Ultralow temperature NMR of CeCoIn5

We have performed 59Co NMR measurements of CeCoIn5 down to ultralow temperatures. We find that the temperature dependence of the spin-echo intensity provides a good measure of the sample temperature, enabling us to determine a pulse condition not heating up the sample by the NMR pulses down to ultra...

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Bibliographic Details
Published in:Physical review. B 2020-10, Vol.102 (16), p.1
Main Authors: Yamashita, M, Tashiro, M, Saiki, K, Yamada, S, Akazawa, M, Shimozawa, M, Taniguchi, T, Takeda, H, Takigawa, M, Shishido, H
Format: Article
Language:English
Subjects:
Antiferromagnetism
NMR
Nuclear magnetic resonance
Relaxation time
Temperature
Temperature dependence
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Summary:We have performed 59Co NMR measurements of CeCoIn5 down to ultralow temperatures. We find that the temperature dependence of the spin-echo intensity provides a good measure of the sample temperature, enabling us to determine a pulse condition not heating up the sample by the NMR pulses down to ultralow temperatures. From the longitudinal relaxation time ( T1 ) measurements at 5 T applied along the c axis, a pronounced peak in 1/T1 T is observed at 20 mK, implying an appearance of magnetic order as suggested by the recent quantum oscillation measurements [H. Shishido et al., Phys. Rev. Lett. 120, 177201 (2018)]. On the other hand, the NMR spectrum shows no change below 20 mK. Moreover, the peak in 1/T1T disappears at 6 and 8 T in contrast to the results of the quantum oscillation. We discuss that an antiferromagnetic state with a moment lying in the a − b plane can be a possible origin for the peak in 1/T1T at 5 T.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.165154