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Journal Articles

Neutron scattering study of antiferromagnet U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$

Ota, Kyugo*; Matsumoto, Yuji*; Watabe, Yuki*; Kaneko, Koji; Tabata, Chihiro; Haga, Yoshinori

New Physics; Sae Mulli, 73(12), p.1170 - 1173, 2023/12

https://doi.org/10.3938/NPSM.73.1170

We have performed the neutron scattering study of antiferromagnet U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$ with the honeycomb lattice to determine the magnetic structure. U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$ exhibits two phase transitions at $$T_{rm m1}$$ = 9 K and $$T_{rm m2}$$ = 26 K. In phase I at $$T_{rm m1}$$ $$<$$ $$T$$ $$<$$ $$T_{rm m2}$$, the magnetic reflections described by a propagation vector $$kappa$$$$_{rm I}$$ = (1/3, 0, 0) were observed. In phase II at $$T$$ $$<$$ $$T_{rm m1}$$, magnetic reflections of $$kappa$$$$_{rm I}$$ = (1/3, 0, 0) and $$kappa$$$$_{rm II}$$ = (1/2, 0, 0) were observed and the magnetic reflection intensity of $$kappa$$$$_{rm I}$$ = (1/3, 0, 0) is weak but finite. The hysteresis in the temperature dependent intensities is observed across the phase transition at $$T_{rm m1}$$, suggesting that the transition at $$T_{rm m1}$$ is of first order.

Oral presentation

Single crystal growth and precise phase diagram of superconducting UTe$$_2$$

Sakai, Hironori; Tokiwa, Yoshifumi; Opletal, P.; Kimata, Motoi*; Awaji, Satoshi*; Sasaki, Takahiko*; Aoki, Dai*; Kambe, Shinsaku; Tokunaga, Yo; Haga, Yoshinori

no journal, , 

We have recently developed and optimized a molten salt flux method for growing high-purity single crystals of the superconductor UTe$$_2$$. The obtained crystals show a remarkably large residual resistivity ratio to the room temperature value and a small residual electronic contribution in specific heat well below $$T_{rm c}$$. Using the high-quality single crystal of UTe$$_2$$, we have explored the superconducting phase diagram under magnetic fields along the hard magnetic $$b$$-axis. Simultaneous electrical resistivity and AC magnetic susceptibility measurements discern low- and high-field SC (LFSC and HFSC, respectively) phases with contrasting field-angular dependence. Crystal quality increases the upper critical field of the LFSC phase, but the characteristic field of $$sim$$15 T, at which the HFSC phase appears, is always the same through the various crystals. A phase boundary signature is also observed inside the LFSC phase near the characteristic field of 15 T, indicating an intermediate SC phase characterized by small flux pinning forces.

Oral presentation

Electronic structure of actinide intermetallic compound ThRh$$_6$$Ge$$_4$$; de Haas-van Alphen study

Haga, Yoshinori; Yamamoto, Etsuji; Nakamura, Ai*; Honda, Fuminori*; Aoki, Dai*; Matsumoto, Yuji*; Yamamura, Tomoo*; Shirasaki, Kenji*; Yamagami, Hiroshi*

no journal, , 

Oral presentation

Investigation of the multiorbital Kondo effect in a 5f-electron compound (Lu,U)Ru$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Tokunaga, Yo; Haga, Yoshinori; Opletal, P.; Sakai, Hironori; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Ikeda, Yoichi*; Fujita, Masaki*

no journal, , 

Oral presentation

A New form of magnetic correlation in Co-doped YbRh$$_2$$Si$$_2$$

Kaneko, Koji; Stockert, O.*; Tabata, Chihiro; Kuwahara, Keitaro*; Kiyanagi, Ryoji; Nakao, Akiko*; Krellner, C.*; Geibel, C.*

no journal, , 

Oral presentation

Metamagnetism-induced first-order transition within the superconducting state of UTe$$_2$$ under magnetic field along the easy a-axis

Tokiwa, Yoshifumi; Opletal, P.; Sakai, Hironori; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo; Haga, Yoshinori; Kimata, Motoi*; Awaji, Satoshi*; Sasaki, Takahiko*; et al.

no journal, , 

We study the interplay between superconductivity and metamagnetism of Ute$$_{2}$$ under magnetic field along the easy a-axis by analyzing the entropy, obtained from measurements of magnetization and magnetocaloric effect. Due to the weak metamagnetism around 8T the entropy in the normal-conducting state at high temperautres above the superconducting transition temperature, Tc, exhibits an anomalous enhancement as a function of the field at the metamagnetism. Suprisingly the anomaly persists even inside the superconducting state and transforms into a sharp anomaly. The anomaly is a step-wise increase of entropy with increasing magnetic field, corresponding to a heat absorbtion. Thus, we found an unprecedented phenomenon of a metamagnetism inducing a first-order phase transition within a superconducting state. We discuss that a transition within the same symmetry of $$A_u^{2h}$$ with a step-wise increase of $$B_{3u}$$ weight would be consistent with our observations.

Oral presentation

Chiral and polar quadrupole orders in URhSn

Ishitobi, Takayuki; Hattori, Kazumasa*

no journal, , 

Oral presentation

Physical properties of semimetallic magnets UOX (X = S, Se, Te)

Opletal, P.; Sakai, Hironori; Haga, Yoshinori; Miyake, Atsushi*; Tokunaga, Masashi*; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo

no journal, , 

Oral presentation

Resonant X-ray scattering study of the nonmagnetic order of 5f electrons in a pseudo-Kagome layered system URhSn

Tabata, Chihiro; Kon, Fusako*; Amitsuka, Hiroshi*; Shimizu, Yusei*; Aoki, Dai*; Nakao, Hironori*

no journal, , 

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