Pressure evolution of the metamagnetic transition in UCoAl As measured using Co NMR

Kotegawa, Hisashi*; Nohara, Hiroki*; To, Hideki*; Matsuda, Tatsuma; Yamamoto, Etsuji  ; Haga, Yoshinori   ; Fisk, Z.; Onuki, Yoshichika; Aoki, Dai*; Flouquet, J.*

NMR measurements under pressure were preformed on the quantum critical endpoint (QCEP) of the metamagnetic transition in UCoAl. Co-NMR sensitively detects the evolution of the internal field caused by applying the external field. The loss of the NMR signal on approaching the QCEP indicates the development of spin fluctuations.