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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2013     Display Documents



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ID: 671340.0, MPI für Chemische Physik fester Stoffe / publications 2013
Temperature-pressure phase diagram of CeCoSi: Pressure-induced high-temperature phase
Authors:Lengyel, E.; Nicklas, M.; Caroca-Canales, N.; Geibel, C.
Language:English
Date of Publication (YYYY-MM-DD):2013-10-30
Title of Journal:Physical Review B
Volume:88
Issue / Number:15
Start Page:155137-1
End Page:155137-6
Sequence Number of Article:155137
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Ina Werner
Affiliations:MPI für chemische Physik fester Stoffe
Identifiers:ISI:000326273000002 [ID No:1]
ISSN:1098-0121 [ID No:2]
DOI:10.1103/PhysRevB.88.155137
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