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- W4384268454 abstract "Two triangular lattice antiferromagnets Sr$_3$Co(Nb,Ta)$_2$O$_9$ with an effective $j_{rm eff}=1/2$ of Co$^{2+}$ are synthesized and their magnetic properties are investigated via magnetization and heat capacity measurements. The leading in-plane antiferromagnetic exchange coupling is estimated to be $J/k_{rm B} simeq 4.7$ K and 5.8 K, respectively. Both the compounds feature two-step magnetic transitions at low temperatures [($T_{rm N1} simeq 1.47$ K and $T_{rm N2} simeq 1.22$ K) and ($T_{rm N1} simeq 0.88$ K and $T_{rm N2} simeq 0.67$ K), respectively], driven by weak easy-axis anisotropy. Under magnetic field Sr$_3$CoNb$_2$O$_9$ evinces a plateau at $1/3$ magnetization. Interestingly, the high field magnetization of Sr$_3$CoTa$_2$O$_9$ reveals an exotic regime (between $H_{rm S1}$ and $H_{rm S2}$), below the fully polarized state in which the heat capacity at low temperatures is governed by a power law ($C_{rm p} propto T^{alpha}$) with a reduced exponent $alpha simeq 2$. These results demonstrate an unusual field induced state with gapless excitations in the strongly frustrated magnet Sr$_3$CoTa$_2$O$_9$. The complete $T-H$ phase diagram is discussed for both the compounds." @default.
- W4384268454 created "2023-07-14" @default.
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- W4384268454 date "2023-07-12" @default.
- W4384268454 modified "2023-10-17" @default.
- W4384268454 title "Double magnetic transitions and exotic field induced phase in the triangular lattice antiferromagnets Sr$_3$Co(Nb,Ta)$_2$O$_9$" @default.
- W4384268454 doi "https://doi.org/10.48550/arxiv.2307.06219" @default.
- W4384268454 hasPublicationYear "2023" @default.
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