TY - JOUR
T1 - Thermodynamic investigation of metamagnetism in pulsed high magnetic fields on heavy fermion superconductor Ute2
AU - Imajo, Shusaku
AU - Kohama, Yoshimitsu
AU - Miyake, Atsushi
AU - Dong, Chao
AU - Tokunaga, Masashi
AU - Flouquet, Jacques
AU - Kindo, Koichi
AU - Aoki, Dai
N1 - Funding Information:
This work was supported by KAKENHI (JP15H05884, JP15H05882, JP15K21732, JP16H04006, JP15H05745).
Funding Information:
Acknowledgment This work was supported by KAKENHI (JP15H05884, JP15H05882, JP15K21732, JP16H04006, JP15H05745).
Publisher Copyright:
© 2019 The Physical Society of Japan.
PY - 2019
Y1 - 2019
N2 - We investigated the thermodynamic property of the heavy fermion superconductor UTe2 in pulsed high magnetic fields. The superconducting transition in zero field was observed at Tc = 1.65 K as a sharp heat capacity jump. Magnetocaloric effect measurements in pulsed-magnetic fields obviously detected a thermodynamic anomaly accompanied by a first-order metamagnetic transition at μ0 Hm = 36.0 T when the fields are applied nearly along the hard-magnetization b-axis. From the results of heat capacity measurements in magnetic fields, we found a drastic diverging electronic heat capacity coefficient of the normal state γN with approaching Hm. Comparing with the previous works via the magnetic Clausius–Clapeyron relation, we unveil the thermodynamic details of the metamagnetic transition. The enhancement of the effective mass observed as the development of γN indicates that quantum fluctuation strongly evolves around Hm; it assists the superconductivity emerging even in extremely high fields.
AB - We investigated the thermodynamic property of the heavy fermion superconductor UTe2 in pulsed high magnetic fields. The superconducting transition in zero field was observed at Tc = 1.65 K as a sharp heat capacity jump. Magnetocaloric effect measurements in pulsed-magnetic fields obviously detected a thermodynamic anomaly accompanied by a first-order metamagnetic transition at μ0 Hm = 36.0 T when the fields are applied nearly along the hard-magnetization b-axis. From the results of heat capacity measurements in magnetic fields, we found a drastic diverging electronic heat capacity coefficient of the normal state γN with approaching Hm. Comparing with the previous works via the magnetic Clausius–Clapeyron relation, we unveil the thermodynamic details of the metamagnetic transition. The enhancement of the effective mass observed as the development of γN indicates that quantum fluctuation strongly evolves around Hm; it assists the superconductivity emerging even in extremely high fields.
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U2 - 10.7566/JPSJ.88.083705
DO - 10.7566/JPSJ.88.083705
M3 - Article
AN - SCOPUS:85071257815
SN - 0031-9015
VL - 88
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 8
M1 - 083705
ER -