Determination of the upper critical field of the electron-doped superconductorSm1.85Ce0.15CuO4−yfrom resistive fluctuations

1992 ◽  
Vol 46 (21) ◽  
pp. 14290-14292 ◽  
Author(s):  
S. H. Han ◽  
C. C. Almasan ◽  
M. C. de Andrade ◽  
Y. Dalichaouch ◽  
M. B. Maple
Keyword(s):  
Critical Field ◽  
Upper Critical Field

Experimental determination of the upper critical field of epitaxially grown thin films of YBa2Cu3O7−δdown to He temperature

1991 ◽  
Vol 70 (4) ◽  
pp. 2230-2233 ◽  
Author(s):  
R. Wördenweber ◽  
M. O. Abd‐El‐Hamed ◽  
J. Schneider ◽  
O. Laborde
Keyword(s):  
Thin Films ◽  
Experimental Determination ◽  
Critical Field ◽  
Upper Critical Field

Determination of the precise upper critical field of YNi2B2C superconductor

1998 ◽  
Vol 303 (1-2) ◽  
pp. 57-59 ◽  
Author(s):  
Mi-Ock Mun ◽  
Mun-Seog Kim ◽  
Sung-Ik Lee ◽  
B.K Cho ◽  
In-Sang Yang ◽  
...  
Keyword(s):  
Critical Field ◽  
Upper Critical Field

scholarly journals Determination of the Upper Critical Field of a Single Crystal LiFeAs: The Magnetic Torque Study up to 35 Tesla

2011 ◽  
Vol 80 (1) ◽  
pp. 013706 ◽  
Author(s):  
Nobuyuki Kurita ◽  
Kentaro Kitagawa ◽  
Kazuyuki Matsubayashi ◽  
Ade Kismarahardja ◽  
Eun-Sang Choi ◽  
...  
Keyword(s):  
Single Crystal ◽  
Critical Field ◽  
Upper Critical Field ◽  
Magnetic Torque

DETERMINATIONS OF UPPER CRITICAL FIELDS IN CONTINUOUS GINZBURG–LANDAU MODEL

2004 ◽  
Vol 15 (06) ◽  
pp. 783-807
Author(s):  
L. WANG ◽  
H. S. LIM ◽  
C. K. ONG
Keyword(s):  
Critical Field ◽  
Eigenvalue Problems ◽  
Upper Critical Field ◽  
Critical Fields ◽  
Ginzburg Landau ◽  
Direction Parallel ◽  
Landau Model ◽  
The Magnetic Field ◽  
Good Agreement

Novel procedures to determine the parallel upper critical field Bc2 (one-dimensional, 1D) have been proposed within a continuous Ginzburg–Landau model. Unlike conventional methods, where Bc2 is obtained through the determination of the smallest eigenvalue of an appropriate eigen equation, the square of the magnetic field is treated as eigenvalue problems by two procedures so that the upper critical field can be directly deduced. The two procedures proposed are extended to determine the upper critical field in the c–a crystal plane (two-dimensional, 2D) with an arbitrary angle θ tilted from the c-axis. The calculated Bc2 from the two procedures are consistent with each other in both 1D and 2D cases. Moreover, the values of Bc2 near the direction parallel to the layers obtained in the 2D case well approximate the counterparts in the 1D case. The properties of the calculated Bc2 are in reasonably good agreement with existing theories and experiments. The profiles of the order parameters associated with Bc2 for both 1D and 2D cases are Gaussian-like, further validating the methodology proposed.

Magnetization measurements of single-crystalPb2Sr2(Y,Ca)Cu3O8: Determination of the coherence length and upper critical field

1992 ◽  
Vol 45 (17) ◽  
pp. 10057-10061 ◽  
Author(s):  
M. Reedyk ◽  
C. V. Stager ◽  
T. Timusk ◽  
J. S. Xue ◽  
J. E. Greedan
Keyword(s):  
Critical Field ◽  
Coherence Length ◽  
Upper Critical Field ◽  
Magnetization Measurements

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.

Enhancement of critical temperature and upper critical field due to Nb substitution in Zr-V alloy superconductors

2020 ◽  
Author(s):  
Sabyasachi Paul ◽  
S. K. Ramjan ◽  
L. S. Sharath Chandra ◽  
Archna Sagdeo ◽  
M. K. Chattopadhyay
Keyword(s):  
Critical Temperature ◽  
Critical Field ◽  
Upper Critical Field

scholarly journals Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

2013 ◽  
Vol 26 (8) ◽  
pp. 085003 ◽  
Author(s):  
E Antropov ◽  
M S Kalenkov ◽  
J Kehrle ◽  
V I Zdravkov ◽  
R Morari ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Critical Field ◽  
Upper Critical Field
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