Unexpected magnetic phase in the weakly ordered spin-1/2 chain cuprate Sr2CuO3

E. G. Sergeicheva, S. S. Sosin*, D. Gorbunov, S. Zherlitsyn, G. D. Gu, I. A. Zaliznyak

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

The magnetic phase diagram of a spin-1/2 chain antiferromagnet Sr(2)CuO(3 )is studied by an ultrasound phase-sensitive detection technique. The system is in the extreme proximity of the Luttinger-liquid quantum-critical point and we observe an unusually strong effect of magnetic field, which is very weak compared to the in-chain interaction, on the Neel ordering temperature. Inside the ordered phase, we detect an unexpected, field-induced continuous phase transition. The transition is accompanied by softening of magnetic excitation observed by electron-spin resonance, which in previous work [E. G. Sergeicheva et al., Phys. Rev. B 95, 020411(R) (2017)] was associated with a longitudinal (amplitude) mode of the order parameter. These results suggest a transition from a transverse collinear antiferromagnet to an amplitude-modulated spin-density-wave phase in a very weak magnetic field, which is unexpected for a system of weakly coupled Heisenberg spin-1/2 chains.

AlkuperäiskieliEnglanti
Artikkeli201107
Sivumäärä5
JulkaisuPhysical Review B
Vuosikerta101
Numero20
DOI - pysyväislinkit
TilaJulkaistu - 15 toukokuuta 2020
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

Siteeraa tätä

Sergeicheva, E. G., Sosin, S. S., Gorbunov, D., Zherlitsyn, S., Gu, G. D., & Zaliznyak, I. A. (2020). Unexpected magnetic phase in the weakly ordered spin-1/2 chain cuprate Sr2CuO3. Physical Review B, 101(20), [201107]. https://doi.org/10.1103/PhysRevB.101.201107