Phase Inhomogeneity of the Itinerant Ferromagnet MnSi at High Pressures

Abstract

The pressure induced quantum phase transition of the weakly itinerant ferromagnet MnSi is studied using zero-field ${}^{29}Si$ NMR spectroscopy and relaxation. Below $P^{\ast }\approx 1.2GPa$, the intensity of the signal and the nuclear spin-lattice relaxation is independent of pressure, even though the amplitude of the magnetization drops by 20% from the ambient pressure amplitude. For $P>P^{\ast }$, the decreasing intensity within the experimentally detectable bandwidth signals the onset of an inhomogeneous phase that persists to the highest pressure measured, $P\ge 1.75GPa$, which is well beyond the known critical pressure $P_c=1.46GPa$. Implications for the non-Fermi Liquid behavior observed for $P>P_c$ are discussed.

arXiv comment4 pages, 4 figures

References in corpus (3)

• Superconductivity and Quantum Criticality in CeCoIn_5
• First order transitions and multicritical points in weak itinerant ferromagnets
• Theories of non-Fermi liquid behavior in heavy fermions

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