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論文

Anisotropic magnetic field-temperature phase diagrams in CeCoSi

日高 宏之*; 柳谷 駿*; 小野寺 進太朗*; 柳澤 達也*; 網塚 浩*; 谷田 博司*; 石飛 尊之

Journal of the Physical Society of Japan, 94(3), p.034706_1 - 034706_9, 2025/03

https://doi.org/10.7566/JPSJ.94.034706
 被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

We investigated the magnetic-field direction anisotropy of the unknown ordered phase in the tetragonal compound CeCoSi through bulk physical property measurements. The anisotropy in the field direction, previously identified in X-ray diffraction experiments, where a field-induced phase appears along [100] but not along [110], was confirmed in the bulk properties. Combining these experimental results with Landau theory, we infer that the field-induced phase in the [100] direction emerges under an infinitesimally small magnetic field.

論文

Dramatic elastic response at the critical end point in UTe$$_2$$

Vali$v{s}$ka, M.*; Haidamak, T.*; Cabala, A.*; Posp$'i$$v{s}$il, J.*; Bastien, G.*; Sechovsk$'y$, V.*; Prokle$v{s}$ka, J.*; 柳澤 達也*; Opletal, P.; 酒井 宏典; et al.

Physical Review Materials (Internet), 8(9), p.094415_1 - 094415_9, 2024/09

https://doi.org/10.1103/PhysRevMaterials.8.094415
 被引用回数：2 パーセンタイル：0.00(Materials Science, Multidisciplinary)

Elastic responses at the metamagnetic transition in UTe$$_2$$ are studied at high field. The elastic anomaly becomes the strongest at the critical-end-point. Similar behavior was also observed in another metamagnet UCoAl, suggesting a universal elastic response triggered by critical magnetic fluctuations.

論文

Polarized neutron diffraction study on UPt$$_{2}$$Si$$_{2}$$

今 布咲子*; 田端 千紘; 齋藤 開*; 中島 多朗*; 日高 宏之*; 柳澤 達也*; 網塚 浩*

Journal of the Physical Society of Japan, 93(4), p.044701_1 - 044701_11, 2024/04

https://doi.org/10.7566/JPSJ.93.044701
 被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)

We investigated the magnetic structure of the antiferromagnetic (AFM) ordered state ($$T_{rm N}$$ $$sim$$ 34 K) in tetragonal UPt$$_{2}$$Si$$_{2}$$ using polarized and unpolarized neutron diffraction. Previous neutron scattering studies reported that this system possesses a simple AFM structure with a propagation vector, Q= 0, and the ordered magnetic moments aligned along the c-axis. By contrast, our latest resonant X-ray scattering (RXS) experiments have revealed that the magnetic structure is modulated by the charge-density-wave (CDW) order, which emerges in one of the two Pt atomic layers in the unit cell below $$sim$$320 K. The modulation is characterized by a transverse wave in the c-plane, with the propagation vector of the CDW order, q$$_{rm CDW}$$ = ($$sim$$0.42, 0, 0). In this study using neutron scattering, we observed that the superlattice reflections specified by q$$_{rm CDW}$$ develop below $$T_{rm N}$$, in addition to the magnetic reflections with Q= 0, thereby further confirming the presence of modulation in the AFM structure of this system. From detailed analyses, we revealed that the amplitude of the transverse-wave magnetic modulation is 0.72(2)$$mu$$$$_{rm B}$$/U, which is quantitative information that can not be obtained through RXS experiments. This implies that the CDW drives the ordered magnetic moments to be tilted up to 20$$^{circ}$$ in the AFM state. The observations strongly suggest that the magnetism of UPt$$_{2}$$Si$$_{2}$$ is heavily influenced by the hybridization effects between the $$5f$$ electrons of U and the 5d electrons of Pt.

論文

Magnetic anisotropy and thermodynamic anomaly in the superconducting mixed state of UBe$$_{13}$$ probed by static dc magnetization measurements

清水 悠晴*; 芳賀 芳範; 柳澤 達也*; 網塚 浩*

Physical Review B, 93(2), p.024502_1 - 024502_8, 2016/01

https://doi.org/10.1103/PhysRevB.93.024502
 被引用回数：8 パーセンタイル：35.02(Materials Science, Multidisciplinary)

Static dc magnetization measurements were performed for a heavy fermion superconductor UBe$$_{13}$$ single crystal. For the fields along the [100] and [110] directions of cubic lattice, a magnetic anomaly was found at a characteristic field $$H_{rm Mag}^{*}$$ within the superconducting mixed state. It was also found that magnetic anisotropy became more significant above this field. The present study shows that the thermodynamic property of superconductivity changes as a function of magnetic field.

論文

DC magnetization study on heavy-electron superconductor UBe$$_{13}$$

清水 悠晴*; 芳賀 芳範; 柳澤 達也*; 網塚 浩*; 青木 大*; Brison, J.-P.*; Braithwaite, D.*

JPS Conference Proceedings (Internet), 3, p.015009_1 - 015009_6, 2014/06

https://doi.org/10.7566/JPSCP.3.015009

Static DC magnetization measurements were performed in order to investigate magnetic response of the unconventional superconducting state of UBe$$_{13}$$. An unusual anomaly was observed inside the superconducting mixed state corresponding either to a peculiarity of superconducting diamagnetism or the anomalous vortex core structures.

論文

X-ray backscattering study of crystal lattice distortion in hidden order of URu$$_2$$Si$$_2$$

田端 千紘*; 稲見 俊哉; 道村 真司*; 横山 淳*; 日高 宏之*; 柳澤 達也*; 網塚 浩*

Philosophical Magazine, 94(32-33), p.3691 - 3701, 2014/00

https://doi.org/10.1080/14786435.2014.952701
 被引用回数：16 パーセンタイル：56.89(Materials Science, Multidisciplinary)

We performed synchrotron X-ray diffraction measurements on a small single crystal of URu$$_2$$Si$$_2$$. A backscattering diffraction setup (2$$thetasim179.81^circ$$) in combination with a Si(6 6 0) monochromator ensures a high instrumental resolution of $$Delta d/d sim 7.3 times 10^{-6}$$, where $$d$$ denotes a lattice-plane spacing and $$Delta d$$ is its spread expressed as the full width at half maximum (FWHM). We carefully measured the (5 5 0) Bragg peak in the temperature range between 5 and 25 K, and found it to show no signature of broadening and splitting when "Hidden Order (HO)" sets in below 17.5 K. Temperature variation of the peak position closely follows the behaviour of the known linear thermal expansion coefficient. Detailed analysis of the peak width reveals that the tetragonal fourfold rotational symmetry of URu$$_2$$Si$$_2$$ is conserved in HO within the experimental accuracy of the orthorhombicity of $$|b-a|/(b+a)leq3.0times10^{-5}$$.

論文

Observation of an unusual magnetic anomaly in the superconducting mixed state of heavy-fermion compound UBe$$_{13}$$ by precise dc magnetization measurements

清水 悠晴*; 芳賀 芳範; 池田 陽一*; 柳澤 達也*; 網塚 浩*

Physical Review Letters, 109(21), p.217001_1 - 217001_5, 2012/11

https://doi.org/10.1103/PhysRevLett.109.217001
 被引用回数：18 パーセンタイル：67.44(Physics, Multidisciplinary)

Precise dc magnetization measurements were performed on a heavy fermion superconductor UBe$$_{13}$$. We observed a magnetic anomaly in the superconducting mixed state, implying an unusual superconducting state. The origin of the anomaly is discussed based on an unusual superconducting response or a peculiar normal-state magnetization at the vortex cores.

論文

Maki parameter and upper critical field of the heavy-fermion superconductor UBe$$_{13}$$

清水 悠晴*; 池田 陽一*; 若林 琢巳*; 芳賀 芳範; 天谷 健一*; 日高 宏之*; 柳澤 達也*; 網塚 浩*

Journal of the Physical Society of Japan, 80(9), p.093701_1 - 093701_4, 2011/09

https://doi.org/10.1143/JPSJ.80.093701
 被引用回数：8 パーセンタイル：49.58(Physics, Multidisciplinary)

Low-temperature specific heat measurements under magnetic field were performed on a single crystal UBe$$_{13}$$. The specific heat shows a $$T^3$$ behavior below $$sim$$0.7 $$T$$$$_{rm c}$$, where $$T$$$$_{rm c}$$ is the superconducting transition temperature, suggesting the existence of point nodes in the superconducting gap. Together with the isotropic behavior of the upper critical magnetic field, the symmetry of the Cooper paring is discussed.

論文

Ultrasonic measurements on the cage-structured clathrate compound U$$_3$$Pd$$_{20}$$Si$$_6$$

柳澤 達也*; 立岩 尚之; 真山 太一*; 齋藤 旬*; 日高 宏之*; 網塚 浩*; 芳賀 芳範; 根本 祐一*; 後藤 輝孝*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA105_1 - SA105_3, 2011/07

https://doi.org/10.1143/JPSJS.80SA.SA105
 被引用回数：3 パーセンタイル：26.66(Physics, Multidisciplinary)

Ultrasonic measurements of U$$_3$$Pd$$_{20}$$Si$$_6$$ were performed in order to investigate elastic properties of the cage-structured compound U$$_3$$Pd$$_{20}$$Si$$_6$$. At temperatures over antiferromagnetic ordering at $$T_{rm N}$$ = 19 K, neither an up-turn anomaly nor frequency dependence of the elastic constants, regarding the ultrasonic dispersion (UD), was found. A drastic change of $$C_{44}$$ mode at $$T_{rm N}$$, in particular, implies a strong magneto-elastic coupling of 5$$f$$-electrons or a possible contribution of a ferroquadrupole interaction to the antiferromagnetism in U$$_3$$Pd$$_{20}$$Si$$_6$$.

論文

Specific heat and magnetization studies of the superconducting mixed state of UBe$$_{13}$$

清水 悠晴*; 池田 陽一*; 若林 琢巳*; 天谷 健一*; 芳賀 芳範; 日高 宏之*; 柳澤 達也*; 網塚 浩*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA100_1 - SA100_3, 2011/07

https://doi.org/10.1143/JPSJS.80SA.SA100
 被引用回数：1 パーセンタイル：10.96(Physics, Multidisciplinary)

Low-temperature specific heat and static dc magnetization measurements have been performed in the superconducting state of the heavy-fermion compound UBe$$_{13}$$. The superconducting phase diagram was obtained from these measurements. We obtained Ginzburg-Landau parameter as a function of temperature and showed that a paramagnetic effect is present down to 0.5 K.

論文

Magnetization in the superconducting mixed state of the heavy-fermion compound UBe$$_{13}$$

清水 悠晴*; 池田 陽一*; 若林 琢巳*; 天谷 健一*; 芳賀 芳範; 日高 宏之*; 柳澤 達也*; 網塚 浩*

Journal of Physics; Conference Series, 273, p.012084_1 - 012084_4, 2011/02

https://doi.org/10.1088/1742-6596/273/1/012084
 被引用回数：3 パーセンタイル：61.66(Physics, Condensed Matter)

Static dc magnetization measurements in the superconducting mixed state of a single crystal UBe$$_{13}$$ were performed by means of a capacitance Faraday-force method down to 0.24 K. Below the upper critical field $$B_{c2}$$, not only a peak effect but also an additional broad anomaly have been observed in magnetization curves. We report superconducting phase diagram of UBe$$_{13}$$ obtained by our magnetization measurements, including these anomalies.

論文

Muon spin relaxation and hyperfine-enhanced $$^{141}$$Pr nuclear spin dynamics in Pr(Os,Ru)$$_4$$Sb$$_{12}$$ and (Pr,La)Os$$_4$$Sb$$_{12}$$

Shu, L.*; MacLaughlin, D. E.*; 青木 勇二*; 綱島 慶乃*; 米澤 祐樹*; 真田 祥太郎*; 菊地 大輔*; 佐藤 英行*; Heffner, R. H.; 髭本 亘; et al.

Physical Review B, 76(1), p.014527_1 - 014527_8, 2007/07

https://doi.org/10.1103/PhysRevB.76.014527
 被引用回数：22 パーセンタイル：64.99(Materials Science, Multidisciplinary)

Zero- and longitudinal-field muon spin relaxation experiments have been carried out in the alloy series Pr(Os$$_{1-x}$$Ru$$_x$$)$$_4$$Sb$$_{12}$$ and Pr$$_{1-y}$$La$$_y$$Os$$_4$$Sb$$_{12}$$ to elucidate the anomalous dynamic muon spin relaxation observed in these materials. The damping rate $$Lambda$$ associated with this relaxation varies with temperature, applied magnetic field, and dopant concentrations $$x$$ and $$y$$ in a manner consistent with the "hyperfine enhancement" of $$^{141}$$Pr nuclear spins. This mechanism arises from Van Vleck-like admixture of magnetic Pr$$^{3+}$$ crystalline-electric-field-split excited states into the nonmagnetic singlet ground state by the nuclear hyperfine coupling, thereby increasing the strengths of spin-spin interactions between $$^{141}$$Pr and muon spins and within the $$^{141}$$Pr spin system. We find qualitative agreement with this scenario and conclude that electronic spin fluctuations are not directly involved in the dynamic muon spin relaxation.

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