Local electronic structure of a single magnetic impurity in superconducting NaxCoO2∙yH2O
Jin. An, Chang-De Gong, Hai-Qing Lin
DOI 10.1103/PhysRevB.72.014527 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The recent discovery of superconductivity in layered NaxCoO2∙yH2O has attracted much attention because this CoO2-based system shares many similarities with the high-Tc cuprate superconductors and studies of this system may shed light on the superconducting mechanism of the latter. In this work, we study the electronic structure around a magnetic impurity induced, for example, by Ni substitution of the Co in NaxCoO2∙yH2O. Four possible nodeless pairing symmetries (s, p1+ip2, d1+id2, and f wave) are considered. The local density of states (LDOS) and the subgap impurity states are studied. The sixfold anisotropic symmetry is found for the distribution function of the impurity states. This anisotropic feature disappears when doped away from the Van Hove singularity. For the three non-s-wave pairing states, except for the subgap deltalike peaks, the LDOS is characterized by dip/dip/gap/dip (or dip/gap/dip/dip) and dip/gap/dip features when the doping level is near and away from the Van Hove singularity, respectively. The dips’ relative positions in the LDOS (or peak’s relative position in the DOS), and other related properties are found to be quite distinct for different pairing states, suggesting that these properties can be taken as a probe to determine the intrinsic pairing symmetry by the scanning tunneling microscope experiments on the system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2.yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Spin resonance peak in NaCoOHO superconductors: A probe of the pairing symmetry
similarity 0.89Jian-Xin Li & Z. D. Wang · 2003 · arXiv:cond-mat/0310308
Source status unknown — claims are unverified
Nesting, spin-fluctuations, and odd-gap superconductivity in NaxCoO2 yH2O
similarity 0.89M. D. Johannes et al. · 2004 · arXiv:cond-mat/0403135
Source status unknown — claims are unverified
Possible Spin Triplet Superconductivity in NaxCoO2·yH2O
similarity 0.89Akihiro Tanaka & Xiao Hu
Source status unknown — claims are unverified
Nuclear Spin Relaxation Rate of Disordered -wave Superconductors
similarity 0.88Q. Han & Z. D. Wang · 2003 · arXiv:cond-mat/0308160
Source status unknown — claims are unverified
Vortex State in Na_xCoO_2.yH_2O: p_x\pm ip_y-wave versus d_{x^2-y^2}\pm id_{xy}-wave Pairing
similarity 0.88Qiang Han et al. · 2003 · arXiv:cond-mat/0306408
Source status unknown — claims are unverified
Nonmagnetic impurity resonance states as a test of superconducting pairing symmetry in CeCoIn
similarity 0.88Liu, Bin · 2016 · arXiv:1307.4170
Source status unknown — claims are unverified