Thermal properties of heavy-fermion CeRu2Si2.
Thermal properties of heavy-fermion CeRu2Si2.
复制标题
重费米子 CeRu2Si2 的热性质。
DOI：
10.1103/physrevb.40.8759
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Flouquet
中科院分区：
文献类型：
--
作者：
Lacerda;de Visser A;Haen;Lejay;Flouquet
We present measurements of the coefficients of linear thermal expansion of single-crystalline samples of the tetragonal heavy-fermion compound ${\mathrm{CeRu}}_{2}$${\mathrm{Si}}_{2}$, and its nonmagnetic analog ${\mathrm{LaRu}}_{2}$${\mathrm{Si}}_{2}$, in the temperature range 1.5\char21{}270 K. The electronic part of the thermal expansion of ${\mathrm{CeRu}}_{2}$${\mathrm{Si}}_{2}$ yields two distinct anomalies: (1) a huge positive contribution, caused by the (antiferro)magnetic interactions between the quasiparticles, centered at 9 K, and (2) a negative crystal-field contribution centered at 120 K. The data are compared with existing specific-heat data (Tl100 K). An analysis in terms of Gr\"uneisen parameters yields the very large value of ${\ensuremath{\Gamma}}_{\mathrm{hf}=190}$ for the low-temperature contribution and a value ${\ensuremath{\Gamma}}_{\mathrm{cf}=\mathrm{\ensuremath{-}}5.3}$ for the crystal-field contribution. A quantitative analysis using a simple single resonance-level model yields a Kondo-type temperature of 19 K. An analysis of the crystal-field contribution yields a first excited level at 288 K. We also discuss low-temperature scaling behavior by comparing new magnetostriction measurements, that cover the metamagnetic behavior, with magnetization data.
We present measurements of the coefficients of linear thermal expansion of single-crystalline samples of the tetragonal heavy-fermion compound ${\mathrm{CeRu}}_{2}$${\mathrm{Si}}_{2}$, and its nonmagnetic analog ${\mathrm{LaRu}}_{2}$${\mathrm{Si}}_{2}$, in the temperature range 1.5\char21{}270 K. The electronic part of the thermal expansion of ${\mathrm{CeRu}}_{2}$${\mathrm{Si}}_{2}$ yields two distinct anomalies: (1) a huge positive contribution, caused by the (antiferro)magnetic interactions between the quasiparticles, centered at 9 K, and (2) a negative crystal-field contribution centered at 120 K. The data are compared with existing specific-heat data (Tl100 K). An analysis in terms of Gr\"uneisen parameters yields the very large value of ${\ensuremath{\Gamma}}_{\mathrm{hf}=190}$ for the low-temperature contribution and a value ${\ensuremath{\Gamma}}_{\mathrm{cf}=\mathrm{\ensuremath{-}}5.3}$ for the crystal-field contribution. A quantitative analysis using a simple single resonance-level model yields a Kondo-type temperature of 19 K. An analysis of the crystal-field contribution yields a first excited level at 288 K. We also discuss low-temperature scaling behavior by comparing new magnetostriction measurements, that cover the metamagnetic behavior, with magnetization data.