We have performed precise dc magnetization measurements for a single crystal of UBe₁₃ down to 0.14 K, up to 80 kOe. We observed a magnetic anomaly in the superconducting (SC) mixed state at a field, named H_Mag^* (∼26  kOe, at 0.14 K), implying that UBe₁₃ has a magnetically unusual SC state. We expect that the origin of the H_Mag^* anomaly would be (1) unusual SC diamagnetic response, or (2) a peculiarity of the normal-state magnetization due to vortices in the SC mixed state.
For more information please see our paper: Y. Shimizu et al., Phys. Rev. Lett. 109 (2012) 217001.
本研究の背景について日本語による解説記事があります。強相関電子磁性１研究室の研究トピックス「重い電子系超伝導体UBe₁₃の超伝導混合状態における磁気特性 」 をご覧下さい。

新学術領域研究「重い電子の形成と秩序化」のニュースレターに最近の研究内容の解説文が掲載されました。PDFでご覧いただけます。（柳澤の記事はpp.25より）

新学術領域研究「重い電子の形成と秩序化」のニュースレターに最近の研究内容の解説文が掲載されました。PDFでご覧にいただけます。（柳澤の記事はpp.12より）

E-prints (Updated: Nov 29th, 2019)

▶ HUSCAP (Open Access Repository)

'Electric quadrupolar contributions in the magnetic phases of UNi₄B'
T. Yanagisawa, H. Matsumori, H. Saito, H. Hidaka, H. Amitsuka, S. Nakamura, S. Awaji, D. I. Gorbunov, S. Zherlitsyn, J. Wosnitza, K. Uhlířová, M. Vališka, and V. Sechovský
Phys. Rev. Lett. 126 (2021) 157201.

'Quadrupolar Susceptibility and Magnetic Phase Diagram of PrNi₂Cd₂₀ with Non-Kramers Doublet Ground State'
Tatsuya Yanagisawa, Hiroyuki Hidaka, Hiroshi Amitsuka, Shintaro Nakamura, Satoshi Awaji, Elizabeth L. Green, Sergei Zherlitsyn, Joachim Wosnitza, Duygu Yazici, Benjamin. D. White, and M. Brian Maple
Published in Philosophical Magazine100,1268-1281 (2020).

'Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y_1-xPr_xIr₂Zn₂₀'
T. Yanagisawa, H. Hidaka, H. Amitsuka, S. Zherlitsyn, J. Wosnitza, Y. Yamane, and T. Onimaru
Published in Phys. Rev. Lett. 123 (2019) 067201.

'Search for multipolar instability in URu₂Si₂ studied by ultrasonic measurements under pulsed magnetic field'
T. Yanagisawa, S. Mombetsu, H. Hidaka, H. Amitsuka, P. T. Cong, S. Yasin, S. Zherlitsyn, J. Wosnitza, K. Huang, N. Kanchanavatee, M. Janoschek, M. B. Maple, D. Aoki
Published in Phys. Rev. B 97 (2018) 155137.

'Study of Localized Character of 4f Electrons and Ultrasonic Dispersions in SmOs₄Sb₁₂ by High-Pressure High-Frequency Ultrasonic Measurements'
S. Mombetsu, T. Murazumi, H. Hidaka, T. Yanagisawa, H. Amitsuka, P.-C. Ho, and M. B. Maple
Published in Phys. Rev. B 94 (2016) 084152.

'Crystalline Electric Field and Kondo Effect in SmOs₄Sb₁₂'
Shota Mombetsu, Tatsuya Yanagisawa, Hiroyuki Hidaka, Hiroshi Amitsuka, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Pei-Chun Ho, and M. Brian Maple
Published in J. Phys. Soc. Jpn. 85 (2016) 043704.

'Hybridization-Driven Orthorhombic Lattice Instability in URu₂Si₂'
Tatsuya Yanagisawa, Shota Mombetsu, Hiroyuki Hidaka, Hiroshi Amitsuka, Mitsuhiro Akatsu, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Kevin Huang, Mark Janoschek, and M. Brian Maple
Published in Phys. Rev. B 88 (2013) 195150.

'Gamma 3-type Lattice Instability and the Hidden Order of URu₂Si₂'
Tatsuya Yanagisawa, Shota Mombetsu, Hiroyuki Hidaka, Hiroshi Amitsuka, Mitsuhiro Akatsu, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Kevin Huang, and M. Brian Maple
Published in J. Phys. Soc. Jpn. 82 (2013) 0130601.

'Observation of unusual magnetic anomaly in superconducting mixed state of heavy-fermion compound UBe₁₃ by precise DC magnetization measurements Studied by DC Magnetization Measurement'
Yusei Shimizu, Yoshinori Haga, Yoichi Ikeda, Tatsuya Yanagisawa, and Hiroshi Amitsuka
Published in Phys. Rev. Lett. 109 (2012) 217001.

‘Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs₄Sb₁₂'
Tatsuya Yanagisawa, Hitoshi Saito, Hiroyuki Hidaka, Hiroshi Amitsuka, Koji Araki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Pei-Chun Ho, Ryan E. Baumbach, M. Brian Maple
Published in J. Phys. Soc. Jpn. 80 (2010) 043601.

「超音波からみた多極子・ラットリング(多極子,重い電子系若手秋の学校,講義ノート)」
柳澤達也
物性研究2012 年1 月, 第97 巻, 第4 号, pp. 791-823.

▶ cond-mat (arXiv)

'Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y_1-xPr_xIr₂Zn₂₀'
T. Yanagisawa, H. Hidaka, H. Amitsuka, S. Zherlitsyn, J. Wosnitza, Y. Yamane, and T. Onimaru
[arXiv:1907.06284]

'Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs₄Sb₁₂'
K. Götze, M. J. Pearce, P. A. Goddard, M. Jaime, M. B. Maple, K. Sasmal, T. Yanagisawa, A. McCollam, T. Khouri, P.-C. Ho, and J. Singleton
[arXiv:1907.09181]

'Magnetic, Transport, and Phonon Properties of the Trivalent Eu Metallic Compound EuBe₁₃'
Hiroyuki Hidaka, Kota Mizuuchi, Tatsuya Yanagisawa, and Hiroshi Amitsuka [arXiv:1901.06120]

'Fermi-surface topologies and low-temperature phases of the filled skutterudite compounds CeOs₄Sb₁₂ and NdOs₄Sb₁₂'
Pei Chun Ho, John Singleton, Paul A. Goddard, Fedor F. Balakirev, Shalinee Chikara, Tatsuya Yanagisawa, M. Brian Maple, David B. Shrekenhamer, Xia Lee, and Avraham T. Thomas
arXiv:1611.00318 [cond-mat.str-el]

'Peculiar Magnetism of UAu₂Si₂'
Chihiro Tabata, Naoyuki Miura, Klára Uhlířová, Michal Vališka, Hiraku Saito, Hiroyuki Hidaka, Tatsuya Yanagisawa, Vladimír Sechovský, and Hiroshi Amitsuka
arXiv:1608.06035 [cond-mat.str-el]

'Study of Localized Character of 4f Electrons and Ultrasonic Dispersions in SmOs₄Sb₁₂ by High-Pressure High-Frequency Ultrasonic Measurements'
S. Mombetsu, T. Murazumi, H. Hidaka, T. Yanagisawa, H. Amitsuka, P.-C. Ho, and M. B. Maple
arXiv:1608.01066 [cond-mat.str-el] (2016) .

'Crystalline Electric Field and Kondo Effect in SmOs₂Sb₁₂'
Shota Mombetsu, Tatsuya Yanagisawa, Hiroyuki Hidaka, Hiroshi Amitsuka, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Pei-Chun Ho, and M. Brian Maple
arXiv:1603.09069 [cond-mat.str-el]

'Ultrasonic Study of the Hidden Order and Heavy-Fermion State in URu₂Si₂ with Hydrostatic Pressure, Rh-doping, and High-Magnetic Fields'
Tatsuya Yanagisawa
arXiv:1312.3084 [cond-mat.str-el] (2013).

'Hybridization-Driven Orthorhombic Lattice Instability in URu₂Si₂'
Tatsuya Yanagisawa, Shota Mombetsu, Hiroyuki Hidaka, Hiroshi Amitsuka, Mitsuhiro Akatsu, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Kevin Huang, Mark Janoschek, and M. Brian Maple
arXiv:1311.3748 [cond-mat.str-el] (2013).

'Gamma 3-type Lattice Instability and the Hidden Order of URu₂Si₂'
Tatsuya Yanagisawa, Shota Mombetsu, Hiroyuki Hidaka, Hiroshi Amitsuka, Mitsuhiro Akatsu, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Kevin Huang, and M. Brian Maple
arXiv:1211.7185v1 [cond-mat.str-el] (2012).

'A Study of Ni-Substitution Effects on Heavy-Fermion CeCu₂Si₁₃ - Similarities between Ni Substitution and High-Pressure Effects -'
Yoichi Ikeda, Shingo Araki, Tatsuo C. Kobayashi, Yusei Shimizu, Tatsuya Yanagisawa and Hiroshi Amitsuka
arXiv:1206.5747v1 [cond-mat.str-el] (2012).

'Maki Parameter and Upper Critical Field of the Heavy-Fermion Superconductor UBe₁₃'
Yusei Shimizu, Yoichi Ikeda, Takumi Wakabayashi, Kenichi Tenya, Yoshinori Haga, Hiroyuki Hidaka, Tatsuya Yanagisawa and Hiroshi Amitsuka
cond-mat/1106.2397 (2011).

‘Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically Robust Heavy Fermion System SmOs₄Sb₁₂'
Tatsuya Yanagisawa, Hitoshi Saito, Hiroyuki Hidaka, Hiroshi Amitsuka, Koji Araki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Pei-Chun Ho, Ryan E. Baumbach, M. Brian Maple
cond-mat/1010.1387 (2010)

この記事には続きがあります：続きを読む ...