Low Temperature Physics: 47, 948 (2021); https://doi.org/10.1063/10.0006575
Fizika Nizkikh Temperatur: Volume 47, Number 11 (November 2021), p. 1034-1038 ( to contents , go back )
Electric field- and strain-induced quantum phase transitions in a spin chain
A. A. Zvyagin
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
Received June 29, 2021, published online September 24, 2021
The effect of the external electric field and/or the external strain on the low-temperature behavior of the quantum spin chain model is studied. The external electric field or the strain can cause the quantum magnetic structural phase transition between two magnetically ordered phases with different order parameters. Such a quantum critical point can be observed in the special behavior of the low-temperature specific heat: At the critical value the low-temperature specific heat manifests linear in temperature behavior instead of the exponentially small one for other values of the field. The magnetic susceptibility also manifests the special behavior, in which quantum phase transitions are revealed.
Key words: quantum spin chain, electric field, external strain.