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Pis'ma v Zh. Èksper. Teoret. Fiz., 2006, Volume 83, Issue 11, Pages 568–572 (Mi jetpl1315)  

This article is cited in 4 scientific papers (total in 4 papers)

FIELDS, PARTICLES, AND NUCLEI

Investigation of the chiral structure of the Y/Dy multilayer system by the method of the small-angle scattering of polarized neutrons

S. V. Grigor'eva, A. I. Okorokova, Yu. O. Chetverikova, D. Yu. Chernysheva, H. Eckerlebeb, K. Pranzasb, A. Schreyerb

a Petersburg Nuclear Physics Institute, Russian Academy of Sciences
b GKSS Forschungszentrum, 21502 Geesthacht, Germany

Abstract: The magnetic spiral structure of a Y/Dy sample has been investigated for temperatures from 30 to 190 K by the method of the small-angle scattering of polarized neutrons. The sample is a sequence of layers Y50nm [Dy4.3nm /Y2.8nm ]350/Y234nm /Nd200nm Al2O3 (substrate) that is grown as a single crystal with the [001] axis of the hexagonal lattice, which is perpendicular to the layer plane. The experiments demonstrate the appearance of the magnetic peak below T N = 165.4 K, which is associated with the helicoidal phase, and the helicoid coherence length is larger than the layer thickness of the Y/Dy layer. The use of polarized neutrons allows the separation of the polarization-independent and polarization-independent components of magnetic scattering. The polarization-independent component of the magnetic neutron cross section is proportional to magnetization squared ⟨;S Z 2, whereas the polarization-dependent component is proportional to the average chirality of the system ⟨;C⟩ = ⟨;[·S 1 × S 2]⟩. The critical exponents βC = 1.02(1) and β = 0.39(1) have been determined for the average chirality and magnetization, respectively. The magnetization critical exponent β for Dy/Y coincides with the exponent obtained for Dy bulk samples. The difference βC − 2β = 0.24(2) shows that the chirality can be a component of the order parameter that is independent of magnetization. This experiment corroborates the results that were obtained for the critical chirality in Ho and were reported in Phys. Rev. B 64, 100402(R) (2001).

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English version:
Journal of Experimental and Theoretical Physics Letters, 2006, 83:11, 478–482

Bibliographic databases:

PACS: 61.12.Ex, 75.40.-s
Received: 24.04.2006

Citation: S. V. Grigor'ev, A. I. Okorokov, Yu. O. Chetverikov, D. Yu. Chernyshev, H. Eckerlebe, K. Pranzas, A. Schreyer, “Investigation of the chiral structure of the Y/Dy multilayer system by the method of the small-angle scattering of polarized neutrons”, Pis'ma v Zh. Èksper. Teoret. Fiz., 83:11 (2006), 568–572; JETP Letters, 83:11 (2006), 478–482

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    This publication is cited in the following articles:
    1. Grigoriev S.V., Chetverikov Yu.O., Lott D., Schreyer A., Physical Review Letters, 100:19 (2008), 197203  crossref  adsnasa  isi  elib  scopus
    2. Haraldsen J.T., Fishman R.S., Physical Review B, 81:2 (2010), 020404  crossref  adsnasa  isi  elib  scopus
    3. Tarnavich V.V., Lott D., Mattauch S., Oleshkevych A., Kapaklis V., Grigoriev S.V., Phys. Rev. B, 89:5 (2014), 054406  crossref  isi  elib  scopus
    4. Tarnavich V., Tartakovskaya E., Chetverikov Yu., Golub V., Lott D., Chernenkov Yu., Devishvili A., Ukleev V., Kapaklis V., Oleshkevych A., Fedorov V., Bairamukov V., Vorobiev A., Grigoriev S., Phys. Rev. B, 96:1 (2017), 014415  crossref  isi  scopus
  •       Pis'ma v Zhurnal ksperimental'noi i Teoreticheskoi Fiziki
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