Temperature-pressure phase diagram of CeCoSi: Pressure-induced high-temperature phase

E. Lengyel; M. Nicklas; N. Caroca-Canales; C. Geibel

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Temperature-pressure phase diagram of CeCoSi: Pressure-induced high-temperature phase

机译：CeCoSi的温度-压力相图：压力诱导的高温相

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We have studied the temperature-pressure phase diagram of CeCoSi by electrical-resistivity experiments under pressure. Our measurements revealed a very unusual phase diagram. While at low pressures no dramatic changes and only a slight shift of the Neel temperature T_N (≈10 K) are observed, at about 1.45 GPa a sharp and large anomaly, indicative of the opening of a spin-density wave gap, appears at a comparatively high temperature T_s ≈ 38 K. With further increasing pressure, T_s shifts rapidly to low temperatures and disappears at about 2.15 GPa, likely continuously in a quantum critical point, but without evidence for superconductivity. Even more surprisingly, we observed a clear shift of T_s to higher temperatures upon applying a magnetic field. We discuss two possible origins for T_s: magnetic ordering of Co and a metaorbital type of transition of Ce.

机译：我们通过在压力下的电阻率实验研究了CeCoSi的温度-压力相图。我们的测量揭示了一个非常不寻常的相图。在低压下，没有观察到剧烈变化，仅观察到尼尔温度T_N（≈10K）的微小变化，而在1.45 GPa处，出现了一个尖锐且大的异常现象，表明自旋密度波隙的打开。相对较高的温度T_s≈38K。随着压力的进一步升高，T_s迅速转变为低温，并在约2.15 GPa处消失，可能在量子临界点连续发生，但没有超导电性的证据。更令人惊讶的是，我们观察到在施加磁场后T_s向较高温度的明显偏移。我们讨论了T_s的两个可能的起源：Co的磁有序性和Ce的亚轨道类型的跃迁。

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《Physical review》 |2013年第15期|155137.1-155137.6|共6页
作者
E. Lengyel; M. Nicklas; N. Caroca-Canales; C. Geibel;
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作者单位

Max Planck Institute for Chemical Physics of Solids, Noethnitzer Str. 40, D-01187 Dresden, Germany;

Max Planck Institute for Chemical Physics of Solids, Noethnitzer Str. 40, D-01187 Dresden, Germany;

Max Planck Institute for Chemical Physics of Solids, Noethnitzer Str. 40, D-01187 Dresden, Germany;

Max Planck Institute for Chemical Physics of Solids, Noethnitzer Str. 40, D-01187 Dresden, Germany;

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正文语种 eng
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关键词
strongly correlated electron systems; heavy fermions; pressure effects; spindensity waves;

机译：强相关电子系统;重费米子压力影响;自旋密度波;

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Temperature-pressure phase diagram of CeCoSi: Pressure-induced high-temperature phase

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