Abstract
Single crystals of ${\mathrm{Eu}}_{3}{\mathrm{InAs}}_{3}$ have been successfully synthesized by indium flux reactions. ${\mathrm{Eu}}_{3}{\mathrm{InAs}}_{3}$ crystallizes in the ${\mathrm{Ca}}_{3}\mathrm{Al}{\mathrm{As}}_{3}$-type structure with an orthorhombic space-group $Pnma$. Theoretical calculations indicate that ${\mathrm{Eu}}_{3}{\mathrm{InAs}}_{3}$ is a semiconductor with a direct band gap of 0.3 eV. ${\mathrm{Eu}}_{3}{\mathrm{InAs}}_{3}$ has large negative Seebeck coefficients in the range of 300--450 \ensuremath{\mu}V/K at room temperature. ${\mathrm{Eu}}_{3}{\mathrm{InAs}}_{3}$ displays two antiferromagnetic transitions (${T}_{N1}=13$ and ${T}_{N2}=10$ K) for both $H\ensuremath{\parallel}b$ and $H\ensuremath{\perp}b$ which can be suppressed by magnetic fields. At 2 K, field-induced ferromagnetic states are reached for both $H\ensuremath{\parallel}b$ and $H\ensuremath{\perp}b$. Particularly, the $H\ensuremath{\parallel}b$ magnetization curves show a plateau at 1/3 of the saturated magnetization and an anomaly at 2/3 of the saturated magnetization. ${\mathrm{Eu}}_{3}{\mathrm{InAs}}_{3}$ is a Zintl phase material showing a 1/3 magnetization plateau here.
Highlights
The classical Zintl phase was discovered in the 1930s as valence-specific compounds formed between electropositive elements, such as alkali metal or alkali-earth metal and the main groups 13–16 elements [1,2]
Single crystals of Eu3InAs3 have been successfully synthesized by indium flux reactions
Our paper shows that Eu3InAs3 has large negative Seebeck coefficients similar to that reported in Ref. [21]
Summary
The classical Zintl phase was discovered in the 1930s as valence-specific compounds formed between electropositive elements, such as alkali metal or alkali-earth metal and the main groups 13–16 elements [1,2]. M3T Pn3 Zintl phase compounds, where M represents alkal- earth metal or europium, T represents In or Al, and Pn represents As or P elements, show high Seebeck coefficients and have the potential for thermoelectric application. Eu3InAs3 has been reported to have an unusually large negative Seebeck coefficient (absolute value >400 μV K−1 at 700 K) and a paramagnetic behavior down to 5 K [21]. In comparison to other europiumcontaining Zintl phase materials displaying rich magnetic behaviors, a paramagnetism down to 5 K for Eu3InAs3 is unexpected. Our paper shows that Eu3InAs3 has large negative Seebeck coefficients similar to that reported in Ref. Our magnetic measurements indicate that Eu3InAs3 shows successive magnetic orders and field-induced metamagnetic transitions, the magnetization curves show plateaus at 1/3 of the saturation magnetization (MS) and anomalies at 2/3 of the MS.
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