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Coexistence of antiferromagnetism with superconductivity in CePt$$_2$$In$$_7$$; Microscopic phase diagram determined by $$^{115}$$In NMR and NQR

Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Single crystals of the heavy-fermion antiferromagnet CePt$$_{2}$$In$$_{7}$$ with a N$'e$el temperature ($$T_{N}$$) of 5.2 K at ambient pressure have been investigated by zero-field $$^{115}$$In-nuclear magnetic/quadrupole resonance (NMR/NQR) measurements as a function of applied pressure. Within the antiferromagnetic state the character of Ce's $$4f$$ electron appears to change from localized to itinerant-like at $$P^astsim2.4$$ GPa, approximately the pressure where superconductivity first emerges. With increased pressure, the superconducting transition $$T_{c}$$ reaches a maximum just at or slighty before antiferromagnetic order disappears, and not at the pressure $$P_{c}sim 3.4$$ GPa where the steeply decreasing N$'e$el boundary extrapolates to zero temperature. For $$P>P_{c}$$, the spin relaxation rate drops sharply by more than two orders of magnitude at $$T_{c}$$, suggestive of a first order transition.

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Category:Physics, Multidisciplinary

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