The critical magnetic field of anisotropic two-band magnetic superconductors

Changjan, Arpapong; Udomsamuthirun, P.

doi:10.1016/j.ssc.2011.04.032

Cited by 15 publications

(13 citation statements)

References 35 publications

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“…In spite of the natural observations of three gaps, less is known for other thermodynamic properties. In this context the interpretation of experimental upper critical field data in terms of multiband models beyond single-band strong coupling theories [12] and two-band model approximations [13][14][15][16][17][18][19][20][21][22][23] is highly desirable. From a theoretical point of view, the possibility of an unusual broken time-reversal symmetry and accompanying frustration phenomena for the ground states of systems with odd-numbered bands and repulsive interband couplings between them has been attracted considerable attention [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Ginzburg-Landau Analysis of the Critical Temperature and the Upper Critical Field for Three-Band Superconductors

2013

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Using the microscopic formalism of Eilenberger equations, a three-band Ginzburg-Landau theory for the intraband dirty limit and clean interband scattering case is derived. Within the framework of this three-band Ginzburg-Landau theory, expressions for the critical temperature T c and the temperature dependence of the upper critical field 2 c H are obtained. Based on some special cases of the matrix of interaction constants, we demonstrate the influence of the sign of the interband interaction on the critical temperature and the upper critical field as compared with a two-band superconductor where it plays no role. We study also analytically and numerically the effect of its magnitude.

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Section: Introductionmentioning

confidence: 99%

Ginzburg-Landau Analysis of the Critical Temperature and the Upper Critical Field for Three-Band Superconductors

2013

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“…This fit obviously underestimates the values of Hc2, and it doesn't reflect the positive upturn that becomes more noticeable at lower temperatures. The positive curvature of Hc2(T) has been addressed in theoretical and empirical models consistent with a two-band scenario, and the Ginzburg-Landau (GL) theory [18][19][20]. For instance [18],…”

Section: Resultsmentioning

confidence: 99%

“…The positive curvature of Hc2(T) has been addressed in theoretical and empirical models consistent with a two-band scenario, and the Ginzburg-Landau (GL) theory [18][19][20]. For instance [18],…”

Section: Resultsmentioning

confidence: 99%

Possible multiband superconductivity in the quaternary carbide YRe₂SiC

Faria

Ferreira

Corrêa

et al. 2021

Supercond. Sci. Technol.

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We report for the first time the occurrence of superconductivity in the quaternary silicide carbide YRe2SiC with Tc ≈ 5.9 K. The emergence of superconductivity was confirmed by means of magnetic susceptibility, electrical resistivity, and heat capacity measurements. The presence of a well developed heat capacity feature at Tc confirms that superconductivity is a bulk phenomenon, while a second feature in the heat capacity near 0.5 Tc combined with the unusual temperature dependence of the upper critical field Hc2(T) indicate the presence of a multiband superconducting state. Additionally, the linear dependence of the lower critical field Hc1 with temperature resemble the behavior found in compounds with unconventional pairing symmetry. Band structure calculations reveal YRe2SiC could harbor a non-trivial topological state and that the low-energy states occupy multiple disconnected sheets at the Fermi surface, with different degrees of hybridization, nesting, and screening effects, therefore making unconventional multiband superconductivity plausible.

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“…which is an empirical description appropriate to anisotropic two-band superconductors [51]. Fit (2) T and 2.04 (3) T for x = 0, 0.1, 0.3 and 0.7, respectively.…”

Section: Critical Fieldsmentioning

confidence: 99%

Broken time-reversal symmetry in superconducting Pr$_{1-x}$La$_{x}$Pt$_{4}$Ge$_{12}$

Zhang,

Ding,

Huang

et al. 2019

Preprint

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The superconducting state of the filled skutterudite alloy series Pr 1−x La x Pt 4 Ge 12 has been systematically studied by specific heat, zero-field muon spin relaxation (µSR), and superconducting critical field measurements. An additional inhomogeneous local magnetic field, indicative of broken time-reversal symmetry (TRS), is observed in the superconducting states of the alloys. For x 0.5 the broken-TRS phase sets in below a temperature T m distinctly lower than the superconducting transition temperature T c . For x 0.5 T m ≈ T c . The local field strength decreases as x → 1, where LaPt 4 Ge 12 is characterized by conventional pairing. The lower critical field H c1 (T ) of PrPt 4 Ge 12 shows the onset of a second quadratic temperature region below T q ∼ T m . Upper critical field H c2 (T ) measurements suggest multiband superconductivity, and point gap nodes are consistent with the specific heat data. In Pr 1−x La x Pt 4 Ge 12 only a single specific heat discontinuity is observed at T c , in contrast to the second jump seen in PrOs 4 Sb 12 below T c . These results suggest that superconductivity in PrPt 4 Ge 12 is characterized by a complex order parameter.

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The critical magnetic field of anisotropic two-band magnetic superconductors

Cited by 15 publications

References 35 publications

Ginzburg-Landau Analysis of the Critical Temperature and the Upper Critical Field for Three-Band Superconductors

Ginzburg-Landau Analysis of the Critical Temperature and the Upper Critical Field for Three-Band Superconductors

Possible multiband superconductivity in the quaternary carbide YRe₂SiC

Broken time-reversal symmetry in superconducting Pr$_{1-x}$La$_{x}$Pt$_{4}$Ge$_{12}$

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The critical magnetic field of anisotropic two-band magnetic superconductors

Cited by 15 publications

References 35 publications

Ginzburg-Landau Analysis of the Critical Temperature and the Upper Critical Field for Three-Band Superconductors

Ginzburg-Landau Analysis of the Critical Temperature and the Upper Critical Field for Three-Band Superconductors

Possible multiband superconductivity in the quaternary carbide YRe2SiC

Broken time-reversal symmetry in superconducting Pr$_{1-x}$La$_{x}$Pt$_{4}$Ge$_{12}$

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Possible multiband superconductivity in the quaternary carbide YRe₂SiC