Spin polarization enhanced by spin-triplet pairing in Sr2RuO4 probed by NMR

被引：33

作者：

Ishida, K. ^{[1
]}

Manago, M. ^{[1
]}

Yamanaka, T. ^{[1
]}

Fukazawa, H. ^{[1
]}

Mao, Z. Q. ^{[1
]}

Maeno, Y. ^{[1
]}

Miyake, K. ^{[2
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[2] Toyota Phys & Chem Res Inst, Nagakute, Aichi 4801192, Japan

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 10期

基金：

日本学术振兴会;

关键词：

O-17; KNIGHT-SHIFT; CRITICAL-FIELD; SUPERCONDUCTIVITY; TRANSITION; LIMIT;

D O I：

10.1103/PhysRevB.92.100502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a phenomenon intimately related to the spin-triplet superconductivity. It is well known that the spin susceptibility decreases below the superconducting transition temperature in almost all superconductors because of spin-singlet pair formation, while it may remain unchanged in a handful of spin-triplet exceptions. Here we report the observation in Sr2RuO4 with nuclear magnetic resonance that the spin susceptibility originating from the Ru-4d electron slightly increases by similar to 2% of the total and becomes inhomogeneous in the superconducting state. These are reasonably explained if the electron pairs form the equal-spin pairing in the mixed state. A similar phenomenon was predicted for superfluid He-3 40 years ago, but had never been demonstrated in any superconductor.

引用

页数：5

共 31 条

[1] Intrinsic superconducting parameters of Sr2RuO4 [J].

Akima, T ;

NishiZaki, S ;

Maeno, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1999, 68 (02) :694-695

[2] Pauli paramagnetic effects on mixed-state properties in a strongly anisotropic superconductor: Application to Sr2RuO4 [J].

Amano, Yuujirou ;

Ishihara, Masahiro ;

Ichioka, Masanori ;

Nakai, Noriyuki ;

Machida, Kazushige .

PHYSICAL REVIEW B, 2015, 91 (14)

[3] Quasi-two-dimensional Fermi liquid properties of the unconventional superconductor Sr2RuO4 [J].

Bergemann, C ;

Mackenzie, AP ;

Julian, SR ;

Forsythe, D ;

Ohmichi, E .

ADVANCES IN PHYSICS, 2003, 52 (07) :639-725

[4] Scanning magnetic imaging of Sr2RuO4 -: art. no. 012504 [J].

Björnsson, PG ;

Maeno, Y ;

Huber, ME ;

Moler, KA .

PHYSICAL REVIEW B, 2005, 72 (01)

[5] UPPER LIMIT FOR CRITICAL FIELD IN HARD SUPERCONDUCTORS [J].

CLOGSTON, AM .

PHYSICAL REVIEW LETTERS, 1962, 9 (06) :266-&

[6] Superconducting double transition and the upper critical field limit of Sr2RuO4 in parallel magnetic fields [J].

Deguchi, K ;

Tanatar, MA ;

Mao, ZQ ;

Ishiguro, T ;

Maeno, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2002, 71 (12) :2839-2842

[7] Polarized-neutron scattering study of the Cooper-pair moment in Sr2RuO4 [J].

Duffy, JA ;

Hayden, SM ;

Maeno, Y ;

Mao, Z ;

Kulda, J ;

McIntyre, GJ .

PHYSICAL REVIEW LETTERS, 2000, 85 (25) :5412-5415

[8] Evolution of normal-state magnetic fluctuations by Ca and Ti substitutions in Sr2RuO4:: 87Sr-NMR study -: art. no. 214412 [J].

Ishida, K ;

Minami, Y ;

Kitaoka, Y ;

Nakatsuji, S ;

Kikugawa, N ;

Maeno, Y .

PHYSICAL REVIEW B, 2003, 67 (21)

[9] Spin-triplet superconductivity in Sr2RuO4 identified by 17O Knight shift [J].

Ishida, K ;

Mukuda, H ;

Kitaoka, Y ;

Asayama, K ;

Mao, ZQ ;

Mori, Y ;

Maeno, Y .

NATURE, 1998, 396 (6712) :658-660

[10] RuNMR probe of spin susceptibility in the superconducting state of Sr2RuO4 -: art. no. 060507 [J].

Ishida, K ;

Mukuda, H ;

Kitaoka, Y ;

Mao, ZQ ;

Fukazawa, H ;

Maeno, Y .

PHYSICAL REVIEW B, 2001, 63 (06) :605071-605074

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