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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB12
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Effects of disorder and isotopic substitution in the specific heat and Raman scattering in LuB12

机译：LuB12中无序和同位素取代对比热和拉曼散射的影响

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摘要

Precision measurements of the specific heat and spectral intensity I(ω) of Raman scattering for Lu N B12 single crystal samples with various boron isotopes (N = 10, 11, nat) have been performed at low and intermediate temperatures. A boson peak in the low-frequency part of the I(ω) spectrum has been observed for the first time for lutetium dodecaboride at liquid nitrogen temperatures. It has been shown that low-temperature anomalies in the specific heat, along with the features of Raman spectra, can be interpreted in terms of the transition to a cageglass state at T*= 50-70 K, which appears when Lu~(3+) ions are displaced from the centrosymmetric position in cavities of a rigid covalent boron sublattice towards the randomly located boron vacancies. The concentrations of various two-level systems that correspond to two types of vibrational clusters with correlation lengths of 12-15 and 18-22 ?, respectively, have been estimated. The vibrational density of states of LuB_(12) has been calculated from Raman spectra in the model of soft atomic potentials. An approach has been proposed to explain the dielectrization of the properties of the YbB_(12) compound at T < T*, as well as the features of the formation of magnetic structures in RB_(12) antiferromagnets (R = Tb, Dy, Ho, Er, Tm) and the suppression of superconductivity in LuB_(12).
机译：在低温和中温条件下，对具有各种硼同位素（N = 10、11，nat）的Lu N B12单晶样品进行了拉曼散射的比热和光谱强度I（ω）的精确测量。在液态氮温度下，首次观察到十二硼酸在I（ω）光谱的低频部分有一个玻色子峰。已经表明，比热的低温异常以及拉曼光谱的特征可以用在T * = 50-70 K时向笼形玻璃态的转变来解释，这在Lu〜（3 +）离子从刚性共价硼亚晶格腔中的中心对称位置向随机定位的硼空位移动。已经估计了分别对应于相关长度为12-15和18-22？的两种类型的振动簇的各种二级系统的浓度。 LuB_（12）态的振动密度是根据软原子势模型中的拉曼光谱计算得出的。已经提出了一种方法来解释YbB_（12）化合物在T

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