Abstract
We have implemented AC calorimetric measurements in diamond anvil pressure cells. The range of pressure (0–20 GPa), the excellent hydrostatic conditions of solid 4He used as the pressure transmitting medium associated with the possibility of continuously tuning the pressure at low temperature makes this experiment ideally suited for investigating phase diagrams under pressure and in particular for studying the thermodynamics of correlated metals around a Quantum Critical Point (QCP) where magnetic order is suppressed at absolute zero temperature. We present here results on the heavy fermion compound CeRu2Ge2 up to 8 GPa and down to 2 K. The specific heat anomalies associated with the different magnetic phase transitions are clearly resolved, allowing a precise determination of the magnetic phase diagram. On approaching the QCP close to 7 GPa, we observe a striking broadening of the antiferromagnetic transition associated with an anomalous behavior of the signal phase which could correspond to a change in the nature of this transition.
Similar content being viewed by others
REFERENCES
J. C. Ho, N. E. Phillips, and T. F. Smith, Phys. Rev. Lett. 17, 694 (1966).
D. B. McWhan, J. P. Remeika, S. D. Bader, B. B. Triplett, and N. E. Phillips, Phys. Rev. B 7, 3079 (1973).
A. Eichler and W. Gey, Rev. Sci. Instrum. 50, 1445 (1979).
E. S. Itskevich, V. F. Kraidenov, and V. S. Syzranov, Cryogenics 18, 281 (1978).
A. Eichler, H. Bohn, and W. Gey, Z. Phys. B 38, 21 (1980).
F. Bouquet, Y. Wang, H. Wilhelm, D. Jaccard, and A. Junod, Solid State Commun. 113, 367 (2000).
J. Thomasson, Y. Dumont, J.-C. Griveau, and C. Ayache, Rev. Sci. Instrum. 68, 1514 (1997).
J. Thomasson, Y. Okayama, I. Sheikin, J.-P. Brison, and D. Braithwaite, Solid State Commun. 106, 637 (1998).
J. Thomasson et al., Frontiers of High-Pressure Research, H. D. Hochheimer and R. D. Etters (eds.), Plenum Press, New York (1991), pp. 423-432.
B. Salce, J. Thomasson, A. Demuer, J.-J. Blanchard, J.-M. Martinod, L. Devoille, and A. Guillaume, to be published in Rev. Sci. Instrum.
A. Jayaraman, Rev. Sci. Instrum. 57, 1013 (1986).
Elsa Feher and M. D. Sturge, Phys. Rev. 172, 244 (1968).
J. H. Burnett, H. M. Cheong, and W. Paul, Rev. Sci. Instrum. 61(12), 3904 (1990).
J. Thomasson et al., to be published.
P. F. Sullivan and G. Seidel, Phys. Rev. 173, 679 (1968).
H. Armbrster and W. P. Kiek, Physica B 107, 385 (1981).
E. S. Itskevich and V. F. Kraidenov, Instrum. Exp. Techn. 21, 1640 (1979).
C. K. Chlang et al., Rev. Sci. Instrum. 45 (1974).
J. D. Baloga and C. W. Garland, Rev. Sci. Instrum. 48, 105 (1977).
R. Berman (1969, 1970), in Thermal Conductivity of Solids at Room Temperature and Below, Childs, Ericks, and Powell (eds.), NBS Monogr. 131 (1973).
J. S. Dugdale and J. P. Franck, Phil. Trans. R. Soc. 257, 1 (1964).
S. Raymond, P. Haen, R. Calemczuk, S. Kambe, B. Fåk, P. Lejay, T. Fukuhara, and J. Flouquet, Cond. Mat. 29, 5547 (1999).
H. Wilhelm, K. Alami-Yadri, B. Revaz, and D. Jaccard, Phys. Rev. B 59, 3651 (1999).
B. D. Rainford et al., ILL, Exp. Report N 4-03-898, Grenoble (1999) AFM.
G. S. Innacchione and D. Finotello, Phys. Rev. E 50, 13 (1994).
F. Bouquet, C. Marcenat, R. Calemczuk, A. Erb, A. Junod, M. Roulin, U. Welp, W. K. Kwok, G. W. Crabtree, N. E. Phillips, R. A. Fisher, and A. Schilling, in Proceedings of the ASI Series E356, Physics and Materials Science of Vortex States, 743 (1998), Kluwer Academic Publishers.
F. Bouquet, Ph.D. thesis, University of Grenoble 1, 1998.
B. Bogenberger and H. v. Löhneysen, Phys. Rev. Lett. 74, 1016 (1995).
R. A. Fisher, C. Marcenat, N. E. Phillips, P. Haen, F. Lapierre, P. Lejay, and J. Flouquet, J. Low Temp. Phys. 84, 49 (1991).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Demuer, A., Marcenat, C., Thomasson, J. et al. Calorimetric Study of CeRu2Ge2 Under Continuously Swept Hydrostatic Pressure up to 8 GPa. Journal of Low Temperature Physics 120, 245–257 (2000). https://doi.org/10.1023/A:1004685711942
Issue Date:
DOI: https://doi.org/10.1023/A:1004685711942