Back to Search
Start Over
Critical behavior of the single-crystal helimagnet MnSi.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Jan2015, Vol. 91 Issue 2, p024403-1-024403-7. 7p. - Publication Year :
- 2015
-
Abstract
- The critical behavior of the single-crystal helimagnet MnSi is investigated by means of bulk dc magnetization at the boundary between the conical state and paramagnetic phase. We obtain the critical exponents (β = 0.242 ± 0.006, γ = 0.915 ± 0.003, and δ = 4.734 ± 0.006), where the self-consistency and reliability are verified by the Widom scaling law and the scaling equation. The critical exponents of MnSi belong to the universality class of tricritical mean-field theory, which unambiguously indicates a tricritical phenomenon at the boundary between the first-order phase transition and the second-order one induced by the external magnetic field. The tricritical point (TCP) is determined as HTCP ≈ 3200 Oe at the critical temperature, consistent with the previous report [A. Bauer, M. Garst, and C. Pfleiderer, Phys. Rev. Lett. 110, 177207 (2013)]. The critical behavior suggests a long-range magnetic coupling with the exchange distance decaying as J(r) ≈ r -4.3 in MnSi. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 91
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 101508188
- Full Text :
- https://doi.org/10.1103/PhysRevB.91.024403