TY - JOUR
T1 - Spin wave spectrum in the spin-spiral state of ferromagnetic superconductors
AU - Kotani, Akio
AU - Takahashi, Saburo
AU - Tachiki, Masashi
AU - Koyama, Tomio
AU - Matsumoto, Hideki
AU - Umezawa, Hiroomi
PY - 1980
Y1 - 1980
N2 - Effective interaction between localized magnetic moments in ferromagnetic superconductors is studied microscopically by taking account of the interplay among the electromagnetic field, persistent current and magnetic moments. The obtained effective exchange coupling Jij(q) can stabilize the spin-spiral ordering with a finite wave number Q, which coexists with superconductivity. By using this Jij(q), the spin wave spectrum ħωq in the spin-spiral state is calculated at zero temperature. Reflecting a characteristic anisotropy of Jji(q), ħωq depends strongly on the direction of q; for q⁄⁄Q it has a prominent peak at q∼Q, but the peak vanishes as q deviates from the Q direction. It is also shown that ħωq has many energy gaps characteristic of the magnetic superconductor.
AB - Effective interaction between localized magnetic moments in ferromagnetic superconductors is studied microscopically by taking account of the interplay among the electromagnetic field, persistent current and magnetic moments. The obtained effective exchange coupling Jij(q) can stabilize the spin-spiral ordering with a finite wave number Q, which coexists with superconductivity. By using this Jij(q), the spin wave spectrum ħωq in the spin-spiral state is calculated at zero temperature. Reflecting a characteristic anisotropy of Jji(q), ħωq depends strongly on the direction of q; for q⁄⁄Q it has a prominent peak at q∼Q, but the peak vanishes as q deviates from the Q direction. It is also shown that ħωq has many energy gaps characteristic of the magnetic superconductor.
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U2 - 10.1143/JPSJ.49.2144
DO - 10.1143/JPSJ.49.2144
M3 - Article
AN - SCOPUS:77952779917
SN - 0031-9015
VL - 49
SP - 2144
EP - 2151
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 6
ER -