Pairing-Symmetry Selection in a Weakly Doped Canted Antiferromagnet on the Triangular Lattice

• Authors: P. Wróbel , W. Suleja
• Languages of publication: EN

Abstracts

EN

The mechanism of superconductivity generation by spin fluctuations in the electron doped canted antiferromagnet on the triangular lattice was analyzed. The underlying assumption is that the formation of the bound state is the prerequisite of pairing. The outcome of this analysis is also valid if an additional isotropic attraction is active but the anisotropic spin-fluctuation mediated force decides on the symmetry of the two-particle bound state. When the canted antiferromagnetic state is generated, the symmetry of the point group C_{6v} for the triangular lattice is lowered to the symmetry of C_{3v}. It is demonstrated that spin fluctuations definitely favor the p-wave bound state, which transforms according to the E representation of C_{3v}. Since the inversion is not an element of C_{3v}, the parity is not a good quantum number and thus the predicted paired state will be a mixture of singlet and triplet. Such a scenario may be relevant to physics of superconducting triangular cobaltates or organics.

Keywords

EN

71.10.Fd; 74.20.Mn; 75.50.Ee

Discipline

• 75.50.Ee: Antiferromagnetics
• 74.20.Mn: Nonconventional mechanisms
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 1
• Pages: 225-228

Dates

published

2008-07

received

2007-11-06

Contributors

author

P. Wróbel

• Institute for the Low Temperature and Structure Research, P.O. Box 1410, 50-950 Wrocław 2, Poland

author

W. Suleja

• Institute for the Low Temperature and Structure Research, P.O. Box 1410, 50-950 Wrocław 2, Poland

References

• 1. . D.A. Huse, V. Elser, Phys. Rev. Lett. 60, 2531 (1988)
• 2. R. Deutscher, H.U. Everts, Z. Phys. B 93, 77 (1993)
• 3. B. Bernu, C. Lhuillier, L. Pierre, Phys. Rev. Lett. 69, 2590 (1992)
• 4. B. Bernu, P. Lecheminant, C. Lhuiller, L. Pierre, Phys. Rev. B 50, 10 048 (1994)
• 5. P. Wróbel, R. Eder, Phys. Rev. B 58, 15160 (1998)
• 6. K.A. Chao, J. Spałek, A.M. Oleś, Phys. Rev. B 18, 3453 (1978)
• 7. P. Wróbel, W. Suleja, Phys. Rev. B 76, 214509 (1907)

Identifiers

DOI

10.12693/APhysPolA.114.225