Incommensurate Magnetic Structures in Triangular Antiferromagnet CsCuCl₃

Abstract

The helical magnet CsCuC1, in an applied field higher than the critical field is shown to have sinusoidal phase with linear polarization of spins. The new intermediate phase is due to a conical-point instability caused by weak dipole interactions. Therefore in different temperature ranges two modulated structures are actually realized. Results found theoretically are in good agreement with the experimental data. nOKa3aH0, YTO BO BHeZUHeM IIOJIe BbIIIIe KpElTHseCKOrO B reJIHIEOPiAaJIbHOM MarlieTElHe CSCUcl, BO3MOECHO IIOHBJIeHHe CHHyCOH~aJIbHOfi $la361 C JIElHeaHOt llOJIFfpH3aqHefi CIIH-HOB. Hosan llpOMeECyTOsHaH @a3a 06yc~10B~IeHa HeYCTOfiYHBOCTbH) KOHEl YeCKOH T O W 3 3 M3-3a cna601-0 ,li€XllOJIbHOrO B3aHMO~eBCTBHR. n O 3 T O M Y B pa3JIM4HbIX TeMlIepaTypHbIX BHTepBaJIaX @ICTLIYeCKM peaJIH3yIOTCFI ABe MOAyJIHpOBaHHbIe CTpYICTYPbI. HatAeHHbIe TeOpeTElYeCKH pe3yJIbTaTbI XOpOUIO COrJIaCYIoTCFf C 3KCIIepElMeHTaJIbHbIMM HaHHbIMEl.

On the field-dependent magnetic structures of CsCuCl3

“…The most interesting finding in recent years has been the evidence of phase transitions of the magnetic structure in strong external magnetic fields (Nojiri et a1 1988, Fedoseeva et al 1985, Gekht et al 1989. In the magnetization, anomalies have been seen at 1.1 K near 12 T: Noriji et al found a small vertical step in M versus H for H parallel to c, which points to a sudden flop-like change, while for H in the ab plane they found a short plateau indicating a smooth phase transition.…”