Similarity of Fermi Surface in the Hidden Order State and in the Antiferromagnetic State of URu2Si2

Details Similarity of Fermi Surface in the Hidden Order State and in the Antiferromagnetic State of URu2Si2 Similarity of Fermi Surface in the Hidden Order State and in the Antiferromagnetic State of URu2Si2

2010-10-06

arxiv.org/abs/1010.1288v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

Shubnikov-de Haas measurements of high quality URu2Si2 single crystals reveal two previously unobserved Fermi surface branches in the so-called hidden order phase. Therefore about 55% of the enhanced mass is now detected. Under pressure in the antiferromagnetic state, the Shubnikov-de Haas frequencies for magnetic fields applied along the crystalline c axis show little change compared with the zero pressure data. This implies a similar Fermi surface in both the hidden order and antiferromagnetic states, which strongly suggests that the lattice doubling in the antiferromagnetic phase due to the ordering vector QAF = (0 0 1) already occurs in the hidden order. These measurements provide a good test for existing or future theories of the hidden order parameter.

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