Anisotropy and internal-field distribution of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>in the mixed state at low temperatures

Angst, Manuel; Castro, D. Di; Eshchenko, D. G.; Khasanov, R.; Kohout, S.; Savić, I. M.; Shengelaya, А.; Bud’ko, Sergey L.; Canfield, Paul C.; Jun, J.; Karpiński, J.; Казаков, С. М.; Ribeiro, R. A.; Keller, H.

doi:10.1103/physrevb.70.224513

Cited by 28 publications

(34 citation statements)

References 48 publications

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“…These are manifested in measurements of the ratios of the upper critical fields γ H = H ⊥c c2 /H c c2 for magnetic fields along the c−axis and the ab−plane and of the London penetration depth γ λ = λ c /λ ab . 1,2,3,4,5,6,7,8,9,10,11,12,13,14 The preponderance of experiments are in agreement with regard to the temperature dependence of γ H , which shows increase from γ H ≈ 2.0 around T c to γ H ≈ 6 at low temperatures. 6,7,14 However, the temperature dependence of γ λ , in particular under applied magnetic field, is not settled yet.…”

Section: Introductionsupporting

confidence: 67%

Magnetic-field-induced orientation of superconductingMgB2crystallites determined by x-ray diffraction

Vaknin

Bud’ko

et al. 2006

Phys. Rev. B

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X-ray diffraction studies of fine polycrystalline samples of MgB2 in the superconducting state reveal that crystals orient with their c-axis in a plane normal to the direction of the applied magnetic field. The MgB2 samples were thoroughly ground to obtain average grain size 5 -10 µm in order to increase the population of free single crystal grains in the powder. By monitoring Bragg reflections in a plane normal to an applied magnetic field we find that the powder is textured with significantly stronger (0,0,l ) reflections in comparison to (h,k,0 ), which remain essentially unchanged. The orientation of the crystals with the ab-plane parallel to the magnetic field at all temperatures below Tc demonstrates that the sign of the torque under magnetic field does not alter, in disagreement with current theoretical predictions.

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Section: Introductionsupporting

confidence: 67%

Magnetic-field-induced orientation of superconductingMgB2crystallites determined by x-ray diffraction

Vaknin

Bud’ko

et al. 2006

Phys. Rev. B

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“…An increase of the anisotropy with increasing field was found in MgB 2 (Ref. 54), whereas the anisotropy parameter was found to be field independent, at least up to 1.4 T, in the pnictides. 69 In both superconductors, mixing of two superconducting bands explains very well the field dependence of the anisotropy parameter and of the superfluid density.…”

Section: Resultsmentioning

confidence: 93%

Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdopedSmBa2Cu3Ox

et al. 2010

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The temperature dependence of the anisotropy of the superconducting state parameters, γ, was studied by torque magnetometry for the high temperature superconductor SmBa 2 Cu 3 O x in magnetic fields of up to 9 T. The measurements were performed on four underdoped single crystals with oxygen contents corresponding to T c 's varying from 42.8 to 63.6 K. The anisotropy was found to be strongly temperature dependent, while only a weak dependence on the magnetic field was observed. No evidence for a field dependent superfluid density was found. Possible origins of the temperature dependence of the anisotropy are discussed. PACS: 74.25.Bt, 74.25.Ha,

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“…In MgB 2 the field dependence of λ is explained by the fast suppression of the π band by the magnetic field (see e.g. [30]). Thus, the observation of nearly the same temperature dependences of λ measured in different fields is an additional argument pointing to the conventional character of superconductivity in RbOs 2 O 6 .…”

Section: Resultsmentioning

confidence: 99%

Magnetic penetration depth inRbOs2O6studied by muon spin rotation

et al. 2005

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Measurements of the magnetic field penetration depth λ in the pyrochlore superconductor RbOs2O6 (Tc ≃ 6.3 K) were carried out by means of the muon-spin-rotation (µSR) technique. At low temperatures λ −2 (T ) saturates and becomes constant below T ≃ 0.2Tc, in agreement with what is expected for weak-coupled s-wave BCS superconductors. The value of λ at T = 0 was found to be in the range of 250 nm to 300 nm. µSR and equilibrium magnetization measurements both reveal that at low temperatures λ is almost (at the level of 10%) independent of the applied magnetic field. This result suggests that the superconducting energy gap in RbOs2O6 is isotropic.

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Anisotropy and internal-field distribution ofMgB2in the mixed state at low temperatures

Cited by 28 publications

References 48 publications

Magnetic-field-induced orientation of superconductingMgB2crystallites determined by x-ray diffraction

Magnetic-field-induced orientation of superconductingMgB2crystallites determined by x-ray diffraction

Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdopedSmBa2Cu3Ox

Magnetic penetration depth inRbOs2O6studied by muon spin rotation

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