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Journal Articles

Possible collective spin excitation in the spin-triplet superconducting state of Sr$$_2$$RuO$$_4$$; Multi-band theory

Nomura, Takuji; Hirashima, Dai*; Yamada, Kosaku*

Journal of the Physical Society of Japan, 77(2), p.024701_1 - 024701_10, 2008/02

https://doi.org/10.1143/JPSJ.77.024701
 Times Cited Count：8 Percentile：49.93(Physics, Multidisciplinary)

We investigate possible collective spin excitation by calculating the dynamical spin susceptibility in the spin-triplet superconducting state of Sr$$_2$$RuO$$_4$$. The effect of the fluctuating triplet-pairing condensate on the spin susceptibility is taken into account. The triplet pairing symmetry is assumed to be the most promising form: ${bf $d$}$(${bf $k$}$) $$sim$$ ($$k_x$$ + $rm i$k_y)hat{z}$$. For small (maybe realistic) anisotropy of pairing interaction in spin space, we expect a possible low-energy spin-wave mode as a peak structure in the imaginary part of the dynamical spin susceptibility, isolated from the spin excitation continuum. The present work is a natural extension of previous single-band calculations to a more realistic three-band calculation.

Oral presentation

Theory of magnetic properties in the spin-triplet superconducting state of Sr$$_2$$RuO$$_4$$

Nomura, Takuji; Hirashima, Dai*; Ikeda, Hiroaki*

no journal, , 

We calculate the spin susceptibility $$chi({bf q}, omega)$$ and the NMR relaxation rate $$1/T_1$$ in the spin-triplet superconducting state of Sr$$_2$$RuO$$_4$$. We start with a three-band Hubbard model possessing a realistic electronic structure. The calculated NMR relaxation rate shows Korringa relation above $$T_c$$ and $$T^3$$ behavior from just below $$T_c$$, without a Hebel-Slichter peak. This temperature dependence is consistent with experiments, but the calculated anisotropy of $$1/T_1$$ ($$[1/T_1]_c/[1/T_1]_{ab}$$) is too small to explain the large experimental value, i.e., about two. We will discuss the anisotropy and the momentum and frequency dependences of $$chi({bf q}, omega)$$. We will investigate also possible spin-wave modes for the same superconducting order parameter in the three-band model.

Oral presentation

Theory of spin-wave excitation in the spin-triplet superconducting state of Sr$$_2$$RuO$$_4$$; Multi-band calculation

Nomura, Takuji; Hirashima, Dai*

no journal, , 

We discuss possible collective spin-wave excitation in the spin-triplet superconducting state of the ruthenate superconductor Sr$$_2$$RuO$$_4$$. Using a realistic multi-band electronic structure and the superconducting gap structure obtained by microscopic calculation, we calculate the in-plane spin susceptibility and obtain the collective spin excitation spectrum. Fluctuation effect of the triplet-pairing condensate on the in-plane susceptibility is taken into account. As a result from rotational symmetry breaking in spin space, collective spin excitation mode can appear in the in-plane spin susceptibility.

Oral presentation

Multi-band theory of collective spin excitation in the spin-triplet superconductivity of Sr$$_2$$RuO$$_4$$

Nomura, Takuji; Hirashima, Dai*

no journal, , 

no abstracts in English

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