TY - JOUR

T1 - The spin chirality in MnSi single crystal probed by small angle scattering with polarized neutrons

AU - Okorokov, A. I.

AU - Grigoriev, S. V.

AU - Chetverikov, Yu O.

AU - Georgii, R.

AU - Böni, P.

AU - Eckerlebe, H.

AU - Pranzas, K.

AU - Roessli, B.

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, RFBR grants 00-02-16873, and 01-02-17286 and the Russian State Program “Neutron Research of Solids”.

PY - 2004/7/15

Y1 - 2004/7/15

N2 - The weak itinerant ferromagnet MnSi orders with a left-handed helical spin structure below TC = 29 K. The helicity with a vector m = [S 1× S2]/S2 along the crystallographic axis is realized by an antisymmetric Dzyaloshinski-Moriya interaction. The small angle diffraction study with polarized neutrons on a single MnSi crystal was performed within the temperature range from 10 K to TC and the magnetic field B from 1 to 350 mT. The single crystal was oriented in such a way that two axes and were set in a plane perpendicular to the incident beam. Four major diffraction peaks at ±q1 and ±q2 along the axes and four minor peaks at q = ±q1±q2 were observed. The intensity Ip = I(+/Po) + I(-P o), the polarization Pp = [I(+Po) -I(-P o)]/Ip and the position qp of the peaks were measured as a function of the temperature and the magnetic field. From intensity of the peaks the chiral critical exponent is obtained as β= 0.47 ±0.04.

AB - The weak itinerant ferromagnet MnSi orders with a left-handed helical spin structure below TC = 29 K. The helicity with a vector m = [S 1× S2]/S2 along the crystallographic axis is realized by an antisymmetric Dzyaloshinski-Moriya interaction. The small angle diffraction study with polarized neutrons on a single MnSi crystal was performed within the temperature range from 10 K to TC and the magnetic field B from 1 to 350 mT. The single crystal was oriented in such a way that two axes and were set in a plane perpendicular to the incident beam. Four major diffraction peaks at ±q1 and ±q2 along the axes and four minor peaks at q = ±q1±q2 were observed. The intensity Ip = I(+/Po) + I(-P o), the polarization Pp = [I(+Po) -I(-P o)]/Ip and the position qp of the peaks were measured as a function of the temperature and the magnetic field. From intensity of the peaks the chiral critical exponent is obtained as β= 0.47 ±0.04.

KW - Polarized neutrons

KW - Spin chirality

UR - http://www.scopus.com/inward/record.url?scp=15744391331&partnerID=8YFLogxK

U2 - 10.1016/j.physb.2004.03.079

DO - 10.1016/j.physb.2004.03.079

M3 - Article

AN - SCOPUS:15744391331

VL - 350

SP - e323-e326

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

IS - 1-3 SUPPL. 1

ER -