Strong diamagnetic response and specific heat anomaly aboveTcin underdopedLa2−xSrxCuO4

@article{Thisted2003StrongDR,
  title={Strong diamagnetic response and specific heat anomaly aboveTcin underdopedLa2−xSrxCuO4},
  author={Ulrik Thisted and J{\o}rgen Nyhus and T. Suzuki and Junya Hori and Kristian Fossheim},
  journal={Physical Review B},
  year={2003},
  volume={67},
  pages={184510}
}
By measuring ac susceptibility using a very low amplitude of the ac field $(l1\mathrm{mG})$ it is shown that underdoped samples of ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ are diamagnetic in a temperature region above ${T}_{c}$ up to a temperature ${T}^{*}.$ This behavior is only observed with ac fields along the c axis whereas for fields in the $\mathrm{ab}$ plane no diamagnetism above ${T}_{c}$ was detected. The diamagnetism is almost frequency independent in the… 
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4 Citations

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Strong diamagnetic response and specific heat anomaly above Tc in underdoped La2-xSrxCuO4
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References

SHOWING 1-10 OF 14 REFERENCES
Pseudogap Precursor of the Superconducting Gap in Under- and Overdoped Bi 2 Sr 2 CaCu 2 O 8 + δ
We present tunneling spectroscopy of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ single crystals as a function of oxygen doping and temperature. The…
Doping Dependence of the Pseudogap in La(2-x)Sr(x)CuO(4)
We report the results of Raman scattering experiments on single crystals of ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ that span the range from underdoped $(x=0.10)$ to…
Observation of diamagnetic precursor to the Meissner state above Tc in high-Tc La2−xSrxCuO4 cuprates by scanning SQUID microscopy
Elastic and specific heat critical properties of La1.85Sr0.15CuO4
Vortex-like excitations and the onset of superconducting phase fluctuation in underdoped La2-xSrxCuO4
TLDR
Evidence for vortices (or vortex-like excitations) in La2-xSrxCuO4 at temperatures significantly above the critical temperature is reported.
Extreme type-II superconductors in a magnetic field: A theory of critical fluctuations
A theory of critical fluctuations in extreme type-II superconductors subjected to a finite but weak external magnetic field is presented. It is shown that the standard Ginzburg-Landau representation…
Importance of phase fluctuations in superconductors with small superfluid density
THE superconducting state of a metal is characterized by a complex order parameter with an amplitude and a phase. In the BCS-Eliashberg mean-field theory1, which is a very good approximation for…
Superconductors in realistic geometries: Geometric edge barrier versus pinning
The pseudogap in high-temperature superconductors: an experimental survey
We present an experimental review of the nature of the pseudogap in the cuprate superconductors. Evidence from various experimental techniques points to a common phenomenology. The pseudogap is seen…
Geometrical barriers in high-temperature superconductors.
TLDR
A theoretical description of vortex dynamics in thin flat samples is derived and is found to compare favorably with experimental results, finding a vortex concentration in the center of the sample and a zero-field peak in the magnetization loops.
...
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