Critical small-angle scattering of polarised neutrons in MnSi

R. Georgii; P. Böni; D. Lamago; S. Stüber; S. V. Grigoriev; S. V. Maleyev; A. I. Okorokov; H. Eckerlebe; P. K. Pranzas; B. Roessli; W. E. Fischer

doi:10.1016/j.physb.2004.04.055

Critical small-angle scattering of polarised neutrons in MnSi

R. Georgii
, P. Böni
, D. Lamago
, S. Stüber
, S. V. Grigoriev
, S. V. Maleyev
, A. I. Okorokov
, H. Eckerlebe
, P. K. Pranzas
, B. Roessli
, W. E. Fischer

Natural Sciences

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

3 Scopus citations

Abstract

The chiral fluctuations in the weak itinerant magnet MnSi were studied by means of small-angle neutron scattering with polarized neutrons. Due to the lack of a centre of symmetry, the magnetic moments are arranged along a left-handed spiral due to the Dzyaloshinskii-Moriya (DM) interaction. The experiments show that the incommensurate magnetic peaks evolve with increasing temperature into diffuse scattering that is mainly concentrated in a ring with the radius q _c=0.039 Å^-1 centred at the position of the direct beam q=0. The scattering is fully polarised for Q||P₀ and depolarised for Q⊥P₀ proving that the scattering is chiral and that the spiral has a unique handiness. From the data, we have determined the critical exponents of the magnetisation, the susceptibility and the correlation lengths of the chiral fluctuations. The results are discussed in the framework of the renormalisation theory.

Original language	English
Pages (from-to)	45-47
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	350
Issue number	1-3
DOIs	https://doi.org/10.1016/j.physb.2004.04.055
State	Published - 30 Jul 2004

Keywords

Critical exponents
DM interaction
Polarised SANS
Spin chirality

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10.1016/j.physb.2004.04.055

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@article{fcb394b22f8e4cc086b58c834c7bee57,

title = "Critical small-angle scattering of polarised neutrons in MnSi",

abstract = "The chiral fluctuations in the weak itinerant magnet MnSi were studied by means of small-angle neutron scattering with polarized neutrons. Due to the lack of a centre of symmetry, the magnetic moments are arranged along a left-handed spiral due to the Dzyaloshinskii-Moriya (DM) interaction. The experiments show that the incommensurate magnetic peaks evolve with increasing temperature into diffuse scattering that is mainly concentrated in a ring with the radius q c=0.039 {\AA}-1 centred at the position of the direct beam q=0. The scattering is fully polarised for Q||P0 and depolarised for Q⊥P0 proving that the scattering is chiral and that the spiral has a unique handiness. From the data, we have determined the critical exponents of the magnetisation, the susceptibility and the correlation lengths of the chiral fluctuations. The results are discussed in the framework of the renormalisation theory.",

keywords = "Critical exponents, DM interaction, Polarised SANS, Spin chirality",

author = "R. Georgii and P. B{\"o}ni and D. Lamago and S. St{\"u}ber and Grigoriev, \{S. V.\} and Maleyev, \{S. V.\} and Okorokov, \{A. I.\} and H. Eckerlebe and Pranzas, \{P. K.\} and B. Roessli and Fischer, \{W. E.\}",

note = "Funding Information: The PNPI-team acknowledges GKSS for their hospitality. The work is supported in part by the President grant SS-1671.2003.2 and the Russian State Program “Neutron Research of Solids”. ",

year = "2004",

month = jul,

day = "30",

doi = "10.1016/j.physb.2004.04.055",

language = "English",

volume = "350",

pages = "45--47",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

number = "1-3",

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TY - JOUR

T1 - Critical small-angle scattering of polarised neutrons in MnSi

AU - Georgii, R.

AU - Böni, P.

AU - Lamago, D.

AU - Stüber, S.

AU - Grigoriev, S. V.

AU - Maleyev, S. V.

AU - Okorokov, A. I.

AU - Eckerlebe, H.

AU - Pranzas, P. K.

AU - Roessli, B.

AU - Fischer, W. E.

N1 - Funding Information: The PNPI-team acknowledges GKSS for their hospitality. The work is supported in part by the President grant SS-1671.2003.2 and the Russian State Program “Neutron Research of Solids”.

PY - 2004/7/30

Y1 - 2004/7/30

N2 - The chiral fluctuations in the weak itinerant magnet MnSi were studied by means of small-angle neutron scattering with polarized neutrons. Due to the lack of a centre of symmetry, the magnetic moments are arranged along a left-handed spiral due to the Dzyaloshinskii-Moriya (DM) interaction. The experiments show that the incommensurate magnetic peaks evolve with increasing temperature into diffuse scattering that is mainly concentrated in a ring with the radius q c=0.039 Å-1 centred at the position of the direct beam q=0. The scattering is fully polarised for Q||P0 and depolarised for Q⊥P0 proving that the scattering is chiral and that the spiral has a unique handiness. From the data, we have determined the critical exponents of the magnetisation, the susceptibility and the correlation lengths of the chiral fluctuations. The results are discussed in the framework of the renormalisation theory.

AB - The chiral fluctuations in the weak itinerant magnet MnSi were studied by means of small-angle neutron scattering with polarized neutrons. Due to the lack of a centre of symmetry, the magnetic moments are arranged along a left-handed spiral due to the Dzyaloshinskii-Moriya (DM) interaction. The experiments show that the incommensurate magnetic peaks evolve with increasing temperature into diffuse scattering that is mainly concentrated in a ring with the radius q c=0.039 Å-1 centred at the position of the direct beam q=0. The scattering is fully polarised for Q||P0 and depolarised for Q⊥P0 proving that the scattering is chiral and that the spiral has a unique handiness. From the data, we have determined the critical exponents of the magnetisation, the susceptibility and the correlation lengths of the chiral fluctuations. The results are discussed in the framework of the renormalisation theory.

KW - Critical exponents

KW - DM interaction

KW - Polarised SANS

KW - Spin chirality

UR - https://www.scopus.com/pages/publications/3242733160

U2 - 10.1016/j.physb.2004.04.055

DO - 10.1016/j.physb.2004.04.055

M3 - Article

AN - SCOPUS:3242733160

SN - 0921-4526

VL - 350

SP - 45

EP - 47

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1-3

ER -

Critical small-angle scattering of polarised neutrons in MnSi

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Keywords

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