Cyclotron resonance in rare-earth monopnictides
Cyclotron resonance in rare-earth monopnictides
复制标题
稀土单磷化合物中的回旋共振
DOI：
10.1103/physrevb.71.075102
复制
发表时间：
2005
影响因子：
3.7
通讯作者：
M. Motokawa
中科院分区：
文献类型：
--
作者：
Makoto Yoshida;K. Koyama;A. Ochiai;M. Motokawa
Recently, we have developed equipment which can be used for both cyclotron resonance (CR) and electron spin resonance (ESR) measurements for studying $f$-electron systems. Using this equipment and preparing high-quality single crystals with a residual resistivity ratio of about 500, we have successfully observed CR signals in rare-earth monopnictides $RX\phantom{\rule{0.3em}{0ex}}(R=\mathrm{La},\mathrm{Ce},\mathrm{Pr},\mathrm{Gd},X=\mathrm{Sb},\mathrm{Bi})$. The purpose of this paper is to describe the development of our measurement system in detail and to reexamine our recent results of CR measurements on the single crystals of $RX$. And then, we discuss the origin of mass enhancement in this system by comparing the case of a strongly correlated $f$-electron system CeSb with the case of a nonmagnetic simple semimetal LaSb. The CR measurements have been performed in the temperature range from $1.4\phantom{\rule{0.3em}{0ex}}\mathrm{K}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}40\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and in the frequency range from $50\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}190\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$. We have observed CR signals in LaSb, LaBi, CeSb, PrSb, and GdSb. The cyclotron effective masses ${m}_{\mathit{CR}}^{*}$ determined by the CR measurements are compared with the masses ${m}_{\mathit{QO}}^{*}$ estimated by measurements of quantum oscillations and the masses ${m}_{\mathit{BC}}^{*}$ deduced from band structure calculations. The determined ${m}_{\mathit{CR}}^{*}$ of LaSb, LaBi, and GdSb is in the range of $(0.17\char21{}0.65){m}_{0}$. These values are reasonably consistent with the values of ${m}_{\mathit{QO}}^{*}$ and ${m}_{\mathit{BC}}^{*}$. This fact shows that both ${m}_{\mathit{CR}}^{*}$ and ${m}_{\mathit{QO}}^{*}$ mainly depend on the band structure if the interaction between conduction electrons and $f$ electrons is negligible. On the other hand, in the case of a strongly correlated $f$-electron system CeSb, ${m}_{\mathit{CR}}^{*}$ is in the range of $(0.26\char21{}1.5){m}_{0}$. These values are much larger than those of ${m}_{\mathit{BC}}^{*}$. This finding shows that ${m}_{\mathit{CR}}^{*}$, as well as ${m}_{\mathit{QO}}^{*}$, is considerably enhanced in CeSb. Our results indicate that the interband interaction is important for the mass enhancement of ${m}_{\mathit{CR}}^{*}$ in CeSb.
Recently, we have developed equipment which can be used for both cyclotron resonance (CR) and electron spin resonance (ESR) measurements for studying $f$-electron systems. Using this equipment and preparing high-quality single crystals with a residual resistivity ratio of about 500, we have successfully observed CR signals in rare-earth monopnictides $RX\phantom{\rule{0.3em}{0ex}}(R=\mathrm{La},\mathrm{Ce},\mathrm{Pr},\mathrm{Gd},X=\mathrm{Sb},\mathrm{Bi})$. The purpose of this paper is to describe the development of our measurement system in detail and to reexamine our recent results of CR measurements on the single crystals of $RX$. And then, we discuss the origin of mass enhancement in this system by comparing the case of a strongly correlated $f$-electron system CeSb with the case of a nonmagnetic simple semimetal LaSb. The CR measurements have been performed in the temperature range from $1.4\phantom{\rule{0.3em}{0ex}}\mathrm{K}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}40\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and in the frequency range from $50\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}190\phantom{\rule{0.3em}{0ex}}\mathrm{GHz}$. We have observed CR signals in LaSb, LaBi, CeSb, PrSb, and GdSb. The cyclotron effective masses ${m}_{\mathit{CR}}^{*}$ determined by the CR measurements are compared with the masses ${m}_{\mathit{QO}}^{*}$ estimated by measurements of quantum oscillations and the masses ${m}_{\mathit{BC}}^{*}$ deduced from band structure calculations. The determined ${m}_{\mathit{CR}}^{*}$ of LaSb, LaBi, and GdSb is in the range of $(0.17\char21{}0.65){m}_{0}$. These values are reasonably consistent with the values of ${m}_{\mathit{QO}}^{*}$ and ${m}_{\mathit{BC}}^{*}$. This fact shows that both ${m}_{\mathit{CR}}^{*}$ and ${m}_{\mathit{QO}}^{*}$ mainly depend on the band structure if the interaction between conduction electrons and $f$ electrons is negligible. On the other hand, in the case of a strongly correlated $f$-electron system CeSb, ${m}_{\mathit{CR}}^{*}$ is in the range of $(0.26\char21{}1.5){m}_{0}$. These values are much larger than those of ${m}_{\mathit{BC}}^{*}$. This finding shows that ${m}_{\mathit{CR}}^{*}$, as well as ${m}_{\mathit{QO}}^{*}$, is considerably enhanced in CeSb. Our results indicate that the interband interaction is important for the mass enhancement of ${m}_{\mathit{CR}}^{*}$ in CeSb.
压力下 CeIn_3 中的德哈斯-范阿尔芬效应。
DOI：
--
发表时间：
2005
期刊：
Physica B 359-361
影响因子：
--
作者：
H.Shishido et al.;R.Settai et al.;H.Shishido;R.Settai et al.;R.Settai et al.
通讯作者：
R.Settai et al.
使用磁光技术对准一维金属进行费米表面研究
DOI：
--
发表时间：
2003
期刊：
Phys.Rev. B68(5)
影响因子：
--
作者：
H.Nishikawa;S.Kojima;T.Kodama;I.Ikemoto;S.Suzuki;K.Kikuchi;M.Fujitsuka;L.Luo;A.Hongxia;Y.Araki;O.Ito;H.Imai;E.S.Choi;J.Yamada;H.Nishikawa;J.Yamada;J.Yamada;H.Imai;K.Kikuchi;H.Nishikawa;K.Inoue;Y.Oshima
通讯作者：
Y.Oshima
CeSb 铁磁相和亚铁磁 AFF1 相费米表面结构的理论计算
DOI：
--
发表时间：
2000
期刊：
Journal of Physical Society of Japan 69
影响因子：
--
作者：
Y.Kaneta;S.Iwata;et al.
通讯作者：
et al.