Magnetic field dependence of nonlinear magnetic response and tricritical point in the monoaxial chiral helimagnet Cr1/3NbS2

We present a comprehensive study of the magnetization dynamics and phase evolution in the chiral helimagnet Cr1/3NbS2, which realizes a chiral soliton lattice (CSL). The magnetic field dependence of the ac magnetic response is analyzed for the first five harmonic components, Mnω(H)(n=1–5), using a p...

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Bibliographic Details
Published in:Physical review. B 2018-06, Vol.97 (21)
Main Authors: Clements, E M, Das, Raja, Phan, Manh-Huong, Li, Ling, Keppens, Veerle, Mandrus, David, Osofsky, Michael, Srikanth, Hariharan
Format: Article
Language:English
Subjects:
Critical field (superconductivity)
Crossovers
Curie temperature
Ferromagnetism
Helicity
Magnetic domains
Magnetic fields
Magnetism
Nonlinear response
Phase diagrams
Phase transitions
Skewed distributions
Temperature dependence
Time dependence
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Summary:We present a comprehensive study of the magnetization dynamics and phase evolution in the chiral helimagnet Cr1/3NbS2, which realizes a chiral soliton lattice (CSL). The magnetic field dependence of the ac magnetic response is analyzed for the first five harmonic components, Mnω(H)(n=1–5), using a phase sensitive measurement over a frequency range, f=11–10000Hz. At a critical field, the modulated CSL continuously evolves from a helicity-rich to a ferromagnetic domain-rich structure, where the crossover is revealed by the onset of an anomalous nonlinear magnetic response that coincides with extremely slow dynamics. The behavior is indicative of the formation of a spatially coherent array of large ferromagnetic domains, which relax on macroscopic time scales. The frequency dependence of the ac magnetic loss displays an asymmetric distribution of relaxation times across the highly nonlinear CSL regime, which shift to shorter time scales with increasing temperature. We experimentally resolve the tricritical point at TTCP in a temperature regime above the ferromagnetic Curie temperature which separates the linear and nonlinear magnetic regimes of the CSL at the phase transition. A comprehensive phase diagram is constructed which summarizes the features of the field and temperature dependence of the magnetic crossovers and phase transitions in Cr1/3NbS2.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.214438