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Occurrence of two quantum critical points in Yb2Pd2Sn or, Yb systems do not behave mirror-like to Ce compounds

E. BAUER1,* , H. MICHOR1, T. MURAMATSU2, T. KANEMASA2, T. KAGAYAMA2, K. SHIMIZU2, Y. AOKI3, H. SATO3, M. GIOVANNINI4

Affiliation

  1. Institute of Solid State Physics, Wiedner Hauptstrasse 8-10,Vienna University of Technology, A-1040 Wien, Austria
  2. Kyokugen, Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531
  3. Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
  4. Dipartimento di Chimica e Chimica Industriale,University of Genova, Via Dodecaneso 31, I-16146 Genova

Abstract

We report on the discovery of two pressure driven quantum critical points appearing in ternary Yb2Pd2Sn, where the application of pressure of about 1 GPa establishes long-range antiferromagnetic order, but above an upper bound of about 4 GPa, magnetic order vanishes again, giving rise to two phase transitions at zero temperature. Associated with the QCP’s in Yb2Pd2Sn, we observe nFl behaviour from precise resistivity measurements. We argue that this emergent behaviour corresponds to two pressure dependent, mutually competing energy scales exerted to the Yb ions. Electronic properties associated with the paramagnetic state below and above the critical pressures disagree, as evident from a negative and a positive Grüneisen parameter, respectively. Our novel finding, without much doubt, is a unique property of Yb systems..

Keywords

Pressure drven critical points, Yb-Pd-Sn, Quantum phase transition.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

E. BAUER, H. MICHOR, T. MURAMATSU, T. KANEMASA, T. KAGAYAMA, K. SHIMIZU, Y. AOKI, H. SATO, M. GIOVANNINI, Occurrence of two quantum critical points in Yb2Pd2Sn or, Yb systems do not behave mirror-like to Ce compounds, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1633-1638 (2008)