Physics – Condensed Matter – Superconductivity
Scientific paper
2009-06-09
Physics
Condensed Matter
Superconductivity
10 pages, 11 figures. Final version with revised text and expanded discussion and 1 new figure (Fig. 10) and 1 modified fig (F
Scientific paper
In the cuprate superconductors, Nernst and torque magnetization experiments have provided evidence that the disappearance of the Meissner effect at $T_c$ is caused by the loss of long-range phase coherence, rather than the vanishing of the pair condensate. Here we report a series of torque magnetization measurements on single crystals of $\mathrm{La_{2-x}Sr_xCuO_4}$ (LSCO), $\mathrm{Bi_2Sr_{2-y}La_yCuO_6}$ (Bi 2201), $\mathrm{Bi_2Sr_2CaCu_2O_{8+\delta}}$ (Bi 2212) and optimal $\mathrm{YBa_2Cu_3O_7}$. Some of the measurements were taken to fields as high as 45 T. Focusing on the magnetization above $T_c$, we show that the diamagnetic term $M_d$ appears at an onset temperature $T^M_{onset}$ high above $T_c$. We construct the phase diagram of both LSCO and Bi 2201 and show that $T^M_{onset}$ agrees with the onset temperature of the vortex Nernst signal $T^{\nu}_{onset}$. Our results provide thermodynamic evidence against a recent proposal that the high-temperature Nernst signal in LSCO arises from a quasiparticle contribution in a charge-ordered state.
Ando Yoichi
Gu G.-D.
Komiya Seiki
Li Lu
Ong N. P.
No associations
LandOfFree
Diamagnetism and Cooper pairing above $T_c$ in cuprates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Diamagnetism and Cooper pairing above $T_c$ in cuprates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diamagnetism and Cooper pairing above $T_c$ in cuprates will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-205944