101Ru knight shift measurement of superconducting Sr 2RuO4 under small magnetic fields parallel to the RuO 2 plane

H. Murakawa, K. Ishida, K. Kitagawa, H. Ikeda, Zhiqiang Mao, Y. Maeno

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We measured 101Ru Knight shift (101K) in Sr 2RuO4 superconductor under low magnetic fields parallel to the RuO2 plane (ab direction) in order to determine the direction of superconducting d vector in zero magnetic field. Kab was measured in a small field down to 550 Oe and in a temperature range down to 97 mK, by using nuclear-quadrupole-resonance (NQR) spectra. We found that Kab is invariant with respect to temperature on passing through Tc. Our results indicate that the spins of the superconducting pair are in the RuO 2 plane (with the superconducting d vector pointing in the c direction) when fields greater than 550 Oe are applied to the RuO2 plane. Taking into account the previous results that 101K is unchanged in the superconducting state when fields greater than 200 Oe are applied along the c axis. We suggest that the effect to fix the spins of the superconducting pairs in a certain crystal direction is weak in Sr 2RuO4 even if there exists a significant spin-orbit interaction originating from the Ru-4d orbitals and additional interactions between the chiral Cooper-pair electrons.

Original languageEnglish (US)
Article number024716
JournalJournal of the Physical Society of Japan
Volume76
Issue number2
DOIs
StatePublished - Feb 1 2007

Fingerprint

nuclear magnetic resonance
magnetic fields
nuclear quadrupole resonance
spin-orbit interactions
fixing
orbitals
temperature
crystals
electrons
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

@article{5c069f5b726540238bccc2239766f727,
title = "101Ru knight shift measurement of superconducting Sr 2RuO4 under small magnetic fields parallel to the RuO 2 plane",
abstract = "We measured 101Ru Knight shift (101K) in Sr 2RuO4 superconductor under low magnetic fields parallel to the RuO2 plane (ab direction) in order to determine the direction of superconducting d vector in zero magnetic field. Kab was measured in a small field down to 550 Oe and in a temperature range down to 97 mK, by using nuclear-quadrupole-resonance (NQR) spectra. We found that Kab is invariant with respect to temperature on passing through Tc. Our results indicate that the spins of the superconducting pair are in the RuO 2 plane (with the superconducting d vector pointing in the c direction) when fields greater than 550 Oe are applied to the RuO2 plane. Taking into account the previous results that 101K is unchanged in the superconducting state when fields greater than 200 Oe are applied along the c axis. We suggest that the effect to fix the spins of the superconducting pairs in a certain crystal direction is weak in Sr 2RuO4 even if there exists a significant spin-orbit interaction originating from the Ru-4d orbitals and additional interactions between the chiral Cooper-pair electrons.",
author = "H. Murakawa and K. Ishida and K. Kitagawa and H. Ikeda and Zhiqiang Mao and Y. Maeno",
year = "2007",
month = "2",
day = "1",
doi = "10.1143/JPSJ.76.024716",
language = "English (US)",
volume = "76",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "2",

}

101Ru knight shift measurement of superconducting Sr 2RuO4 under small magnetic fields parallel to the RuO 2 plane. / Murakawa, H.; Ishida, K.; Kitagawa, K.; Ikeda, H.; Mao, Zhiqiang; Maeno, Y.

In: Journal of the Physical Society of Japan, Vol. 76, No. 2, 024716, 01.02.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - 101Ru knight shift measurement of superconducting Sr 2RuO4 under small magnetic fields parallel to the RuO 2 plane

AU - Murakawa, H.

AU - Ishida, K.

AU - Kitagawa, K.

AU - Ikeda, H.

AU - Mao, Zhiqiang

AU - Maeno, Y.

PY - 2007/2/1

Y1 - 2007/2/1

N2 - We measured 101Ru Knight shift (101K) in Sr 2RuO4 superconductor under low magnetic fields parallel to the RuO2 plane (ab direction) in order to determine the direction of superconducting d vector in zero magnetic field. Kab was measured in a small field down to 550 Oe and in a temperature range down to 97 mK, by using nuclear-quadrupole-resonance (NQR) spectra. We found that Kab is invariant with respect to temperature on passing through Tc. Our results indicate that the spins of the superconducting pair are in the RuO 2 plane (with the superconducting d vector pointing in the c direction) when fields greater than 550 Oe are applied to the RuO2 plane. Taking into account the previous results that 101K is unchanged in the superconducting state when fields greater than 200 Oe are applied along the c axis. We suggest that the effect to fix the spins of the superconducting pairs in a certain crystal direction is weak in Sr 2RuO4 even if there exists a significant spin-orbit interaction originating from the Ru-4d orbitals and additional interactions between the chiral Cooper-pair electrons.

AB - We measured 101Ru Knight shift (101K) in Sr 2RuO4 superconductor under low magnetic fields parallel to the RuO2 plane (ab direction) in order to determine the direction of superconducting d vector in zero magnetic field. Kab was measured in a small field down to 550 Oe and in a temperature range down to 97 mK, by using nuclear-quadrupole-resonance (NQR) spectra. We found that Kab is invariant with respect to temperature on passing through Tc. Our results indicate that the spins of the superconducting pair are in the RuO 2 plane (with the superconducting d vector pointing in the c direction) when fields greater than 550 Oe are applied to the RuO2 plane. Taking into account the previous results that 101K is unchanged in the superconducting state when fields greater than 200 Oe are applied along the c axis. We suggest that the effect to fix the spins of the superconducting pairs in a certain crystal direction is weak in Sr 2RuO4 even if there exists a significant spin-orbit interaction originating from the Ru-4d orbitals and additional interactions between the chiral Cooper-pair electrons.

UR - http://www.scopus.com/inward/record.url?scp=33847379493&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847379493&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.76.024716

DO - 10.1143/JPSJ.76.024716

M3 - Article

AN - SCOPUS:33847379493

VL - 76

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 2

M1 - 024716

ER -