期刊
PHYSICAL REVIEW B
卷 99, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.094307
关键词
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资金
- National Key Research and Development Program of China [2017YFA0303600, 2016YFA0300303, 2017YFA0302901]
- National Natural Science Foundation of China [11574383, 11774408, 11774399]
- Strategic Priority Research Program of CAS [XDB30000000]
- Beijing Natural Science Foundation [4191003]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1826]
- CAS Interdisciplinary Innovation Team
The similarities to cuprates make iridates an interesting potential platform for investigating superconductivity. Equally attractive are their puzzling complex intrinsic interactions. Here, we report an ultrafast optical spectroscopy investigation of a coherent phonon mode in Sr3Ir2O7, a bilayer Ruddlesden-Popper perovskite iridate. An anomaly in the A(1g) optical phonon (nu = 4.4 THz) is unambiguously observed below the Neel temperature (T-N), which we attribute to pseudospin-lattice coupling (PLC). Significantly, we find that PLC is the dominant interaction at low temperature, and we directly measure the PLC coefficient to be lambda = 150 +/- 20 cm(-1), which is two orders of magnitude higher than that in manganites (<2.4 cm(-1)) and comparable to that in CuO (50 cm(-1), the strongest PLC or spin-lattice coupling (SLC) previously known). Moreover, we find that the strong PLC induces an anisotropic negative thermal expansion. Our findings highlight the key role of PLC in iridates and uncovers another intriguing similarity to cuprates.
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