Unstable Shastry-Sutherland phase in Ce${}_2$Pd${}_2$Sn

Abstract

Thermal ($C_P$), magnetic ($M$ and ${\chi }_{ac}$) and transport ($\rho$) measurements on Ce${}_2$Pd${}_2$Sn are reported. High temperature properties are well described by the presence of two excited crystal field levels at $(65\pm 5)$K and $(230\pm 20)$K, with negligible hybridization (Kondo) effects. According to literature, two transitions were observed at $T_M=4.8$K and $T_C=2.1$K respectively. The upper transition cannot be considered as a standard anti-ferromagnetic because of frustration effects in a triangular network of Ce-atoms and the positive sign of the paramagnetic temperature ${\theta }_P^{LT}=4.4$K. The nature of the this intermediated phase is described accounting for the formation of ferromagnetic (F) Ce-dimers disposed in a quasi-2D square lattice, resembling a Shastry-Sutherland pattern. According to hysteretic features in $\rho (T)$ and ${\chi }_{ac}(T)$, the lower F-transition is of first order, with $C_P(T<T_C)$ revealing a gap of anisotropy $E_g\approx 7$K.

7 pages, 6 figures

References in corpus (2)

• Yb${}_2$Pt${}_2$Pb: Magnetic frustration in the Shastry-Sutherland lattice
• Quantum Criticality in doped CePd_1-xRh_x Ferromagnet

Cited by in corpus (5)

• Spin Liquids and Antiferromagnetic Order in the Shastry-Sutherland-Lattice Yb${}_2$Pt${}_2$Pb
• Suppression of the Shastry-Sutherland phase in Ce${}_2$Pd${}_2$Sn at a field induced critical point
• Electron concentration effects on the Shastry-Sutherland phase stability in Ce_{2-x}Pd_{2+y}In_{1-z} solid solutions
• Suppression of Shastry-Sutherland phase driven by electronic concentration reduction in magnetically frustrated Ce${}_2$Pd${}_2$Sn${}_{1-y}$In${}_y$ alloys
• Tri-critical point and suppression of the Shastry-Sutherland phase in Ce${}_2$Pd${}_2$Sn by Ni doping