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High-field phase diagram of a chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4is studied by means of the ultrasound, dielectric, and magnetocaloric-effectmeasurements. These experimental techniques reveal two new phase transitions athigh fields, which have not been resolved by the previous magnetizationexperiments. Specifically, the c66 acoustic mode shows drastic changes withhysteresis with applied fields along the c axis, indicating a strongmagneto-elastic coupling. Combined with the cluster mean-field theory, wediscuss the origins of these phase transitions. By considering the chiral-twisteffect of Cu4O12 cupola units, which is inherent to the chiral crystalstructure, the phase diagram is reasonably reproduced. The agreement betweenthe experiment and theory suggests that this material is a unique quasitwo-dimensional spin system with competing exchange interactions and chirality,leading to the rich phase diagram.

High-field phase diagram of the chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4