TY - JOUR
T1 - Magnetically ordered state and crystalline-electric-field effects in SmBe13
AU - Hidaka, Hiroyuki
AU - Yamazaki, Seigo
AU - Shimizu, Yusei
AU - Miura, Naoyuki
AU - Tabata, Chihiro
AU - Yanagisawa, Tatsuya
AU - Amitsuka, Hiroshi
N1 - Funding Information:
The present research was supported by JSPS KAKENHI Grant Numbers JP20224015(S), JP25400346(C), JP26400342(C), JP15H05882, and JP15H05885 (J-Physics).
Publisher Copyright:
©2017 The Physical Society of Japan.
PY - 2017/7/15
Y1 - 2017/7/15
N2 - The physical properties of single-crystalline SmBe13 with a NaZn13-type cubic structure have been studied by electrical resistivity (ρ), specific heat (C), and magnetization (M) measurements in magnetic fields of up to 9 T. The temperature (T) dependence of ρ shows normal metallic behavior without showing the Kondo −ln T behavior, suggesting the weak hybridization effect in this system. Analyses of the temperature dependence of C suggest that the Sm ions of this compound are trivalent and that the crystalline-electric-field (CEF) ground state is a Γ8 quartet with a first-excited state of a Γ7 doublet located at the energy scale of ~90 K. Mean-field calculations based on the suggested CEF level scheme can reasonably well reproduce the T dependence of magnetic susceptibility (χ) below ~70 K. These results in the paramagnetic state strongly indicate that the 4 f electrons are well localized with the Sm3+ configuration. At low temperatures, the 4 f electrons undergo a magnetic order at TM ~ 8.3 K, where χ (T) shows an antiferromagnetic-like cusp anomaly. From the positive Curie–Weiss temperature obtained from the mean-field calculations and from a constructed magnetic phase diagram with multiple regions, we discussed the magnetic structure of SmBe13 below TM, by comparing with other isostructural MBe13 compounds showing helical-magnetic ordering.
AB - The physical properties of single-crystalline SmBe13 with a NaZn13-type cubic structure have been studied by electrical resistivity (ρ), specific heat (C), and magnetization (M) measurements in magnetic fields of up to 9 T. The temperature (T) dependence of ρ shows normal metallic behavior without showing the Kondo −ln T behavior, suggesting the weak hybridization effect in this system. Analyses of the temperature dependence of C suggest that the Sm ions of this compound are trivalent and that the crystalline-electric-field (CEF) ground state is a Γ8 quartet with a first-excited state of a Γ7 doublet located at the energy scale of ~90 K. Mean-field calculations based on the suggested CEF level scheme can reasonably well reproduce the T dependence of magnetic susceptibility (χ) below ~70 K. These results in the paramagnetic state strongly indicate that the 4 f electrons are well localized with the Sm3+ configuration. At low temperatures, the 4 f electrons undergo a magnetic order at TM ~ 8.3 K, where χ (T) shows an antiferromagnetic-like cusp anomaly. From the positive Curie–Weiss temperature obtained from the mean-field calculations and from a constructed magnetic phase diagram with multiple regions, we discussed the magnetic structure of SmBe13 below TM, by comparing with other isostructural MBe13 compounds showing helical-magnetic ordering.
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U2 - 10.7566/JPSJ.86.074703
DO - 10.7566/JPSJ.86.074703
M3 - Article
AN - SCOPUS:85022227759
VL - 86
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 7
M1 - 074703
ER -