Science - USA (2022-04-22)

SCIENCEscience.org 22 APRIL 2022¥VOL 376 ISSUE 6591 399

A

B C

Fig. 3. NMR spectrum change and phase diagram of Sr 2 RuO 4 .(A) (Top) SC
shielding signal measured with the frequency around 7.4 MHz. (Middle) Square
root of the second moment

ffiffiffiffiffi

s^2

p
of the NMR peaks corresponding to the
spectral width at the O(2) site.ffiffiffiffiffi T* is defined as the temperature below which
s^2

p
exceeds the ordinary vortex-lattice contribution shown as the dashed
curve in (B). (Bottom) Change in the NMR Knight shift from the normal-state
value. Dashed lines in the middle and bottom are guides to the eye. The

background colors are white for the normal state, orange for the anomalous

SC state, and blue for the homogeneous SC state. (B) Magnetic-field

dependence of

ffiffiffiffiffi

s^2

p

at 70 mK. The dashed line is the extrapolation from

low-Hbehavior assuming vortex-lattice contribution ( 27 ). (C) Phase diagram

representing the FFLO region determined from the NMR results. The

red dashed curve indicates the FOT determined from the magnetocaloric

effect ( 26 ).

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