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We report additional experimental evidences about the presence of anuniversal behavior in the Field-Temperature Phase Diagram of Type IISuperconductors. This behavior is characterized by a phase transition in thevortex matter between the disordered and the Bragg Glass phase. Theexperimental detection of a Peak Effect phenomenon has been proved to bestrictly connected to the existence of this phase transition. In this paper, weshow the first observation of a Peak Effect in the compound Nb3Sn, by using 1stharmonics of the AC magnetic susceptibility. Peak Effect has been detected atfields between 3T and 13T, whereas it is not observable at higher fields. Thisseems to be in contrast with the theoretical predictions of such a phasetransition at all fields. Nevertheless, by measuring the 3rd harmonics of theAC susceptibility, this phase transition has been detected up to our highestavailable field (19 T), thus demonstrating the necessity of the higherharmonics analysis in studying these topics and moreover proving the validityof the theoretical predictions.Comment: 4 pages, 5 figure

physical review. b, condensed matter and materials physics

Transition between the Bragg glass and the disordered phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Nb</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">Sn</mml:mi></mml:mrow></mml:math>detected by third harmonics of the ac magnetic susceptibility

Transition between the Bragg glass and the disordered phase inNb3Sndetected by third harmonics of the ac magnetic susceptibility