This title appears in the Scientific Report :
2016
Please use the identifier:
http://hdl.handle.net/2128/13064 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.94.174403 in citations.
Hidden quantum phase transition in Mn$_{1−x}$ Fe$_{x}$ Ge evidenced by small-angle neutron scattering
Hidden quantum phase transition in Mn$_{1−x}$ Fe$_{x}$ Ge evidenced by small-angle neutron scattering
The magnetic system of the Mn1−xFexGe solid solution is ordered in a spiral spin structure in the whole concentration range of x∈[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 stru...
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Personal Name(s): | Altynbaev, E. (Corresponding author) |
---|---|
Siegfried, S.-A. / Moskvin, E. / Menzel, D. / Dewhurst, C. / Heinemann, A. / Feoktystov, A. / Fomicheva, L. / Tsvyashchenko, A. / Grigoriev, S. | |
Contributing Institute: |
Streumethoden; PGI-4 Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Physical Review B Physical review / B, 94 94 (2016 2016) 17 17, S. 174403 174403 |
Imprint: |
Woodbury, NY
Inst.
2016
|
DOI: |
10.1103/PhysRevB.94.174403 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) FRM II / MLZ |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.94.174403 in citations.
The magnetic system of the Mn1−xFexGe solid solution is ordered in a spiral spin structure in the whole concentration range of x∈[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 x∈[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. |