Zeeman and Orbital Limiting Fields: Separated Spin and Charge Degrees of Freedom in Cuprate Superconductors

Abstract

Recent in-plane thermal (Nernst) and interlayer (tunnelling) transport experiments in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+y}$ high temperature superconductors report hugely different limiting magnetic fields. Based on pairing (and the uncertainty principle) combined with the definitions of the Zeeman energy and the magnetic length, we show that in the underdoped regime both fields convert to the same (normal state) pseudogap energy scale $T^{\ast }$ upon transformation as orbital and spin (Zeeman) critical fields, respectively. We reconcile these seemingly disparate findings invoking separated spin and charge degrees of freedom residing in different regions of a truncated Fermi surface.

4 pages, 3 figures; accepted for publication in Phys. Rev. B (Rapid Comm.)

References in corpus (6)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• The onset of the vortex-like Nernst signal above Tc in La_{2-x}Sr_xCuO_4 and Bi_2Sr_{2-y}La_yCuO_6
• The high-field phase diagram of the cuprates derived from the Nernst effect
• Closing the Pseudogap by Zeeman Splitting in Bi_2Sr_2CaCu_2O_8+y at High Magnetic Fields
• Hole Doping Dependence of the Coherence Length in $L{a}_{2-x}S{r}_{x}Cu{O}_4$ Thin Films
• Magnetic Field Effects in the Pseudogap Phase: A Precursor Superconductivity Scenario

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• Antiferromagnetic Spin Fluctuations in the Metallic Phase of Quasi-Two-Dimensional Organic Superconductors
• Comparative analysis of tunneling magnetoresistance in low-$T_c$ Nb/AlAlOx/Nb and high-$T_c$ Bi${}_{2-y}$Pb${}_y$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ intrinsic Josephson junctions
• Examination of the c-axis resistivity of Bi_{2}Sr_{2-x}La_xCuO_{6+δ} in magnetic fields up to 58 T
• Electromagnetic response of high-Tc superconductors -- the slave-boson and doped-carrier theories