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We report Cu nuclear-quadrupole-resonance results under pressure on ahomogeneous CeCu2Si2 (Tc = 0.65 K) that revealed critical magnetic fluctuationsat the border to an antiferromagnetic phase. This exotic superconducting phaseevolves into the typical heavy-fermion superconducting phase at minutepressures exceeding Pc ~ 0.2 GPa. The nuclear spin-lattice relaxation data in apressure range 0.85 - 2.58 GPa are shown to be accountable by the SCR theorybased on the nearly antiferromagnetic Fermi-liquid model. In 0 < P < Pc ~ 0.2GPa, by contrast, we conclude that the exotic superconducting phase manifestsitself under the unconventional normal state where antiferromagnetic wavespropagate over a long range without any trace of antiferromagnetic order andthereby the heavy-fermion state breaks up.Comment: 5 pages with 4 figures embedded in the text. To be published in Phys.  Rev.

physical review. b, condensed matter

Exotic superconducting phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>close to antiferromagnetism: A Cu-NQR study under hydrostatic pressure

Exotic superconducting phase inCeCu2Si2close to antiferromagnetism: A Cu-NQR study under hydrostatic pressure