Investigation of UBe13 and other beryllium and uranium compounds in normal and superconducting states

Alekseevskiǐ, N. E.; Nizhankovskii, V. I.; Narozhnyi, V. N.; Хлыбов, Е. П.; Mitin, A. V.

doi:10.1007/bf00681544

Cited by 27 publications

(7 citation statements)

References 14 publications

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“…56 In this model, at low fields, the light carriers with high mobilities give the prevalent contribution to the Hall effect, whereas at high fields the contribution of the heavier carriers having lower mobilities is more significant. Very recently a similar two-band model 57 has been used to interpret the results on the transport properties of Nd 2−x Ce x CuO 4 epitaxial thin films.…”

Section: B Normal State Hall Effectmentioning

confidence: 89%

Hall effect inLuNi2B2Cand<

et al. 1999

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The Hall effect in LuNi2B2C and YNi2B2C borocarbides has been investigated in normal and superconducting mixed states. The Hall resistivity ρxy for both compounds is negative in the normal as well as in the mixed state and has no sign reversal below Tc typical for high-Tc superconductors. In the mixed state the behavior of both systems is quite similar. The scaling relation ρxy ∼ ρ β xx (ρxx is the longitudinal resistivity) was found with β = 2.0 and 2.1 for annealed Luand Y-based compounds, respectively. The scaling exponent β decreases with increasing degree of disorder and can be varied by annealing. This is attributed to a variation of the strength of flux pinning. In the normal state weakly temperature dependent Hall coefficients were observed for both compounds. A distinct nonlinearity in the ρxy dependence on field H was found for LuNi2B2C in the normal state below 40 K, accompanied by a large magnetoresistance (MR) reaching +90% for H = 160 kOe at T = 20 K. At the same time for YNi2B2C only linear ρxy(H) dependences were observed in the normal state with an approximately three times lower MR value. This difference in the normal state behavior of the very similar Lu-and Y-based borocarbides seems to be connected with the difference in the topology of the Fermi surface of these compounds.

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Section: B Normal State Hall Effectmentioning

confidence: 89%

Hall effect inLuNi2B2Cand<

et al. 1999

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“…It was claimed that one part of the Fermi surface is a cylinder along the c-axis [5], so open orbits can be expected for H⊥c.) It is well known [31] [28].) A nonlinear ρ xy (H) dependence can also be obtained within the two-band model used, e.g., to interpret the nonlinear and even nonmonotonous ρ xy (H) dependence for UB 13 [28].…”

Section: Investigations Of the Hall Effect In The Normal And Superconmentioning

confidence: 99%

Hall-effect in LuNi2B2C in normal and superconducting mixed states

Narozhnyi

Freudenberger

Кочетков

et al. 1999

Solid State Communications

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The Hall resistivity ρ xy of LuNi 2 B 2 C is negative in the normal as well as in the mixed state and has no sign reversal typical for high-T c superconductors. A distinct nonlinearity in the ρ xy dependence on field H was found in the normal state for T < ∼ 40 K, accompanied by a large magnetoresistance reaching +90%for µ 0 H = 16 T at T = 20 K. The scaling relation ρ xy ∼ ρ β xx (ρ xx is the longitudinal resistivity) was found in the mixed state, the value of β being dependent on the degree of disorder.

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“…UBe 13 crystallizes in the cubic NaZn 13 structure type (space group ) with the reported lattice parameter a = 10.254 Å (Fig. 1) 7,8 . Uranium at 8 a site (1/4, 1/4, 1/4) is coordinated by 24 Be2 atoms at 96 i site (0, 0.1763(1), 0.1150(1)).…”

Section: Introductionmentioning

confidence: 99%

“…S1) 49–51 . The lattice parameter a is reported to range from a = 10.254 Å to 10.2656 Å and the critical temperature from T c = 0.35 K to 0.94 K 8,49,52 . Furthermore, a tends to be larger and T c tends to be lower in single crystals, compared to polycrystalline samples.…”

Section: Introductionmentioning

confidence: 99%

Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe13

Amon

Zelenina

Simon

et al. 2018

Sci Rep

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The influence of Al incorporation on the heavy fermion superconductor UBe13 was investigated to explain the sample dependence of physical properties. Clear evidence for incorporated Al in flux-grown UBe13 single crystals is presented by results from X-ray diffraction, nuclear magnetic resonance and X-ray spectroscopy. The increase of the lattice parameter and the concomitant change of the superconducting properties are caused by substitution of Be in the compound by 1–2 at.% Al. The minute amounts of Al in the structure were located by atomic resolution transmission electron microscopy. Specific heat measurements reveal the strong influence of incorporated Al on the physical properties of UBe13. Upon long-term annealing, Al incorporated in single crystals can leave the structure, restoring properties of Al-free polycrystalline UBe13.

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Investigation of UBe13 and other beryllium and uranium compounds in normal and superconducting states

Cited by 27 publications

References 14 publications

Hall effect inLuNi2B2Cand<

Hall effect inLuNi2B2Cand<

Hall-effect in LuNi2B2C in normal and superconducting mixed states

Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe13

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