| Autor: |
Boya, K., Nam, K., Kargeti, K., Jain, A., Kumar, R., Panda, S. K., Yusuf, S. M., Paulose, P. L., Voma, U. K., Kermarrec, E., Kim, Kee Hoon, Koteswararao, B. |
| Předmět: |
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| Zdroj: |
APL Materials; 10/1/2022, Vol. 10 Issue 10, p1-8, 8p |
| Abstrakt: |
A quantum spin-liquid is a spin disordered state of matter in which spins are strongly correlated and highly entangled with low-energy excitations. It has been often found in two-dimensional S = ½, highly frustrated spin networks but rarely observed in three-dimensional (3D) frustrated quantum magnets. Here, KSrFe2(PO4)3, forming a complicated 3D frustrated lattice with a spin moment S = 5/2, is investigated by thermodynamic, neutron diffraction measurements and electronic structure calculations. Despite the relatively sizable Curie–Weiss temperature θCW = −70 K, a conventional magnetic long-range order is confirmed to be absent down to 0.19 K. The magnetic heat capacity data follow the power-law behavior at the lowest temperature region, supporting gapless excitations in a 3D spin-liquid state. Strong geometrical spin frustration responsible for the spin-liquid feature is understood as originating from the almost comparable five competing nearest-neighbor antiferromagnetic exchange interactions, which form the complicated 3D frustrated spin network. All these results suggest that the compound KSrFe2(PO4)3, representing a unique 3D spin frustrated network, could be a rare example of forming a gapless spin-liquid state even with a large spin moment of S = 5/2. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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