removing the edges using a surgical blade.…”

Section: Magnetic and Transport Propertiesmentioning

confidence: 99%

Crystal growth and magnetic structure of MnBi2Te4

Yan,

Zhang,

Heitmann

et al. 2019

Preprint

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Millimeter-sized MnBi2Te4 single crystals are grown out of a Bi-Te flux and characterized using magnetic, transport, scanning tunneling microscopy and spectroscopy measurements. The magnetic structure of MnBi2Te4 below TN is determined by powder and single crystal neutron diffraction measurements. Below TN =24 K, Mn 2+ moments order ferromagnetically in the ab-plane but antiferromagnetically along the crystallographic c-axis. The ordered moment is 4.04(13)µB/Mn at 10 K and aligned along the crystallographic c-axis in an A-type antiferromagnetic order. The electrical resistivity drops upon cooling across TN or when going across the metamagnetic transition in increasing magnetic fields below TN . A critical scattering effect is observed in the vicinity of TN in the temperature dependence of thermal conductivity. However, a linear temperature dependence is observed for the thermopower in the temperature range 2 K≤T≤300 K without any anomaly around TN . Fine tuning of the magnetism and/or electronic band structure is needed for the proposed topological properties of this compound. The growth protocol reported in this work might be applied to grow high quality crystals where the electronic band structure and magnetism can be finely tuned by chemical substitutions.

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“…Thus, one can conclude that the 1111 phase formation is much easier in molten salts than that in NaAs and KAs. Therefore, it is not surprising that doping control and obtaining high T c superconductors through substituting of F for O is very difficult not only at ambient pressure [11][12][13] but also under HPHT crystal growth conditions. The synthesis temperature is the second very important parameter since once it exceeds 1450 °C, the 1111-type phase tends to decompose into various phases, such as LnAs, Ref.…”

Section: A Crystal Growthmentioning

confidence: 99%

“…However, as many groups have proved through trial and error [1][2][3][4][5][6][7][8][9][10][11][12][13], the crystal growth of LnFePnO (Ln1111, Ln: lanthanide, Pn: pnictogen) oxypnictides is a difficult task. A number of exciting features with respect to structural, electronic, magnetic, and superconducting properties are still unresolved or have not been adequately studied yet.…”

Section: Introductionmentioning

confidence: 99%

High-pressure flux growth, structural, and superconducting properties ofLnFeAsO (Ln=Pr, Nd, Sm) single cryst

et al. 2012

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Single-crystals of the LnFeAsO (Ln1111, Ln = Pr, Nd, and Sm) family with lateral dimensions up to 1 mm were grown from NaAs and KAs flux at high pressure. The crystals are of good structural quality and become superconducting when O is partially substituted by F (PrFeAsO 1-x F x and NdFeAsO 1-x F x ) or when Fe is substituted by Co (SmFe 1-x Co x AsO).From magnetization measurements, we estimate the temperature dependence and anisotropy of the upper critical field and the critical current density of underdoped PrFeAsO 0.7 F 0.3 crystal with T c ≈ 25 K. Single crystals of SmFe 1-x Co x AsO with maximal T c up to 16.3 K for x ≈ 0.08 were grown for the first time. From transport and magnetic measurements we estimate the critical fields and their anisotropy, and find these superconducting properties to be quite comparable to the ones in SmFeAsO 1-x F x with a much higher T c of ≈ 50 K. The magnetically measured critical current densities are as high as 10 9 A/m 2 at 2 K up to 7 T, with indication of the usual "fishtail" effect. The upper critical field estimated from resistivity measurements is anisotropic with slopes of ∼ -8.7 T/K (H || ab-plane) and ∼ -1.7 T/K (H || c-axis). This anisotropy (∼ 5) is similar to that in other Ln1111 crystals with various higher T c 's.

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Contamination from magnetic starting materials in flux-grown single crystals ofRFeAsO superconductors

Cited by 6 publications

References 14 publications

Crystal growth and magnetic structure of MnBi2Te4

Crystal growth and magnetic structure of MnBi2Te4

Crystal growth and magnetic structure of MnBi2Te4

High-pressure flux growth, structural, and superconducting properties ofLnFeAsO (Ln=Pr, Nd, Sm) single cryst

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