scholarly journals Temperature-dependent anisotropies of upper critical field and London penetration depth

2019 ◽  
Vol 100 (1) ◽  
Author(s):  
V. G. Kogan ◽  
R. Prozorov ◽  
A. E. Koshelev
Keyword(s):  
Penetration Depth ◽  
Critical Field ◽  
Upper Critical Field ◽  
London Penetration Depth ◽  
Temperature Dependent

scholarly journals Pauli-limit upper critical field of high-temperature superconductor La1.84Sr0.16CuO4

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Daisuke Nakamura ◽  
Tadashi Adachi ◽  
Keisuke Omori ◽  
Yoji Koike ◽  
Shojiro Takeyama
Keyword(s):  
High Temperature ◽  
Critical Field ◽  
High Temperature Superconductor ◽  
Upper Critical Field ◽  
Small Contribution ◽  
Spin Orbit Coupling ◽  
Temperature Dependent ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

AbstractThe upper critical field of a cuprate high-temperature superconductor, La1.84Sr0.16CuO4, was investigated by high-frequency self-resonant contactless electrical conductivity measurements in magnetic fields up to 102 T. An irreversible transition was observed at 85 T (T = 4.2 K), defined as the upper critical field. The temperature-dependent upper critical field was argued on the basis of the Werthamer-Helfand-Hohenberg theory. The Pauli-limiting pair-breaking process with a small contribution of the spin-orbit coupling explained the first-order phase transition exhibiting a hysteresis observed at low temperatures.

scholarly journals UPPER CRITICAL FIELD OF Mo-Ni HETEROSTRUCTURES

1985 ◽  
Vol 56 ◽  
Author(s):  
CTIRAD UHER ◽  
W.J. WATSON ◽  
J.L. COHN ◽  
IVAN K. SCHULLER
Keyword(s):  
Temperature Dependence ◽  
Critical Field ◽  
Layered Structure ◽  
Short Wavelength ◽  
Upper Critical Field ◽  
Spin Orbit ◽  
Temperature Dependent ◽  
Disordered Structure ◽  
Chandrasekhar Limit ◽  
Parallel Critical Field

AbstractUpper critical field and its anisotropy have been measured on two very short wavelength Mo-Ni heterostructures of different degrees of perfection, λ = 13.8Å (disordered structure) and X = 16.6Å (layered structure). In both cases the parallel critical field has an unexpected temperature dependence, a large and temperature dependent anisotropy, and over 60% enhancement over the Clogston-Chandrasekhar limit. Data are fit to the Werthamer-Helfand-Hohenberg theory and the spin-orbit scattering times are found to be 1.79 × 10−13 sec and 2 × 10−13 sec, respectively.

Upper critical field, penetration depth, and GL parameter of Tl-2223 single crystals

1994 ◽  
Vol 235-240 ◽  
pp. 1845-1846 ◽  
Author(s):  
G. Brandstätter ◽  
F.M. Sauerzopf ◽  
H.W. Weber ◽  
F. Ladenberger ◽  
E. Schwarzmann
Keyword(s):  
Single Crystals ◽  
Penetration Depth ◽  
Critical Field ◽  
Upper Critical Field ◽  
Field Penetration Depth ◽  
Field Penetration

FIB-deposited carbon-based superconducting nanowires with Tc ˜ 7 K

2009 ◽  
Vol 1206 ◽  
Author(s):  
Pashupati Dhakal ◽  
Gregory McMahon ◽  
Liam Norris ◽  
Jeong Il Oh ◽  
Michael J. Naughton
Keyword(s):  
Critical Field ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Upper Critical Field ◽  
Deposition Process ◽  
Direct Write ◽  
Helium Temperature ◽  
Zero Temperature ◽  
Temperature Dependent ◽  
Superconducting Nanowires

AbstractWe have fabricated carbon-containing nanowires by a gallium focused ion beam-induced deposition process from the precursor phenanthrene, C14H10. The electrical conductivity of the nanowires is only weakly temperature dependent below 300K, and reveals a superconducting state below Tc ˜ 7 K. We have measured the temperature dependence of the resistive upper critical field Hc2(T), and from those data, estimate the zero temperature critical field and coherence length to be 8.8 T and 6.1 nm, respectively. The Tc of this material is approximately 40% higher than that in any other FIB/direct write nanowire, such as those based on W(Ga), and thus offers the possibility of fabricating superconducting direct-write nanostructures that function at liquid helium temperature.

scholarly journals Determining the temperature-dependent London penetration depth in HTS thin films and its effect on SQUID performance

2021 ◽  
Vol 119 (14) ◽  
pp. 142601
Author(s):  
Shane Keenan ◽  
Colin Pegrum ◽  
Marc Gali Labarias ◽  
Emma E. Mitchell
Keyword(s):  
Thin Films ◽  
Penetration Depth ◽  
London Penetration Depth ◽  
Temperature Dependent
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