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Measurements of nematic susceptibility with phase sensitive nuclear magnetic resonance in pulsed strain fields

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arxiv 2312.00754 v1 pith:V4CD2XRP submitted 2023-12-01 cond-mat.supr-con cond-mat.str-el

C. Chaffey , C. Williams , M. A. Tanatar , S. L. Bud'ko , P. C. Canfield , N. J. Curro This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords strainapproachnucleartimefieldsinhomogeneousmagneticnematic
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abstract

We present nuclear magnetic resonance data in BaFe$_2$As$_2$ in the presence of pulsed strain fields that are interleaved in time with the radiofrequency excitation pulses. In this approach, the precessing nuclear magnetization acquires a phase shift that is proportional to the strain and pulse time. The sensitivity in this approach is limited by the homogeneous decoherence time, $T_2$, rather than the inhomogeneous linewidth. We measure the nematic susceptibility as a function of temperature, and demonstrate three orders of magnitude improvement in sensitivity. This approach will enable studies of the strain response in a broad range of materials that previously were inaccessible due to inhomogeneous broadening.

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