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J. Phys. Soc. Jpn. 75S (2006) pp. 58-61  |Previous Article| |Next Article|  |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –

Heterogeneous Metallic State in URu2Si2

Hiroshi Amitsuka1, Makoto Yokoyama2, Kei Matsuda1, Kenichi Tenya1 and Hideki Yoshizawa3

1Graduate School of Science, Hokkaido University, Sapporo 060-0810
2Faculty of Science, Ibaraki University, Mito 310-8512
3Neutron Science Laboratory, Institute of Solid State Physics, The University of Tokyo, Tokai, Ibaraki 319-1106

A review of recent attempts to understand the pressure-temperature phase diagram of URu2Si2 is given. At ambient (and weak) pressures, the low-T properties of this system are dominated by an unidentified ordered state (hidden order: HO) and non-trivial superconductivity, while by applying hydrostatic (or uniaxial or chemical) pressures, a change to a regime dominated by antiferromagnetic order (AF) is observed. In between these two regimes, an unusual heterogeneous metallic state is found. This change in regime is clearly demonstrated by neutron scattering, NMR and µSR measurements. The experimental results and strain analyses show that the low-T state of this system is extremely sensitive to the shape effects, and a slight increase in the axial strain [δ(c/a)]/(c/a) (≡\hatη) can easily change the ground state from HO to AF. The critical value is estimated to be very small (\hatηc∼10-3), suggesting that a strain distribution in a crystal is responsible for the observed heterogeneity. We will demonstrate this by showing our recent neutron-scattering experimental data using a high-quality single crystal.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/58/
DOI: 10.1143/JPSJS.75S.58


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