Research output: Contribution to journal › Article › peer-review
Hidden quantum phase transition in Mn1-xFexGe evidenced by small-angle neutron scattering. / Altynbaev, E.; Siegfried, S. A.; Moskvin, E.; Menzel, D.; Dewhurst, C.; Heinemann, A.; Feoktystov, A.; Fomicheva, L.; Tsvyashchenko, A.; Grigoriev, S.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 94, No. 17, 174403, 2016.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Hidden quantum phase transition in Mn1-xFexGe evidenced by small-angle neutron scattering
AU - Altynbaev, E.
AU - Siegfried, S. A.
AU - Moskvin, E.
AU - Menzel, D.
AU - Dewhurst, C.
AU - Heinemann, A.
AU - Feoktystov, A.
AU - Fomicheva, L.
AU - Tsvyashchenko, A.
AU - Grigoriev, S.
N1 - Funding Information: The work was supported by the Russian Foundation of Basic Research (Grants No. 14-22-01073 and No. 14-02-00001) and the special program of the Department of Physical Science, Russian Academy of Sciences Publisher Copyright: ©2016 American Physical Society. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2016
Y1 - 2016
N2 - The magnetic system of the Mn1-xFexGe solid solution is ordered in a spiral spin structure in the whole concentration range of [0÷1]. The close inspection of the small-angle neutron-scattering data reveals the quantum phase transition from the long-range ordered to short-range ordered helical structure upon increase of Fe concentration at [0.25÷0.4]. The short-range order (SRO) of the helical structure is identified as a Lorentzian contribution, while long-range order is associated with the Gaussian contribution into the scattering profile function. The scenario of the quantum phase transition with x as a driving parameter is similar to the thermal phase transition in pure MnGe. The quantum nature of the SRO is proved by the temperature-independent correlation length of the helical structure at low- and intermediate-temperature ranges with remarkable decrease above certain temperature TQ. We suggest the x-dependent modification of the effective Ruderman-Kittel-Kasuya-Yosida exchange interaction within the Heisenberg model of magnetism to explain the quantum critical regime in Mn1-xFexGe.
AB - The magnetic system of the Mn1-xFexGe solid solution is ordered in a spiral spin structure in the whole concentration range of [0÷1]. The close inspection of the small-angle neutron-scattering data reveals the quantum phase transition from the long-range ordered to short-range ordered helical structure upon increase of Fe concentration at [0.25÷0.4]. The short-range order (SRO) of the helical structure is identified as a Lorentzian contribution, while long-range order is associated with the Gaussian contribution into the scattering profile function. The scenario of the quantum phase transition with x as a driving parameter is similar to the thermal phase transition in pure MnGe. The quantum nature of the SRO is proved by the temperature-independent correlation length of the helical structure at low- and intermediate-temperature ranges with remarkable decrease above certain temperature TQ. We suggest the x-dependent modification of the effective Ruderman-Kittel-Kasuya-Yosida exchange interaction within the Heisenberg model of magnetism to explain the quantum critical regime in Mn1-xFexGe.
KW - Helical magnetic structure
KW - MnGe
KW - Manganese Germanium
KW - Quantum phase transition
KW - Magnetic ordering
KW - Fluctuations
UR - http://www.scopus.com/inward/record.url?scp=84994589169&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.94.174403
DO - 10.1103/PhysRevB.94.174403
M3 - Article
VL - 94
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 17
M1 - 174403
ER -
ID: 7618627