TY - JOUR
T1 - Ultralow temperature NMR of CeCoIn5
AU - Yamashita, M.
AU - Tashiro, M.
AU - Saiki, K.
AU - Yamada, S.
AU - Akazawa, M.
AU - Shimozawa, M.
AU - Taniguchi, T.
AU - Takeda, H.
AU - Takigawa, M.
AU - Shishido, H.
N1 - Funding Information:
This work was performed under the Visiting Researcher's Program of the Institute for Solid State Physics, University of Tokyo, and was supported by the Toray Science Foundation, and KAKENHI (Grants-in-Aid for Scientific Research) Grants No. 17H02918, No. 19H01848, No. 19K21842, No. 19K23417, and No. 20K03829.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/10/29
Y1 - 2020/10/29
N2 - We have performed Co59 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/T1T is observed at 20 mK, implying an appearance of magnetic order as suggested by the recent quantum oscillation measurements [H. Shishido, Phys. Rev. Lett. 120, 177201 (2018)10.1103/PhysRevLett.120.177201]. 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.
AB - We have performed Co59 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/T1T is observed at 20 mK, implying an appearance of magnetic order as suggested by the recent quantum oscillation measurements [H. Shishido, Phys. Rev. Lett. 120, 177201 (2018)10.1103/PhysRevLett.120.177201]. 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.
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U2 - 10.1103/PhysRevB.102.165154
DO - 10.1103/PhysRevB.102.165154
M3 - Article
AN - SCOPUS:85095612705
VL - 102
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 16
M1 - 165154
ER -