Physics – Condensed Matter – Superconductivity
Scientific paper
2000-10-20
Phys. Rev. Lett. 85, 5627--5630 (2000)
Physics
Condensed Matter
Superconductivity
5 pages incl. 5 EPS figures, REVTeX, accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.85.5627
We have measured the spin susceptibility of the underdoped high temperature superconductor, YBa2Cu4O8 by Gd^{3+} electron spin resonance in single crystals and aligned powders at several magnetic fields between 3 and 15.4 T. At low temperatures and high fields, the spin susceptibility of the CuO2 planes is enhanced slightly in the $B\parallel c$ orientation with respect to the $B\perp c$ orientation. The enhancement in an applied field of 15.4 T ($\approx 0.15 H_{c2}$) at 16 K (0.2 $T_c$) is approximately 10 percent of the susceptibility measured at $T_c$. Such a small magnitude suggests that the second critical field of superconductivity, $H_{c2}\approx 100 T$, would not suppress the pseudogap. This work demonstrates the potential of high field ESR in single crystals for studying high $T_c$ superconductors.
Dabrowski Bogdan
Feher Titusz
Horvatic Mladen
Janossy Andras
Klamut Piotr W.
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