A Novel Ordered Phase in SrCu2(BO3)2 under High Pressure

We report results of 11B NMR and susceptibility measurements on the quasi 2D frustrated dimer spin system SrCu2(BO3)2 under high pressure. At 2.4 GPa and in a magnetic field of 7 T, NMR lines split with decreasing temperature in two steps. A gradual splitting below T=30 K breaking the four-fold symmetry of magnetic response is followed by a further sudden splitting below 3.6 K. The latter indicates a magnetic phase transition, which is also marked by a kink in the susceptibility at 1.44 GPa. From the magnetic hyperfine shift data, we conclude that the low-T phase has a doubled unit cell containing two types of dimers, one in a nearly singlet state and the other with a finite magnetization down to T=0.Comment: 5 pages, 4 figures, to appear in J. Phys. Soc. Jpn. (July 2007

The ECHR and non-discrimination

The Strasbourg-based Court and Commission of Human Rights have both attached great importance to the prohibition of discrimination. In this article, Yutaka Arai examines their approach, which leaves national authorities with only the narrowest margin of appreciation on the issue. Article by Yutaka Arai (Research student, University of Cambridge) published in Amicus Curiae - Journal of the Institute of Advanced Legal Studies and its Society for Advanced Legal Studies. The Journal is produced by the Society for Advanced Legal Studies at the Institute of Advanced Legal Studies, University of London

Proportionality – a German approach

This article briefly discusses the nature and character of the principles of proportionality in relation to administrative discretion in German public law. The author argues that its rigorous application is premised on Germany’s special historical context and its post-war determination to strengthen the protection of fundamental rights. Article by Dr Yutaka ARAI-Takahashi published in Amicus Curiae - Journal of the Institute of Advanced Legal Studies and its Society for Advanced Legal Studies. The Journal is produced by the Society for Advanced Legal Studies at the Institute of Advanced Legal Studies, University of London