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Journal Articles

Superconductivity in a multiorbital model for the $$Gamma_3$$ crystalline electric field state

Kubo, Katsunori

AIP Advances (Internet), 8(10), p.101313_1 - 101313_6, 2018/10

 Times Cited Count:3 Percentile:24.63(Nanoscience & Nanotechnology)

Journal Articles

Schottky specific heat of the lightly Mn-substituted electron-doped SrTiO$$_3$$

Okuda, Tetsuji*; Kajimoto, Ryoichi; Noda, Masaaki*; Kuwahara, Hideki*

AIP Advances (Internet), 8(10), p.101339_1 - 101339_5, 2018/10

 Times Cited Count:0 Percentile:0(Nanoscience & Nanotechnology)

Journal Articles

Effects of Fe doping on anomalous specific heat and XAFS oscillation in antiferromagnetic metal Mn$$_3$$Si

Hiraka, Haruhiro*; Oyama, Kenji*; Kosaka, Masashi*; Matsumura, Daiju

AIP Advances (Internet), 8(10), p.101424_1 - 101424_5, 2018/10

 Times Cited Count:0 Percentile:0(Nanoscience & Nanotechnology)

Oral presentation

Magnetic Bragg dip and Bragg edge in neutron transmission spectra of a typical spin order

Mamiya, Hiroaki*; Oba, Yojiro; Terada, Noriki*; Watanabe, Norimichi*; Hiroi, Kosuke; Shinohara, Takenao; Oikawa, Kenichi

no journal, , 

So far, neutron diffractometry has been a unique tool to clarify spin arrangements. However, it is not easy to measure the neutron diffraction under extreme sample environments such as high pressure and high magnetic field because such environments often require large equipments surrounding the samples and prevent the measurement of the scattered neutron. To overcome this issue, we focused on neutron transmission spectra, which includes the attenuation caused by the neutron diffraction. The neutron transmission spectra can be easily measured using only a transmission monitor without scattering detector. This presentation reports the first observation of the neutron transmission spectra generated by a typical spin order in nickel oxides. The results clearly show the neutron transmission spectroscopy is a promising tool for the study of the spin arrangements.

Oral presentation

Ferromagnetic superconductivity mediated by pressure-enhanced spin fluctuation developed around the phase boundary of FM1 and FM2 in UGe$$_2$$

Tateiwa, Naoyuki; Haga, Yoshinori; Yamamoto, Etsuji

no journal, , 

We study the dynamical magnetic property under high pressure in uranium ferromagnetic superconductor UGe$$_2$$ from the analysis of magnetic data with Takahashi's spin fluctuation theory. We determined the pressure dependencies of spin fluctuation parameters $$T_0$$ and $$T_{rm A}$$, the widths of the spin fluctuation spectrum in the energy and the momentum spaces, respectively. $$T_0$$ and $$T_{rm A}$$ show anomalous behavior around pressure region where the superconductivity appears. We suggests that the superconductivity in UGe$$_2$$ is mediated by pressure-enhanced spin fluctuation developed around the phase boundary of two ferromagnetic phases FM1 and FM2.

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