Google Scholar: Tatsuya Yanagisawa (My citation)

: ReaD&Researcher map:0112973

Researcher ID (Thomson Scientific): AAD-8278-2019

▶ 2023

'Elemental Dilution Effect on the Elastic Response due to a Quadrupolar Kondo Effect of the Non-Kramers System Y_1-xPr_xIr₂Zn₂₀'
Ruo Hibino, Tatsuya Yanagisawa, Yoshito Mikami, Hiroyuki Hidaka, Hiroshi Amitsuka, Sergei Zherlitsyn, Joachim Wosnitza, Yu Yamane, Takahiro Onimaru
Published : 2023 6/29
J. Phys. Soc. Jpn. 92 (2023) 074708.[arXiv:2212.09714]

'Lattice Instability of UTe₂ studied by Ultrasonic Measurements'
Keita USHIDA, Tatsuya YANAGISAWA, Ruo HIBINO, Masato MATSUDA, Hiroyuki HIDAKA, Hiroshi AMITSUKA, Georg KNEBEL, Jacques FLOUQUET, Dai AOKI
JPS Conf. Proc. 38 (2023) 011021. [arXiv:2211.08354]

'Elastic Properties and Crystalline-Electric-Field Effects of UIr₂Si₂ '
Masato MATSUDA, Tatsuya YANAGISAWA, Ruo HIBINO, Fusako KON, Hiroyuki HIDAKA, and Hiroshi AMITSUKA
JPS Conf. Proc. 38 (2023) 011075.

'Crossover of the Elastic Response due to the Quadrupolar Kondo Effect on the Non-Kramers Systems Y_1-xPr_xIr₂Zn₂₀'
Ruo Hibino, Tatsuya Yanagisawa, Yoshito Mikami, Hiroyuki Hidaka, Hiroshi Amitsuka, Sergei Zherlitsyn, Joachim Wosnitza, Yu Yamane, and Takahiro Onimaru
JPS Conf. Proc. 38 (2023) 011089.

'Correlation between antiferromagnetic and charge-density-wave order in UPt ₂Si₂ studied by resonant X-Ray scattering'
Fusako Kon, Chihiro Tabata, Kodai Miura, Ruo Hibino, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hironori Nakao, and Hiroshi Amitsuka
Published: 2023/6/5
SciPost Phys. Proc. 11 (2023) 011.

▶ 2022

'Elastic response of U₃Cu₄Ge₄ to spontaneous and field-induced phase transitions'
D. I. Gorbunov, R. Hibino, Y. Skourski, T. Yanagisawa, A. V. Andreev, S. Zherlitsyn, and J. Wosnitza
Phys. Rev. B 106 (2022)144403.

'Muon spin rotation and relaxation in Pr_1-xNd_xOs₄Sb₁₂: Superconductivity and magnetism in Pr-rich alloys'
P. -C. Ho, D. E. MacLaughlin, M. B. Maple, Lei Shu, A. D. Hillier, O. O. Bernal, T. Yanagisawa, P. K. Biswas, Jian Zhang, Cheng Tan, S. D. Hishida, and T. McCullough-Hunter
Phys. Rev. B 106 (2022) 144508.

'Magnetic Field–Temperature Phase Diagram of CeCoSi Constructed on the Basis of Specific Heat, Magnetoresistivity, and Magnetization Measurements: Single Crystal Study'
Hiroyuki Hidaka, Shun Yanagiya, Eikai Hayasaka, Yuma Kaneko, Tatsuya Yanagisawa, Hiroshi Tanida, and Hiroshi Amitsuka
J. Phys. Soc. Jpn. 91 (2022) 094701.[arXiv:2203.09754]

▶ 2021

'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. [arXiv:2103.02391]

'Possible Magnetic Structure with a Tilted Helical Plane in SmBe₁₃ Probed by ¹³Be-NMR Study'
Hiroyuki Hidaka , Yoshihiko Ihara, Tatsuya Yanagisawa, and Hiroshi Amitsuka
J. Phys. Soc. Jpn. 90, 093701 (2021).[arXiv:2107.13769]

▶ 2020

'Helical magnetic ordering studied in single-crystalline GdBe₁₃'
Hiroyuki Hidaka, Kota Mizuuchi, Eikai Hayasaka, Tatsuya Yanagisawa, Jun Ohara, and Hiroshi Amitsuka
Phys. Rev. B 102 (2020) 174408.

'Logarithmic Elastic Response 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
JPS Conf. Proc. 29 (2020) 015002.[arXiv:1911.07462]

'Linearly Polarized Hard X-Ray Photoemission Spectroscopy of PrBe₁₃'
Satoru Hamamoto, Yuina Kanai-Nakata, Hidenori Fujiwara, Kentaro Kuga, Takayuki Kiss, Atsushi Higashiya, Atsushi Yamasaki, Shin Imada, Arata Tanaka, Kenji Tamasaku, Makina Yabashi, Tetsuya Ishikawa, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi Amitsuka, Akira Sekiyama
JPS Conf. Proc. 29 (2020) 012010.

'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
Phys. Rev. B 101 (2020) 075102.[arXiv:1910.01757]

'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
Philosophical Magazine100,1268-1281 (2020). [arXiv:1911.11914] [HUSCAP]

'Magnetic Phase Transitions of CeTe at 50 mK in Fields up to 28 T'
Shintaro Nakamura, Satoshi Awaji, Tatsuya Yanagisawa, Takeaki Saito, Takeshi Matsumura, and Akira Ochiai
JPS Conf. Proc. 30, 011155 (2020).

'Magnetic Phase Diagram of Helical Magnet GdBe₁₃'
Hiroyuki Hidaka, Kota Mizuuchi, Tatsuya Yanagisawa, and Hiroshi Amitsuka
JPS Conf. Proc. 30, 011117 (2020).

'Rare-Earth Atomic Motion in RBe₁₃ (R: La, Pr, Sm)'
Satoshi Tsutsui, Yusei Shimizu, Hiroyuki Hidaka, Akinari Kohriki, Ryoya Murata, Yoshitaka Yoda, Tatsuya Yanagisawa, Hiroshi Amitsuka
JPS Conf. Proc. 30, 011115 (2020).

'Observation of the 4f ground-state symmetry in strongly correlated cubic Pr compounds probed by linearly polarized 3d core-level photoemission spectroscopy'
S. Hamamoto, Y. Kanai, S. Fujioka, Y. Nakatani, H. Fujiwara, K. Kuga, T. Kiss, A. Higashiya, A. Yamasaki, S. Imada, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, H. Hidaka, T. Yanagisawa, H. Amitsuka, K.T. Matsumoto, T. Onimaru, T. Takabatake, and A. Sekiyama
Journal of Electron Spectroscopy and Related Phenomena 238 146885 (2020).

▶ 2019

'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
Phys. Rev. Lett. 123 067201 (2019).[arXiv:1907.06284]
▶ Highlights

'Muon spin rotation and relaxation in Pr_1-xNd_xOs₄Sb₁₂: superconductivity and magnetism in Pr-rich alloys'
P. C. Ho, D. E. MacLaughlin, M. B. Maple, Lei Shu, A. D. Hillier, O. O. Bernal, T. Yanagisawa, P. K. Biswas, Jian Zhang, Cheng Tan, S. D. Hishida, T. McCullough-Hunter
[arXiv:1910.01757]

'Magnetic, Transport, and Phonon Properties of the Trivalent Eu Metallic Compound EuBe₁₃'
Hiroyuki Hidaka, Kota Mizuuchi, Tatsuya Yanagisawa, and Hiroshi Amitsuka
J. Phys. Soc. Jpn. 88 88, 034708 (2019).[arXiv:1901.06120]

▶ 2018

'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
Phys. Rev. B 97 (2018) 155137. [arXiv/1804.01244]

'Evidence for a New Magnetoelectric Effect of Current-Induced Magnetization in a Toroidal Magnetic Ordered State of UNi₄B'
Hiraku Saito, Kenta Uenishi, Naoyuki Miura, Chihiro Tabata, Hiroyuki Hidaka, Tatsuya Yanagisawa, and Hiroshi Amitsuka
J. Phys. Soc. Jpn. 87 (2018) 033702. [Editor's Choice] [arXiv/1801.04660]

'Magnetoelastic phenomena in antiferromagnetic uranium intermetallics: The UAu₂Si₂ case'
M. Vališka, H. Saito, T. Yanagisawa, C. Tabata, H. Amitsuka, K. Uhlířová, J. Prokleška, P. Proschek, J. Valenta, M. Míšek, D. I. Gorbunov, J. Wosnitza, and V. Sechovský
Phys. Rev. B 98 (2018) 174439.

'Superconductivity in single crystalline ThBe₁₃ and LuBe₁₃'
Klára Uhlířová, Naoyuki Miura, Vladimír Tkáč, Jan Prokleška, Maciej Chrobak, Zbigniew Tarnawski, Hiroyuki Hidaka, Tatsuya Yanagisawa, Vladimír Sechovský, and Hiroshi Amitsuka
Physica B: Condensed Matter 536 (2018) 516.

'Low-temperature x-ray crystal structure analysis of the cage-structured compounds MBe₁₃(M=La, Sm, and U)'
Hiroyuki Hidaka, Ryoma Nagata, Chihiro Tabata, Yusei Shimizu, Naoyuki Miura, Tatsuya Yanagisawa, and Hiroshi Amitsuka
Phys. Rev. Materials 2 (2018) 053603.[arXiv/1804.10311]

'Uncompensated Antiferromagnetic Ordering of UAu₂Si₂ Studied by ²⁹Si-NMR'
C. Tabata, Y. Ihara, S. Shimmura, N. Miura, H. Hidaka, T. Yanagisawa, H. Amitsuka
J. Phys. Soc. Jpn. 87 (2018) 114707.

▶ 2017

'Magnetically Ordered State and Crystalline-Electric-Field Effects in SmBe₁₃'
Hiroyuki Hidaka, Seigo Yamasaki, Yusei Shimizu, Naoyuki Miura, Chihiro Tabata, Tatsuya Yanagisawa, and Hiroshi Amitsuka
J. Phys. Soc. Jpn. 86 (2017) 074703.

'Sm Valence States and Magnetic Properties in SmBe₁₃ and SmTi₂Al₂₀ Investigated by Sm Synchrotron-Radiation-Based Mössbauer Spectroscopy'
Satoshi Tsutsui, Yoshio Kobayashi, Jin Nakamura, Michael K. Kubo, Shota Amagasa , Yasuhiro Yamada, Yoshitaka Yoda, Yusei Shimizu, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi Amitsuka, Akira Yamada, Ryuji Higashinaka, Tatsuma D. Matsuda and Yuji Aoki
Hyperfine Interactions 238 (2017) 100.

'Observation of Low-Energy Einstein Phonon and Superconductivity in Single-Crystalline LaBe₁₃'
Hiroyuki HIDAKA, Yusei SHIMIZU, Seigo YAMAZAKI, Naoyuki MIURA, Ryoma NAGATA, Chihiro TABATA, Shota MOMBETSU, Tatsuya YANAGISAWA, Hiroshi AMITSUKA
J. Phys. Soc. Jpn. 86 (2017) 023704.

▶ 2016

'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
Phys. Rev. B 94 (2016) 205140. [arXiv/1611.00318]

'Peculiar Magnetism of UAu₂Si₂'
Chihiro Tabata, Naoyuki Miura, Klára Uhlířová, Michal Vališka, Hiraku Saito, Hiroyuki Hidaka, Tatsuya Yanagisawa, Vladimír Sechovský, and Hiroshi Amitsuka
Phys. Rev. B 94 (2016) 214414. [arXiv/1608.06035]

'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
Phys. Rev. B 94 (2016) 084152. [arXiv/1608.01066]
▶ Highlights

'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
J. Phys. Soc. Jpn. 85 (2016) 043704. [arXiv/1603.09069]
▶ Highlights

'Synchrotron Radiation Mössbauer Spectroscopy Using ¹⁴⁹Sm Nuclei'
Satoshi Tsutsui, Ryo Masuda, Yasuhiro Kobayashi, Yoshitaka Yoda, Kota Mizuuchi, Yusei Shimizu, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi Amitsuka, Fumitoshi Iga, and Makoto Seto
J. Phys. Soc. Jpn. 85 (2016) 083704.

'High Magnetic Field Study of Elastic Constants of the Cage-structure Compound SmBe₁₃'
S. Mombetsu, T. Murazumi, K. Hiura, S. Yamazaki, Y. Shimizu, H. Hidaka, T. Yanagisawa, H. Amitsuka, S. Yasin, S. Zherlitsyn and J. Wosnitza
J. Phys. Conf. Ser. 683 (2016) 012032.

'Magnetic anisotropy and thermodynamic anomaly in the superconducting mixed state of UBe₁₃ probed by static dc magnetization measurements'
Yusei Shimizu, Yoshinori Haga, T. Yanagisawa, and Hiroshi Amitsuka
Phys. Rev. B 93 (2015) 024502.

▶ 2015

'Nonmagnetic ground state in the cubic compounds PrNi₂Cd₂₀ and PrPd₂Cd₂₀'
D. Yazici, T. Yanagisawa, B. D. White, and M. B. Maple
Phys. Rev. B 91 (2015) 115136.

'Pressure-Temperature Phase Diagram of CeAg'
Hiroyuki HIDAKA, Shinya OTANI, Hiraku SAITO, Kaori TATSUMI, Tatsuya Yanagisawa and Hiroshi AMITSUKA
J. Mag. Mag. Mater. 385 (2015) 428-432.

'Ultrasonic Investigation of Magnetic Ordering with Higher-Order Interactions in the Cage-Structured Compound U₃Pd₂₀Si₆'
T. Yanagisawa, Kenta Hiura, Shota Mombetsu, Taro Murazumi, Hiroyuki Hidaka, Hiroshi Amitsuka, Naoyuki Tateiwa, and Yoshinori Haga
J. Phys. Conf. Ser. 592 (2015) 012095.

▶ 2014

'Muon spin rotation and relaxation in Pr_1-xNd_xOs₄Sb₁₂: magnetic and superconducting ground states'
D. E. MacLaughlin, P.-C. Ho, L. Shu, O. O. Bernal, S. Zhao, A. A. Dougraghi, T. Yanagisawa, M. B. Maple, and R. H. Fukuda
Phys. Rev. B 89 (2014) 144419.

'Muon spin rotation and relaxation in Pr_1-xNd_xOs₄Sb₁₂: paramagnetic states'
P.-C. Ho, D. E. MacLaughlin, L. Shu, O. O. Bernal, S. Zhao, A. A. Dougraghi, T. Yanagisawa, M. B. Maple, and R. H. Fukuda
Phys. Rev. B 89 (2014) 235111.

'Ultrasonic Study of the Hidden Order and Heavy-Fermion State in URu₂Si₂ with Hydrostatic Pressure, Rh-doping, and High-Magnetic Fields'
Tatsuya Yanagisawa
Philosophical Magazine 94 (2014) 3775-3788. [arXiv/1312.3084]

'X-ray backscattering study of crystal lattice distortion in hidden order of URu₂Si₂'
C. Tabata, T. Inami, S. Michimura, M. Yokoyama, H. Hidaka, T. Yanagisawa & H. Amitsuka
Philosophical Magazine 94 (2014) 3691-3701.

'Simultaneous Measurements of Elastic Constant and Resistivity near the T_c of Non-BCS-Type Superconductor PrOs₄Sb₁₂'
Shota Mombetsu, Taro Murazumi, Kenta Hiura, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi Amitsuka, and M. Brian Maple
JPS Conf. Proc. 3 (2014) 015021.

'DC Magnetization Study on Heavy-Electron Superconductor UBe₁₃'
Yusei Shimizu, Yoshinori Haga, Tatsuya Yanagisawa, Hiroshi Amitsuka, Dai Aoki, Jean-Pascal Brison, and Daniel Braithwaite
JPS Conf. Proc. 3 (2014) 015009.

'Polarized Light Microscopic Study of the Hidden Order Phase in URu₂Si₂'
Chihiro Tabata, Masashi Tokunaga, Makoto Yokoyama, Hiroyuki Hidaka, Tatsuya Yanagisawa and Hiroshi Amitsuka
JPS Conf. Proc. 3 (2014) 011062.

▶ 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
Phys. Rev. B 88 (2013) 195150. [arXiv/1311.3748]
▶ Highlights

'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
J. Phys. Soc. Jpn. 82 (2013) 013601. [arXiv/1211.7185]
▶ Highlights

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近年、複数の4f電子を持つ希土類元素を含む金属間化合物において、電子間の強い相互作用により伝導電子の有効質量が増大する「重い電子状態」が発見され、その性質や発現機構が問題になっています。重い電子状態は、CeやYbの化合物についてはよく研究されており、理解が進んでいます。それに対し、PrやSm、Euなどを主体とした化合物については、実験的な傍証が少なく、理解が進んでいるとは言い難い状況です。一般に、原子番号が大きい希土類ほどフェルミエネルギーから深い位置に4f準位を持つため、伝導電子と4f電子間の混成（c-f混成）による重い電子状態を形成しにくいと考えられています。一方で、多数の配位子が希土類イオンを取り囲むカゴ状構造を持つ場合、混成する経路が多くなり、強いc-f混成効果が期待できます。実際に、PrやSmを含むカゴ状化合物において、風変わりな重い電子状態が発見されております。例えば、Smの重い電子系カゴ状化合物では、重い電子系Ce化合物にないような、磁場に鈍感な重い電子状態と磁気秩序が発見され、注目が集められています。さらに、カゴ状化合物では強いc-f混成効果だけではなく、結晶場の擬縮退による多極子自由度や、ゲスト希土類イオンの非調和振動（ラットリング）が生じ、それらが低温物性に大きな影響を及ぼすと考えられています。
本研究で取り上げる充填スクッテルダイトSmOs₄Sb₁₂は、比熱から見積もられる電子比熱係数が820 mJ mol^-1 K^-2と大きく、重い電子状態を形成していると考えられています。この電子比熱係数の値は8 Tの外部磁場中でもほとんど変化せず、磁場によって抑制されるCe化合物の重い電子状態とは対照的です。この磁場に鈍感な重い電子状態の発現機構としては、ラットリングに起因した局所電荷揺らぎや価数揺らぎを起源とするものが理論提案されています。また、本系はT_C ~ 2.5 Kで弱い強磁性モーメントを伴った相転移を示します。この低温秩序相における強磁性については、遍歴強磁性の可能性と、多極子秩序に伴う寄生モーメントの可能性が指摘されており、争点となっています。
4f電子と伝導電子のかかわる複雑な多体量子系を理解するためには、4f電子系が低温で持ちうる多極子自由度を規定する結晶場基底状態についての情報が重要です。しかし、本系においては2つの結晶場模型が提案されており、未だ決着が付いておりません。また、本系の低温におけるc-f混成効果を4f電子の局在モーメントの応答から議論した例はなく、c-f混成の低温物性への影響は明らかになっていませんでした。そこで、本研究では、SmOs₄Sb₁₂の重い電子状態の形成にc-f混成効果とラットリングによる電荷揺らぎのどちらが本質的なのかを明らかにすることと、低温秩序相における多極子自由度の寄与を調べることを目的とし、局在電子系の四極子モーメントの応答や局所電荷揺らぎを観測できる、超音波測定をパルス磁場中、ならびに、静水圧力下で行ないました。
一般に、強いc-f混成がある場合、低温・低磁場では局在電子模型による結晶場準位の決定は困難です。そこで、本研究では、パルス強磁場を用いた超音波弾性定数測定により、c-f混成のエネルギースケールを越えた領域での弾性応答から結晶場基底状態の決定を試みました。本研究のパルス磁場中弾性定数測定では、4.2 Kにおいて弾性定数C₄₄が10 T以下の低磁場で減少し、高磁場側で増大する振る舞いが観測されました。また、磁場印加に伴い弾性定数C₁₁が増大する振る舞いが観測されました。これらの弾性応答には、結晶場基底状態の対称性に関する明瞭な選択則が現れており、Γ₆₇四重項基底状態を強く示唆します。さらに、ゼロ磁場の弾性定数の温度変化から歪み-四極子結合定数を決定し、それを用いて弾性定数の磁場変化の定量的な計算を行ないました。この局在模型を用いた計算の示す変化量が、実験結果の弾性定数C₄₄の10 T以上の変化量とほぼ一致したことから、少なくとも20 T以上での高磁場領域で局在性が回復していることが示唆されます。また、低磁場側での計算結果との不一致は、低温・低磁場では局在模型が適用できず、c-f混成が支配的であることを改めて裏付ける結果です。

Our ultrasound results obtained in pulsed magnetic fields show that the filled-skutterudite compound SmOs₄Sb₁₂ has the Γ₆₇ quartet crystalline-electric-field ground state. This fact suggests that the multipolar degrees of freedom of the Γ₆₇ quartet play an important role in the unusual physical properties of this material. On the other hand, the elastic response below ≈20 T cannot be explained using the localized 4 f-electron model, which does not take into account the Kondo effect or ferromagnetic ordering. The analysis result suggests the presence of a Kondo-like screened state at low magnetic fields and its suppression at high magnetic fields above 20 T even at low temperatures.

For more information please see our paper: S. Mombetsu et al., J. Phys. Soc. Jpn. 85 (2016) 043704.

(also available on arXiv:1603.09069 [cond-mat.str-el])