Field-induced transitions from superconductors to Bose metal in La<sub>1.875</sub>Ba<sub>0.125</sub>CuO<sub>4</sub>
ORAL
Abstract
What happens to the pairing correlations in a cuprate superconductor when superconducting order is suppressed with a magnetic field? We have studied this problem in LBCO x=1/8, where 2D superconductivity appears below 40 K, but 3D order only occurs below 5 K, presumably due to pair-density-wave order intertwined with the spin- and charge-stripe orders. At T = 0.35 K, a c-axis magnetic field initially induces finite dissipation near 10 T, followed by re-entrant 2D superconductivity between 18 and 22 T [1]. The resistance per CuO2 plane rises to h/(4e2) near 31 T, but then saturates at 2h/(4e2) at higher fields. The saturation of the resistance indicates metallic behavior, but the fact that the Hall coefficient is ~ 0 indicates a lack of quasiparticles. We conclude that conduction is by incoherent hopping of pairs between charge stripes, indicating that stripes are good for pairing, but not phase coherence.
[1] Y. Li et al., arXiv:1810.10646.
[1] Y. Li et al., arXiv:1810.10646.
*Work at BNL supported by Office of Basic Energy Sciences, US DOE, under Contract No. DE-SC0012704. Work at NHMFL and FSU supported by NSF DMR-1707785 and NHMFL via NSF DMR-1644779 and the State of Florida.
–
Presenters
-
John Tranquada
- Brookhaven National Laboratory
- CMPMS, Brookhaven National Laboratory
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
- Condensed Matter Physics & Materials Science, Brookhaven National Laboratory
- Brookhaven Natl Lab