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Journal Articles

Unveiling unconventional magnetism at the surface of Sr$$_2$$RuO$$_4$$

Fittipaldi, R.*; Hartmann, R.*; Mercaldo, M. T.*; Komori, Sachio*; Bj${o}$rlig, A.*; Higemoto, Wataru; Maeno, Yoshiteru*; Di Bernardo, A.*; 18 of others*

Nature Communications (Internet), 12, p.5792_1 - 5792_9, 2021/10

https://doi.org/10.1038/s41467-021-26020-5
 Times Cited Count：11 Percentile：68.91(Multidisciplinary Sciences)

The layered oxide perovskite Sr$$_2$$RuO$$_4$$, which has been intensively investigated due to its unusual properties. Whilst the debate on the symmetry of the superconducting state in Sr$$_2$$RuO$$_4$$ is still ongoing, a deeper understanding of the Sr$$_2$$RuO$$_4$$ normal state appears crucial as this is the background in which electron pairing occurs. Here, by using low-energy muon spin spectroscopy we discover the existence of surface magnetism in Sr$$_2$$RuO$$_4$$ at an onset temperature higher than 50 K. Our observations set a reference for the discovery of the same magnetic phase in other materials.

Journal Articles

High-temperature antiferromagnetism in Yb based heavy fermion systems proximate to a Kondo insulator

Suzuki, Shintaro*; Takubo, Ko*; Kuga, Kentaro*; Higemoto, Wataru; Ito, Takashi; Tomita, Takahiro*; Shimura, Yasumichi*; Matsumoto, Yosuke*; Bareille, C.*; Wadachi, Hiroki*; et al.

Physical Review Research (Internet), 3(2), p.023140_1 - 023140_12, 2021/05

https://doi.org/10.1103/PhysRevResearch.3.023140

We report our experimental discovery of the transition temperature reaching 20 K in a Yb-based compound at ambient pressure. The Mn substitution at the Al site in an intermediate valence state of $$alpha$$-YbAlB$$_4$$ not only induces antiferromagnetic transition at a record high temperature of 20 K but also transforms the heavy-fermion liquid state in $$alpha$$-YbAlB$$_4$$ into a highly resistive metallic state proximate to a Kondo insulator.

Journal Articles

Pressure dependence of ferromagnetic phase boundary in BaVSe$$_3$$ studied with high-pressure $$mu^+$$SR

Sugiyama, Jun; Higemoto, Wataru; Andreica, D.*; Forslund, O. K.*; Nocerino, E.*; M${aa}$nsson, M.*; Sassa, Y.*; Gupta, R.*; Khasanov, R.*; Ota, Hiroto*; et al.

Physical Review B, 103(10), p.104418_1 - 104418_10, 2021/03

https://doi.org/10.1103/PhysRevB.103.104418
 Times Cited Count：8 Percentile：60.77(Materials Science, Multidisciplinary)

The magnetic nature of a quasi-one-dimensional compound, BaVSe$$_3$$, has been investigated with positive muon spin rotation and relaxation measurements at ambient and high pressures. At ambient pressure, the spectrum recorded under zero external magnetic field exhibited a clear oscillation below the Curie temperature due to the formation of quasistatic ferromagnetic order. As pressure increased from ambient pressure, $$T_{C}$$ was found to decrease slightly up to about 1.5 GPa, at which point $$T_{C}$$ started to increase rapidly with the further increase of the pressure. Based on a strong ferromagnetic interaction along the $$c$$-axis, the result revealed that there are two magnetic interactions in the ab-plane.

Oral presentation

Anisotropy of spontaneous magnetic field in superconducting state of Sr$$_2$$RuO$$_4$$

Higemoto, Wataru; Okazawa, Takeshi; Ito, Takashi; Oda, Yuto*; Yoshida, Yoshiyuki*

no journal, , 

no abstracts in English

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