Change of the electronic states in CeIn3, CeRhIn5 and CePt3 Si tuned by pressure
| Autor: | K. Betsuyaku, Yoshichika Ōnuki, Y. Yasuda, Rikio Settai, Hiroaki Shishido, Tetsuo Kubo, Hisatomo Harima |
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| Rok vydání: | 2006 |
| Předmět: |
Condensed matter physics
Chemistry Mechanical Engineering Metals and Alloys Fermi surface De Haas–van Alphen effect Paramagnetism Tetragonal crystal system Mechanics of Materials Condensed Matter::Superconductivity Materials Chemistry Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Pseudogap Fermi gas Néel temperature |
| Zdroj: | Journal of Alloys and Compounds. :27-32 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2005.04.101 |
| Popis: | We have studied a change of the electronic states in antiferromagnets CeIn 3 , CeRhIn 5 and CePt 3 Si via the de Haas–van Alphen experiments. The critical pressure P c , where the Neel temperature becomes zero, is P c ≃ 2.5 GPa in CeIn 3 with the cubic crystal structure, in which the narrow pressure region superconductivity appears below a superconducting transition temperature T sc = 0.2 K. In the pressure region P > P c , we detected a main Fermi surface with the cyclotron mass m c ∗ = 53 m 0 , which most likely corresponds to a nearly spherical Fermi surface in the paramagnetic state, namely a 4f-itinerant Fermi surface. The Fermi surface in the antiferromagnet CeRhIn 5 with the tetragonal crystal structure is similar to that of LaRhIn 5 , consisting of two kinds of nearly cylindrical Fermi surfaces. We observed a drastic change of the Fermi surface from 4f-localized (LaRhIn 5 ) to 4f-itinerant (CeCoIn 5 ) Fermi surfaces at P c ≃ 2.4 GPa. The cyclotron mass increases intensively above 1.6 GPa where superconductivity sets in. CePt 3 Si with the tetragonal crystal structure without inversion symmetry is highly different from CeIn 3 and CeRhIn 5 in magnetism and superconductivity. It orders antiferromagnetically below T N = 2.3 K and becomes superconductive below T sc = 0.6 K at ambient pressure. With increasing pressure, the cyclotron mass is found to be reduced, together with a steep decrease of T N and T sc , where P c is most likely about 1.5 GPa in CePt 3 Si. The heavy fermion state of CePt 3 Si is realized at ambient pressure. |
| Databáze: | OpenAIRE |
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