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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：7 パーセンタイル：43.28(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 URuSi

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：8 パーセンタイル：43.65(Materials Science, Multidisciplinary)

We performed synchrotron X-ray diffraction measurements on a small single crystal of URuSi. A backscattering diffraction setup (2) 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 denotes a lattice-plane spacing and 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 URuSi 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：15 パーセンタイル：29.11(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：7 パーセンタイル：46.84(Physics, Multidisciplinary)

Low-temperature specific heat measurements under magnetic field were performed on a single crystal UBe $_{13}$ . The specific heat shows a behavior below 0.7 $_{rm c}$ , where $_{rm c}$ 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

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：86.85(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

Ultrasonic measurements on the cage-structured clathrate compound UPd $_{20}$ Si

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：68.12(Physics, Multidisciplinary)

Ultrasonic measurements of UPd $_{20}$ Si were performed in order to investigate elastic properties of the cage-structured compound UPd $_{20}$ Si. 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-electrons or a possible contribution of a ferroquadrupole interaction to the antiferromagnetism in UPd $_{20}$ Si.

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：29.3

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)Sb $_{12}$ and (Pr,La)OsSb $_{12}$

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：19 パーセンタイル：33.01(Materials Science, Multidisciplinary)

Zero- and longitudinal-field muon spin relaxation experiments have been carried out in the alloy series Pr(Os $_{1-x}$ Ru)Sb $_{12}$ and Pr $_{1-y}$ LaOsSb $_{12}$ to elucidate the anomalous dynamic muon spin relaxation observed in these materials. The damping rate associated with this relaxation varies with temperature, applied magnetic field, and dopant concentrations and 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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