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1.For a recent review, see, N Bykovetz, J Klein, CL Lin, and K Raj, JAP 109, 07E165 (2011).
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4.These measurements were made on Quantum Design MPMS SQUIDs at LSU (RSO option) and at Temple University (DC SQUID).Similar results were obtained at ISIS, where SQUID measurements were also made at 2.5, 5 and 10 kbar.
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13.We remark that the constancy of Tcover the pressure range of 0 ≲ p ≲ 5 kbar (see Fig 1(a)), substantiated by our ISIS SQUID measurements,4and by NMR measurements9 is very mysterious. The pressure changes should result in changes in the exchange constants, and in the dipolar and hyperfine fields, but do not appear to do so in EuSe over this range of pressure.

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EuSe is a simple magnetic system that appears to show many complicated features. Under applied pressure it undergoes a transition from an antiferromagnet (AF) to a ferromagnet(FM). This transition provides a means of testing certain basic fundamentals of magnetic theory and an opportunity to explore the complexities of EuSe. Using the muon-spin rotation and relaxation technique (SR), EuSe was measured at pressures ranging from ambient to 11 kbar. In ambient-pressure EuSe, muon data reveal two local fields, but show only a single field in the FM state formed under pressure. The SR measurements appear to show a continuous transition at Tc, contrary to previous Mössbauer results that were interpreted as being evidence of a first-order transition. Values determined for the critical exponent, , in AF and FM EuSe, differ and therefore appear to be a clear counterexample to the Universality Hypothesis. The values of also are indicative of EuSe’s being a 2D magnet for pressures up to 11 kbar. The nature and values of the local fields seen by the muons is discussed and analyzed.


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