Abstract
We report the physical properties of EuPtIn4 single crystalline platelets grown by the In-flux technique. This compound crystallizes in the orthorhombic Cmcm structure with lattice parameters a=4.542(1)A., b=16.955(2)A. and c=7.389(1)A.. Measurements of magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) reveal that EuPtIn4 is a metallic Curie–Weiss paramagnet at high temperatures with an effective moment of μeff≈7.8(1)μB due to divalent Eu ions. At low temperatures, antiferromagnetic (AFM) ordering is observed at TN=13.3K followed by a successive anomaly at T⁎=12.6K. In addition, within the magnetic state, a spin-flop transition is observed with Hc~2.5T at T=1.8K when the magnetic field is applied along the ac-plane. In the paramagnetic state, a single divalent Eu2+ Dysonian ESR line with a Korringa relaxation rate of b=4.1(2)Oe/K is observed. Interestingly, even at high temperatures, both ESR linewidth and electrical resistivity reveal a similar anisotropy. We discuss a possible common microscopic origin for the observed anisotropy in these physical quantities likely associated with an anisotropic magnetic interaction between Eu2+ 4f electrons mediated by conduction electrons.
Highlights
Low-dimensional rare-earth based intermetallic compounds exhibit a variety of interesting phenomena including Ruderman– Kittel–Kasuya–Yoshida (RKKY) magnetic interaction, heavy fermion (HF) behavior, unconventional superconductivity, crystalline electrical field (CEF) and Fermi surface (FS) effects [1,2]
From the CW magnetic susceptibility fits for T 4 10TN we obtained for both directions a CW temperature of θCW % À15ð1Þ K and an effective moment of μeff % 7:8ð1Þ μB for Eu2 þ in EuPtIn4, which is in good agreement with the theoretical value (7:94 μB)
Isothermal magnetization curves as a function of the applied magnetic field at 1.8 K are shown in the inset of Fig. 2b
Summary
Low-dimensional rare-earth based intermetallic compounds exhibit a variety of interesting phenomena including Ruderman– Kittel–Kasuya–Yoshida (RKKY) magnetic interaction, heavy fermion (HF) behavior, unconventional superconductivity, crystalline electrical field (CEF) and Fermi surface (FS) effects [1,2]. The field-dependent magnetic susceptibility shows an AFM ordering at TN 1⁄4 13:3 K followed by a successive transition at Tn 1⁄4 12:8 K Both electrical resistivity and ESR linewidth are found to be anisotropic even at high temperatures, suggesting the presence of an anisotropic magnetic interaction between the Eu2 þ 4f electrons mediated by conduction electrons (ce). Such anisotropy is possibly caused by the low dimensionality of [PtIn4] polyanionic networks surrounding the Eu2 þ ions
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