TY - JOUR
T1 - Observation of a new ordered phase in the kondo semiconductor CeOs4Sb12
AU - Tayama, Takashi
AU - Ohmachi, Waki
AU - Wansawa, Mitsunobu
AU - Yutani, Daishirou
AU - Sakakibara, Toshiro
AU - Sugawara, Hitoshi
AU - Sato, Hideyuki
N1 - Publisher Copyright:
© 2015 The Physical Society of Japan.
PY - 2015/10/15
Y1 - 2015/10/15
N2 - We report the results of high-resolution dilatometry and dc magnetization measurements of a small single crystal of CeOs4Sb12, which exhibits an anomalous ordered state. Both linear thermal expansion coefficient and magnetization results reveal the presence of a new phase (phase A) transition at TA = 0.87 K, slightly below the antiferromagnetic (AFM) transition temperature TN = 1.05 K. In addition, the magnetostriction and magnetization results provide unambiguous thermodynamic evidence of the presence of a field-induced phase transition to a high-field ordered phase (phase B), as previously suggested by neutron scattering experiments. The resulting magnetic field-temperature (H-T) phase diagram of CeOs4Sb12 consists of three ordered phases: A, B, and AFM phases. From a thermodynamic point of view, it is likely that the AFM and high-field ordered states coexist within the A phase, and that the B phase is of nonmagnetic origin.
AB - We report the results of high-resolution dilatometry and dc magnetization measurements of a small single crystal of CeOs4Sb12, which exhibits an anomalous ordered state. Both linear thermal expansion coefficient and magnetization results reveal the presence of a new phase (phase A) transition at TA = 0.87 K, slightly below the antiferromagnetic (AFM) transition temperature TN = 1.05 K. In addition, the magnetostriction and magnetization results provide unambiguous thermodynamic evidence of the presence of a field-induced phase transition to a high-field ordered phase (phase B), as previously suggested by neutron scattering experiments. The resulting magnetic field-temperature (H-T) phase diagram of CeOs4Sb12 consists of three ordered phases: A, B, and AFM phases. From a thermodynamic point of view, it is likely that the AFM and high-field ordered states coexist within the A phase, and that the B phase is of nonmagnetic origin.
UR - http://www.scopus.com/inward/record.url?scp=84942057688&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.84.104701
DO - 10.7566/JPSJ.84.104701
M3 - 学術論文
AN - SCOPUS:84942057688
SN - 0031-9015
VL - 84
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 10
M1 - 104701
ER -