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

MPG-Autoren
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Lengyel,  E.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nicklas,  M.
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Caroca-Canales,  N.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Lengyel, E., Nicklas, M., Caroca-Canales, N., & Geibel, C. (2013). Temperature-pressure phase diagram of CeCoSi: Pressure-induced high-temperature phase. Physical Review B, 88(15): 155137, pp. 155137-1-155137-6. doi:10.1103/PhysRevB.88.155137.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0015-1E2E-9
Zusammenfassung
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 (approximate to 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 approximate to 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.