Possible field-induced quantum criticality in Ce3Pd20Si6
Possible field-induced quantum criticality in Ce3Pd20Si6
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Ce3Pd20Si6 中可能存在场致量子临界
DOI：
10.1088/1742-6596/51/1/054
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Paschen
中科院分区：
文献类型：
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作者：
A. Strydom;A. Pikul;F. Steglich;S. Paschen
Ce 3 Pd 20 Si 6以立方晶体结构形成，其中铈原子位于两个不同的位置上，这两个位置都具有立方点对称性，导致两个交错的立方铈亚晶格。我们在这里提出的详细的低温比热和电阻率测量的结果，在磁场高达14 T，在复杂的低温行为，这是在以前的文献报告中提到的这种化合物的目的脱落光。我们的比热数据显示了两个相变，在TL（B = 0）= 0.31 K和在TU（B = 0）= 0.5 K，分别可能是磁起源，并与明显不同的响应施加磁场。热释光向低温方向移动，在1 T以上的磁场中变得不可分辨。另一方面，TU向上移动并且在8 T以上的场中消失。电阻率数据在有限的磁场范围内遵循Δρ π T5/3幂律行为，表明在三维铁磁量子相变附近存在自旋涨落。
Ce3Pd20Si6 forms in a cubic crystal structure with the cerium atoms located on two different sites, both of cubic point symmetry, resulting in two interleaved cubic cerium sublattices. We present here the results of detailed low-temperature specific heat and electrical resistivity measurements taken in magnetic fields up to 14 T, with the purpose of shedding light on the complex low-temperature behaviour that was alluded to in previous literature reports on this compound. Our specific heat data show two phase transitions, at TL(B = 0) = 0.31 K and at TU(B = 0) = 0.5 K respectively, probably of magnetic origin, and with distinctly different response to applied magnetic fields. TL is shifted towards lower temperatures and becomes indiscernable in fields above 1 T. TU on the other hand is shifted upward and disappears in fields above 8 T. The electrical resistivity data follow a Δρ ∝ T5/3 power-law behaviour below TU for a limited range in field, suggestive of spin fluctuations near a three-dimensional ferromagnetic quantum phase transition.