Self-consistent localization theory in magnetic fields and the upper critical field of disordered superconductors

1991 ◽  
Vol 3 (21) ◽  
pp. 3765-3775 ◽  
Author(s):  
A Theumann ◽  
M A P Idiart
Keyword(s):  
Magnetic Fields ◽  
Critical Field ◽  
Upper Critical Field ◽  
Localization Theory ◽  
Self Consistent ◽  
Disordered Superconductors

Upper critical field of κ-(ET)2Cu[N(CN)2]Br under parallel magnetic fields

2001 ◽  
Vol 294-295 ◽  
pp. 427-430 ◽  
Author(s):  
Y. Shimojo ◽  
A.E. Kovalev ◽  
S. Kamiya ◽  
E. Ohmichi ◽  
T. Ishiguro ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Critical Field ◽  
Upper Critical Field ◽  
Parallel Magnetic Fields

Field Anisotropy of the Pseudogap State in Bi2Sr2CaCu2O8+y Ultrahigh Magnetic Fields

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3598-3603 ◽  
Author(s):  
L. Krusin-Elbaum ◽  
T. Shibauchi ◽  
C. H. Mielke
Keyword(s):  
Magnetic Fields ◽  
Critical Field ◽  
Orbital Motion ◽  
Upper Critical Field ◽  
Large Field ◽  
Cooper Pairs ◽  
Spin Channel ◽  
Pseudogap State ◽  
Ultrahigh Magnetic Fields ◽  
Small Anisotropy

The orientational anisotropy of the pseudogap closing field Hpg is investigated in magnetic fields up to 60 T applied parallel (||ab) and normal (||c) to CuO 2 planes in Bi 2 Sr 2 CaCu 2 O 8+y. We find that, in contrast to large field anisotropy related to the orbital motion of Cooper pairs below the upper critical field Hc2, the temperature-independent and small anisotropy of Hpg is due to anisotropy of the g-factor: [Formula: see text], indicating correlations only in the spin-channel.

Resistive upper critical field ofTl2Ba2CuO6at low temperatures and high magnetic fields

1993 ◽  
Vol 71 (8) ◽  
pp. 1238-1241 ◽  
Author(s):  
A. P. Mackenzie ◽  
S. R. Julian ◽  
G. G. Lonzarich ◽  
A. Carrington ◽  
S. D. Hughes ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Critical Field ◽  
Low Temperatures ◽  
Upper Critical Field ◽  
High Magnetic Fields

TRANSPORT ANISOTROPY IN ErNi2B2C ALONG c-AXIS

2010 ◽  
Vol 24 (30) ◽  
pp. 5861-5866
Author(s):  
W. C. LEE
Keyword(s):  
Magnetic Fields ◽  
Temperature Dependence ◽  
Field Dependence ◽  
Critical Field ◽  
Upper Critical Field ◽  
Pair Breaking ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Anisotropic Field ◽  
Magnetic Pair

The resistivities along c-axis ρc(H, T) of ErNi 2 B 2 C have been measured with H⊥ and H‖c-axis for 2 < T < 300 K and the superconducting upper critical field Hc2(T) curves of ErNi 2 B 2 C were constructed for each magnetic fields. Our Hc2(T) curves have been compared and discussed with those from ρab(H, T) measurements which explain the anisotropy and its temperature dependence of Hc2(T) are thought to arise from magnetic pair breaking and the anisotropic field dependence of Néel temperature TN originated from Er +3 sublattice.

scholarly journals Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
I. F. Llovo ◽  
C. Carballeira ◽  
D. Sóñora ◽  
A. Pereiro ◽  
J. J. Ponte ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Angular Dependence ◽  
Critical Field ◽  
Upper Critical Field ◽  
Single Band ◽  
Band Model ◽  
Cooper Pairs ◽  
Ginzburg Landau ◽  
Superconducting Fluctuations

AbstractDetailed measurements of the in-plane resistivity were performed in a high-quality Ba($$\hbox {Fe}_{1-x}\hbox {Co}_{{x}}$$ Fe 1 - x Co x )$$_2\hbox {As}_2$$ 2 As 2 ($$x=0.065$$ x = 0.065 ) single crystal, in magnetic fields up to 9 T and with different orientations $$\theta$$ θ relative to the crystal c axis. A significant $$\rho (T)_{H,\theta }$$ ρ ( T ) H , θ rounding is observed just above the superconducting critical temperature $$T_c$$ T c due to Cooper pairs created by superconducting fluctuations. These data are analyzed in terms of a generalization of the Aslamazov-Larkin approach, that extends its applicability to high reduced-temperatures and magnetic fields. This method allows us to carry out a criterion-independent determination of the angular dependence of the upper critical field, $$H_{c2}(\theta )$$ H c 2 ( θ ) . In spite of the relatively small anisotropy of this compound, it is found that $$H_{c2}(\theta )$$ H c 2 ( θ ) presents a significant deviation from the single-band 3D anisotropic Ginzburg-Landau (3D-aGL) approach, particularly for large $$\theta$$ θ (typically above $$\sim 60^o$$ ∼ 60 o ). These results are interpreted in terms of the multiband nature of these materials, in contrast with other proposals for similar $$H_{c2}(\theta )$$ H c 2 ( θ ) anomalies. Our results are also consistent with an effective anisotropy factor almost temperature independent near $$T_c$$ T c , a result that differs from the ones obtained by using a single-band model.

Upper critical field measurements using pulsed magnetic fields in Bi1.6Pb0.4Sr2Ca2Cu2+xOy(x=0.8, 1.2, 1.6)

1989 ◽  
Vol 1 (16) ◽  
pp. 2755-2758 ◽  
Author(s):  
Mao Xianglei ◽  
Liu Hongbao ◽  
Du Quan ◽  
Zhang Weijie ◽  
Mao Zhiqiang ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Critical Field ◽  
Upper Critical Field ◽  
Field Measurements ◽  
Pulsed Magnetic Fields
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