Physics – Condensed Matter – Superconductivity
Scientific paper
2010-11-06
Physical Review B 83, 144524 (2011)
Physics
Condensed Matter
Superconductivity
7 pages, 3 figures, added discussions and references, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.83.144524
The weak magnetic field induced reduction of the low-temperature superfluid density in cuprate superconductors is studied based on the kinetic energy driven superconducting mechanism. The electromagnetic response kernel is evaluated by considering both couplings of the electron charge and electron magnetic momentum with a weak magnetic field and employed to calculate the superfluid density, then the main features of the weak magnetic field induced reduction of the low-temperature superfluid density are well reproduced. The theory also shows that the striking behavior of the weak magnetic field induced reduction of the low-temperature superfluid density is intriguingly related to both depairing due to the Pauli spin polarization and nonlocal response in the vicinity of the d-wave gap nodes on the Fermi surface to a weak magnetic field.
Feng Shiping
Huang Zheyu
Zhao Huaisong
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