Two-dimensional incommensurate magnetic fluctuations in Sr 2(Ru0.99Ti0.01)O4

Kazuki Iida; Jooseop Lee; Matthew B. Stone; Maiko Kofu; Yoshiyuki Yoshida; Seunghun Lee

doi:10.1143/JPSJ.81.124710

Two-dimensional incommensurate magnetic fluctuations in Sr ₂(Ru_0.99Ti_0.01)O₄

Kazuki Iida, Jooseop Lee, Matthew B. Stone, Maiko Kofu, Yoshiyuki Yoshida, Seunghun Lee

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Abstract

We investigate the imaginary part of the wave vector dependent dynamic spin susceptibility in Sr₂(Ru_0.99Ti_0.01)O ₄ as a function of temperature using neutron scattering. At T = 5 K, two-dimensional incommensurate (IC) magnetic fluctuations are clearly observed around Q_IC = (0.3,0.3,L) up to approximately 60 meV energy transfer. We find that the IC excitations disperse to ridges around the (π,π) point. Below 50 K, the energy and temperature dependent excitations are well described by the phenomenological response function for a Fermi liquid system with a characteristic energy of 3.9(1) meV. Although the characteristic energy scale of the magnetic fluctuations, hωSF, is slightly suppressed by the Ti-doping, the wave vector dependence of the IC magnetic fluctuations in Sr ₂(Ru_0.99Ti_0.01)O₄ is very similar to that in the Fermi liquid state of the parent compound, Sr₂RuO ₄.

Original language	English
Article number	124710
Journal	Journal of the Physical Society of Japan
Volume	81
Issue number	12
DOIs	https://doi.org/10.1143/JPSJ.81.124710
State	Published - Dec 2012

Keywords

Inelastic neutron scattering
Ruthenates

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title = "Two-dimensional incommensurate magnetic fluctuations in Sr 2(Ru0.99Ti0.01)O4",

abstract = "We investigate the imaginary part of the wave vector dependent dynamic spin susceptibility in Sr2(Ru0.99Ti0.01)O 4 as a function of temperature using neutron scattering. At T = 5 K, two-dimensional incommensurate (IC) magnetic fluctuations are clearly observed around QIC = (0.3,0.3,L) up to approximately 60 meV energy transfer. We find that the IC excitations disperse to ridges around the (π,π) point. Below 50 K, the energy and temperature dependent excitations are well described by the phenomenological response function for a Fermi liquid system with a characteristic energy of 3.9(1) meV. Although the characteristic energy scale of the magnetic fluctuations, hωSF, is slightly suppressed by the Ti-doping, the wave vector dependence of the IC magnetic fluctuations in Sr 2(Ru0.99Ti0.01)O4 is very similar to that in the Fermi liquid state of the parent compound, Sr2RuO 4.",

keywords = "Inelastic neutron scattering, Ruthenates",

author = "Kazuki Iida and Jooseop Lee and Stone, {Matthew B.} and Maiko Kofu and Yoshiyuki Yoshida and Seunghun Lee",

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doi = "10.1143/JPSJ.81.124710",

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T1 - Two-dimensional incommensurate magnetic fluctuations in Sr 2(Ru0.99Ti0.01)O4

AU - Iida, Kazuki

AU - Lee, Jooseop

AU - Stone, Matthew B.

AU - Kofu, Maiko

AU - Yoshida, Yoshiyuki

AU - Lee, Seunghun

PY - 2012/12

Y1 - 2012/12

N2 - We investigate the imaginary part of the wave vector dependent dynamic spin susceptibility in Sr2(Ru0.99Ti0.01)O 4 as a function of temperature using neutron scattering. At T = 5 K, two-dimensional incommensurate (IC) magnetic fluctuations are clearly observed around QIC = (0.3,0.3,L) up to approximately 60 meV energy transfer. We find that the IC excitations disperse to ridges around the (π,π) point. Below 50 K, the energy and temperature dependent excitations are well described by the phenomenological response function for a Fermi liquid system with a characteristic energy of 3.9(1) meV. Although the characteristic energy scale of the magnetic fluctuations, hωSF, is slightly suppressed by the Ti-doping, the wave vector dependence of the IC magnetic fluctuations in Sr 2(Ru0.99Ti0.01)O4 is very similar to that in the Fermi liquid state of the parent compound, Sr2RuO 4.

AB - We investigate the imaginary part of the wave vector dependent dynamic spin susceptibility in Sr2(Ru0.99Ti0.01)O 4 as a function of temperature using neutron scattering. At T = 5 K, two-dimensional incommensurate (IC) magnetic fluctuations are clearly observed around QIC = (0.3,0.3,L) up to approximately 60 meV energy transfer. We find that the IC excitations disperse to ridges around the (π,π) point. Below 50 K, the energy and temperature dependent excitations are well described by the phenomenological response function for a Fermi liquid system with a characteristic energy of 3.9(1) meV. Although the characteristic energy scale of the magnetic fluctuations, hωSF, is slightly suppressed by the Ti-doping, the wave vector dependence of the IC magnetic fluctuations in Sr 2(Ru0.99Ti0.01)O4 is very similar to that in the Fermi liquid state of the parent compound, Sr2RuO 4.

KW - Inelastic neutron scattering

KW - Ruthenates

UR - http://www.scopus.com/inward/record.url?scp=84870716325&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.81.124710

DO - 10.1143/JPSJ.81.124710

M3 - Article

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SN - 0031-9015

VL - 81

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 12

M1 - 124710

ER -

Two-dimensional incommensurate magnetic fluctuations in Sr ₂(Ru_0.99Ti_0.01)O₄

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