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

2 Sitaatiot (Scopus)
144 Lataukset (Pure)

Abstrakti

The magnetic phase diagram of a spin-12 chain antiferromagnet Sr2CuO3 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 Néel 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)2469-995010.1103/PhysRevB.95.020411] 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-12 chains.

AlkuperäiskieliEnglanti
Artikkeli201107
Sivumäärä5
JulkaisuPhysical Review B
Vuosikerta101
Numero20
DOI - pysyväislinkit
TilaJulkaistu - 15 toukok. 2020
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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