Europhys. Lett.
Volume 72, Number 2, October 2005
Page(s) 270 - 274
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 14 September 2005
Europhys. Lett., 72 (2), pp. 270-274 (2005)
DOI: 10.1209/epl/i2005-10229-5

Phase diagram and superconducting density of states of the quasi-two-dimensional $\mth{d}$-wave superconductor in parallel magnetic field

Biao Jin

College of Physical Science, Graduate School of the Chinese Academy of Sciences P.O. Box 3908, Beijing 100039, PRC

received 21 March 2005; accepted in final form 19 August 2005
published online 14 September 2005

We report on results of a theoretical study of the d-wave Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. A complete temperature vs. magnetic field phase diagram for a model system is obtained. This phase diagram comprises the normal phase, the zero-momentum pairing BCS phase and two types of FFLO phases. The magnetic-field variation of the superconducting density of states, $N_{S}(\varpi )$, is studied systematically. In the FFLO phase, we find a characteristic multi-peak structure in $N_{S}(\varpi )$, followed by its unique evolution. These highly distinctive features enable us to discriminate between the d-wave FFLO state and other types of superconducting states.

74.20.Rp - Pairing symmetries (other than s-wave).
74.25.Dw - Superconductivity phase diagrams.
74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).

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