Anisotropic superconducting gap in Sr2 RuO4 evidenced by a Ru NQR study

K. Ishida; H. Mukuda; Y. Kitaoka; Z. Q. Mao; Y. Mori; Y. Maeno

doi:10.1016/S0921-4526(99)01165-5

Anisotropic superconducting gap in Sr₂ RuO₄ evidenced by a Ru NQR study

K. Ishida, H. Mukuda, Y. Kitaoka, Z. Q. Mao, Y. Mori, Y. Maeno

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

¹⁰¹Ru nuclear spin-lattice relaxation rate, ¹⁰¹(1/T₁) was measured by Ru nuclear quadrupole resonance (NQR) under zero external field to investigate the superconducting gap property in the spin-triplet superconductor, Sr₂ RuO₄. T₁ T = constant behavior was seen in the normal state below 4.2 K. In the superconducting state, 1/T₁ in a recent sample with T_c ∼ 1.5 K shows a sharp decrease without a coherent peak just below T_c, followed by a T³ behavior down to 0.15 K, in contrast with the previous result that there exists a large residual density of states in low-T_c samples. This result indicates clearly that the large residual density of states in the low-T_c samples is an extrinsic effect, and that the superconducting gap in Sr₂ RuO₄ is a highly anisotropic nature with line nodes.

Original language	English (US)
Pages (from-to)	963-964
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	281-282
DOIs	https://doi.org/10.1016/S0921-4526(99)01165-5
State	Published - 2000
Event	Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Japan Duration: Aug 24 1999 → Aug 28 1999

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/S0921-4526(99)01165-5

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@article{522240cb86e9420db45f1a820c80e547,

title = "Anisotropic superconducting gap in Sr2 RuO4 evidenced by a Ru NQR study",

abstract = "101Ru nuclear spin-lattice relaxation rate, 101(1/T1) was measured by Ru nuclear quadrupole resonance (NQR) under zero external field to investigate the superconducting gap property in the spin-triplet superconductor, Sr2 RuO4. T1 T = constant behavior was seen in the normal state below 4.2 K. In the superconducting state, 1/T1 in a recent sample with Tc ∼ 1.5 K shows a sharp decrease without a coherent peak just below Tc, followed by a T3 behavior down to 0.15 K, in contrast with the previous result that there exists a large residual density of states in low-Tc samples. This result indicates clearly that the large residual density of states in the low-Tc samples is an extrinsic effect, and that the superconducting gap in Sr2 RuO4 is a highly anisotropic nature with line nodes.",

author = "K. Ishida and H. Mukuda and Y. Kitaoka and Mao, {Z. Q.} and Y. Mori and Y. Maeno",

note = "Funding Information: This work was supported by the COE Research (10CE2004) in Grant-in-Aid for Scientific Research from the Ministry of Education, Sport, Science and Culture of Japan.; Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) ; Conference date: 24-08-1999 Through 28-08-1999",

year = "2000",

doi = "10.1016/S0921-4526(99)01165-5",

language = "English (US)",

volume = "281-282",

pages = "963--964",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Anisotropic superconducting gap in Sr2 RuO4 evidenced by a Ru NQR study

AU - Ishida, K.

AU - Mukuda, H.

AU - Kitaoka, Y.

AU - Mao, Z. Q.

AU - Mori, Y.

AU - Maeno, Y.

N1 - Funding Information: This work was supported by the COE Research (10CE2004) in Grant-in-Aid for Scientific Research from the Ministry of Education, Sport, Science and Culture of Japan.

PY - 2000

Y1 - 2000

N2 - 101Ru nuclear spin-lattice relaxation rate, 101(1/T1) was measured by Ru nuclear quadrupole resonance (NQR) under zero external field to investigate the superconducting gap property in the spin-triplet superconductor, Sr2 RuO4. T1 T = constant behavior was seen in the normal state below 4.2 K. In the superconducting state, 1/T1 in a recent sample with Tc ∼ 1.5 K shows a sharp decrease without a coherent peak just below Tc, followed by a T3 behavior down to 0.15 K, in contrast with the previous result that there exists a large residual density of states in low-Tc samples. This result indicates clearly that the large residual density of states in the low-Tc samples is an extrinsic effect, and that the superconducting gap in Sr2 RuO4 is a highly anisotropic nature with line nodes.

AB - 101Ru nuclear spin-lattice relaxation rate, 101(1/T1) was measured by Ru nuclear quadrupole resonance (NQR) under zero external field to investigate the superconducting gap property in the spin-triplet superconductor, Sr2 RuO4. T1 T = constant behavior was seen in the normal state below 4.2 K. In the superconducting state, 1/T1 in a recent sample with Tc ∼ 1.5 K shows a sharp decrease without a coherent peak just below Tc, followed by a T3 behavior down to 0.15 K, in contrast with the previous result that there exists a large residual density of states in low-Tc samples. This result indicates clearly that the large residual density of states in the low-Tc samples is an extrinsic effect, and that the superconducting gap in Sr2 RuO4 is a highly anisotropic nature with line nodes.

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UR - http://www.scopus.com/inward/citedby.url?scp=0033893997&partnerID=8YFLogxK

U2 - 10.1016/S0921-4526(99)01165-5

DO - 10.1016/S0921-4526(99)01165-5

M3 - Conference article

AN - SCOPUS:0033893997

SN - 0921-4526

VL - 281-282

SP - 963

EP - 964

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

T2 - Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99)

Y2 - 24 August 1999 through 28 August 1999

ER -

Anisotropic superconducting gap in Sr₂ RuO₄ evidenced by a Ru NQR study

Abstract

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