NMR and NQR studies on superconducting Sr2RuO4

Kenji Ishida; Hiroshi Murakawa; Hidekazu Mukuda; Yoshio Kitaoka; Z. Q. Mao; Yoshiteru Maeno

doi:10.1016/j.jpcs.2008.06.028

NMR and NQR studies on superconducting Sr₂RuO₄

Kenji Ishida, Hiroshi Murakawa, Hidekazu Mukuda, Yoshio Kitaoka, Z. Q. Mao, Yoshiteru Maeno

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We review our nuclear-magnetic resonance (NMR) and nuclear-quadrupole-resonance (NQR) studies in superconducting Sr₂RuO₄, which have been performed in order to investigate the gap structure and the pairing symmetry in the superconducting state and magnetic fluctuations in the normal state. The spin-lattice relaxation rate (1 / T₁) of a high-quality sample with T_c ∼ 1.5 K shows a sharp decrease without a coherence peak just below T_c, followed by a T³ behavior down to 0.15 K. This result indicates that the superconducting gap in pure Sr₂RuO₄ is a highly anisotropic character with a line-node gap. The Knight shift, which is related to the spin susceptibility, is unchanged in the superconducting state irrespective of the direction of the applied fields and various magnitude of the field. This result strongly suggests that the superconducting pairs are in the spin-triplet state, and the spin direction of the triplet pairs is considered to be changed by small fields of several hundred Oe.

Original language	English (US)
Pages (from-to)	3108-3114
Number of pages	7
Journal	Journal of Physics and Chemistry of Solids
Volume	69
Issue number	12
DOIs	https://doi.org/10.1016/j.jpcs.2008.06.028
State	Published - Dec 2008

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.jpcs.2008.06.028

Cite this

@article{397e4eca13644110859520fddd52c95d,

title = "NMR and NQR studies on superconducting Sr2RuO4",

abstract = "We review our nuclear-magnetic resonance (NMR) and nuclear-quadrupole-resonance (NQR) studies in superconducting Sr2RuO4, which have been performed in order to investigate the gap structure and the pairing symmetry in the superconducting state and magnetic fluctuations in the normal state. The spin-lattice relaxation rate (1 / T1) of a high-quality sample with Tc ∼ 1.5 K shows a sharp decrease without a coherence peak just below Tc, followed by a T3 behavior down to 0.15 K. This result indicates that the superconducting gap in pure Sr2RuO4 is a highly anisotropic character with a line-node gap. The Knight shift, which is related to the spin susceptibility, is unchanged in the superconducting state irrespective of the direction of the applied fields and various magnitude of the field. This result strongly suggests that the superconducting pairs are in the spin-triplet state, and the spin direction of the triplet pairs is considered to be changed by small fields of several hundred Oe.",

author = "Kenji Ishida and Hiroshi Murakawa and Hidekazu Mukuda and Yoshio Kitaoka and Mao, {Z. Q.} and Yoshiteru Maeno",

note = "Funding Information: We thank H. Yaguchi and S. Nakatsuji for experimental support and valuable discussions. We also thank K. Miyake, H. Kohno, H. Ikeda, K. Yamada, Y. Yanase, M. Udagawa, M. Ogata, A. Hasegawa, D. F. Agterberg, and M. Sigrist for valuable discussions. This work was partially supported by the 21 COE program on “Center for Diversity and Universality in Physics” from MEXT of Japan, and by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) (No. 18340102) and MEXT (Grant no. 16076209).",

year = "2008",

month = dec,

doi = "10.1016/j.jpcs.2008.06.028",

language = "English (US)",

volume = "69",

pages = "3108--3114",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Limited",

number = "12",

}

TY - JOUR

T1 - NMR and NQR studies on superconducting Sr2RuO4

AU - Ishida, Kenji

AU - Murakawa, Hiroshi

AU - Mukuda, Hidekazu

AU - Kitaoka, Yoshio

AU - Mao, Z. Q.

AU - Maeno, Yoshiteru

N1 - Funding Information: We thank H. Yaguchi and S. Nakatsuji for experimental support and valuable discussions. We also thank K. Miyake, H. Kohno, H. Ikeda, K. Yamada, Y. Yanase, M. Udagawa, M. Ogata, A. Hasegawa, D. F. Agterberg, and M. Sigrist for valuable discussions. This work was partially supported by the 21 COE program on “Center for Diversity and Universality in Physics” from MEXT of Japan, and by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) (No. 18340102) and MEXT (Grant no. 16076209).

PY - 2008/12

Y1 - 2008/12

N2 - We review our nuclear-magnetic resonance (NMR) and nuclear-quadrupole-resonance (NQR) studies in superconducting Sr2RuO4, which have been performed in order to investigate the gap structure and the pairing symmetry in the superconducting state and magnetic fluctuations in the normal state. The spin-lattice relaxation rate (1 / T1) of a high-quality sample with Tc ∼ 1.5 K shows a sharp decrease without a coherence peak just below Tc, followed by a T3 behavior down to 0.15 K. This result indicates that the superconducting gap in pure Sr2RuO4 is a highly anisotropic character with a line-node gap. The Knight shift, which is related to the spin susceptibility, is unchanged in the superconducting state irrespective of the direction of the applied fields and various magnitude of the field. This result strongly suggests that the superconducting pairs are in the spin-triplet state, and the spin direction of the triplet pairs is considered to be changed by small fields of several hundred Oe.

AB - We review our nuclear-magnetic resonance (NMR) and nuclear-quadrupole-resonance (NQR) studies in superconducting Sr2RuO4, which have been performed in order to investigate the gap structure and the pairing symmetry in the superconducting state and magnetic fluctuations in the normal state. The spin-lattice relaxation rate (1 / T1) of a high-quality sample with Tc ∼ 1.5 K shows a sharp decrease without a coherence peak just below Tc, followed by a T3 behavior down to 0.15 K. This result indicates that the superconducting gap in pure Sr2RuO4 is a highly anisotropic character with a line-node gap. The Knight shift, which is related to the spin susceptibility, is unchanged in the superconducting state irrespective of the direction of the applied fields and various magnitude of the field. This result strongly suggests that the superconducting pairs are in the spin-triplet state, and the spin direction of the triplet pairs is considered to be changed by small fields of several hundred Oe.

UR - http://www.scopus.com/inward/record.url?scp=57049087661&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=57049087661&partnerID=8YFLogxK

U2 - 10.1016/j.jpcs.2008.06.028

DO - 10.1016/j.jpcs.2008.06.028

M3 - Article

AN - SCOPUS:57049087661

SN - 0022-3697

VL - 69

SP - 3108

EP - 3114

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 12

ER -

NMR and NQR studies on superconducting Sr₂RuO₄

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this