Transition from one-dimensional antiferromagnetism to three-dimensional antiferromagnetic order in single-crystalline CuSb2O6

Abstract

Measurements of magnetic susceptibility, heat capacity and thermal expansion are reported for single crystalline CuSb2O6 in the temperature range 5 < T < 350 K. The magnetic susceptibility exhibits a broad peak centered near 60 K that is typical of one-dimensional antiferromagnetic compounds. Long-range antiferromagnetic order at TN = 8.7 K is accompanied by an energy gap (∆ = 17.48(6) K). This transition represents a crossover from one-to three-dimensional antiferromagnetic behavior. Both heat capacity and the thermal expansion coefficients exhibit distinct jumps at TN , which are similar to those observed at the normal-superconducting phase transition in a superconductor. This behavior is quite unusual, and is presumably associated with a Spin-Peierls transition occurring as a result of three-dimensional phonons coupling with Jordan-Wigner-transformed Fermions.

Torque magnetometry study of magnetically ordered state and spin reorientation in the quasi-one-dimensionalS=12Heisenberg antiferromagnetCuSb2O6Herak1, Žilić2, Čalogović3 et al. 2015Phys. Rev. B9040View full textAdd to dashboardCite

“…For one sample of CuSb 2 O 6 it was recently reported that in the AFM ordered state easy axis and spin flop was observed for both a and b directions [12]. Indeed, the reported decrease of susceptibility along both a and b axis in that sample was comparable in magnitude corroborating this claim.…”

“…The orientation of (7) • , in good agreement with previously published data [1]. Presence of multiple twins, reported by other authors [2][3][4][12][13][14], was also observed in our data.…”

“…Our study of magnetic anisotropy of magnetically ordered state of CuSb 2 O 6 was motivated by different reports on the direction of the easy axis in this system [5,[8][9][10]12]. Torque magnetometry is sensitive to magnetic susceptibility anisotropy, see Eq.…”

“…Large decrease of susceptibility characteristically observed when magnetic field is applied along the easy axis has been reported for b axis direction [4,11], a axis direction [3], and even for both directions [9,12,13]. Recent report on single crystal measurements of magnetic susceptibility showed that significant decrease of susceptibility below T N and spin flop transition at H SF = 1.25 T is observed when magnetic field is applied along both the a and b axis, suggesting that both a and b are the easy axes in CuSb 2 O 6 [12]. The magnetically ordered ground state of CuSb 2 O 6 is thus still not completely resolved.…”

“…Using χ m 1 = 1.99 · 10 −3 emu/mol, χ m 2 = 2.0 · 10 −4 emu/mol and χ m 3 = 2.39 · 10 −3 emu/mol gives χ a * = 2.16 · 10 −3 emu/mol, χ b = 2.0 · 10 −4 emu/mol, χ c = 2.22 · 10 −3 emu/mol and χ ac = ∓2 · 10 −4 emu/mol, where − and + are signs for twins I and II, respectively. We then search for correct values of anisotropy constants K 1 and K ′ 1 by calculating the dependence of magnetization on magnetic field and by finding values of K 1 and K ′ 1 which reproduce the value of the spin flop field H SF ≈ 1.25 T reported in literature from magnetization [4,10,12] and ESR measurements [4]. Using the following values for anisotropy constants K 1 = 5 · 10 4 erg/mol and K ′ 1 = 2.21·10 5 erg/mol gives the dependence of magnetization on magnetic field shown in Fig.…”