%0 Journal Article %1 PhysRevB.108.054434 %A Nomura, Toshihiro %A Kato, Yasuyuki %A Motome, Yukitoshi %A Miyake, Atsushi %A Tokunaga, Masashi %A Kohama, Yoshimitsu %A Zherlitsyn, Sergei %A Wosnitza, Joachim %A Kimura, Shojiro %A Katsuyoshi, Tsukasa %A Kimura, Tsuyoshi %A Kimura, Kenta %D 2023 %I American Physical Society %J Phys. Rev. B %K b %N 5 %P 054434 %R 10.1103/PhysRevB.108.054434 %T High-field phase diagram of the chiral-lattice antiferromagnet Sr(TiO)Cu$_4$(PO$_4$)$_4$ %U https://link.aps.org/doi/10.1103/PhysRevB.108.054434 %V 108 %X We studied the high-field phase diagram of a chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4 by means of ultrasound, dielectric, and magnetocaloric-effect measurements. These experimental techniques reveal two new phase transitions at high fields, which have not been resolved by previous magnetization experiments. Specifically, the c66 acoustic mode shows drastic changes with hysteresis for magnetic fields applied along the c axis, indicating a strong magnetoelastic coupling. Combined with cluster mean-field theory, we discuss the origin of these phase transitions. By considering the chiral-twist effect of Cu4O12 cupola units, which is inherent to the chiral crystal structure, the phase diagram is reasonably reproduced. The agreement between experiment and theory suggests that this material is a unique quasi-two-dimensional spin system with competing exchange interactions and chirality, leading to a rich phase diagram.

@article{PhysRevB.108.054434, abstract = {We studied the high-field phase diagram of a chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4 by means of ultrasound, dielectric, and magnetocaloric-effect measurements. These experimental techniques reveal two new phase transitions at high fields, which have not been resolved by previous magnetization experiments. Specifically, the c66 acoustic mode shows drastic changes with hysteresis for magnetic fields applied along the c axis, indicating a strong magnetoelastic coupling. Combined with cluster mean-field theory, we discuss the origin of these phase transitions. By considering the chiral-twist effect of Cu4O12 cupola units, which is inherent to the chiral crystal structure, the phase diagram is reasonably reproduced. The agreement between experiment and theory suggests that this material is a unique quasi-two-dimensional spin system with competing exchange interactions and chirality, leading to a rich phase diagram.}, added-at = {2023-09-13T13:54:25.000+0200}, author = {Nomura, Toshihiro and Kato, Yasuyuki and Motome, Yukitoshi and Miyake, Atsushi and Tokunaga, Masashi and Kohama, Yoshimitsu and Zherlitsyn, Sergei and Wosnitza, Joachim and Kimura, Shojiro and Katsuyoshi, Tsukasa and Kimura, Tsuyoshi and Kimura, Kenta}, biburl = {https://www.bibsonomy.org/bibtex/24e616d867e3fffbca38abeddb7ea36ef/ctqmat}, day = 23, description = {Phys. Rev. B 108, 054434 (2023) - High-field phase diagram of the chiral-lattice antiferromagnet $\mathrm{Sr}(\mathrm{TiO}){\mathrm{Cu}}_{4}({\mathrm{PO}}_{4}{)}_{4}$}, doi = {10.1103/PhysRevB.108.054434}, interhash = {5b10d342d95d09a607464052fe8690e2}, intrahash = {4e616d867e3fffbca38abeddb7ea36ef}, journal = {Phys. Rev. B}, keywords = {b}, month = {08}, number = 5, numpages = {11}, pages = 054434, publisher = {American Physical Society}, timestamp = {2023-10-31T11:12:19.000+0100}, title = {High-field phase diagram of the chiral-lattice antiferromagnet Sr(TiO)Cu$_{\mathbf{4}}$(PO$_{\mathbf{4}}$)$_{\mathbf{4}}$}, url = {https://link.aps.org/doi/10.1103/PhysRevB.108.054434}, volume = 108, year = 2023 }