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山内 宏樹; Sari, D. P.*; 安井 幸夫*; 坂倉 輝俊*; 木村 宏之*; 中尾 朗子*; 大原 高志; 本田 孝志*; 樹神 克明; 井川 直樹; et al.
Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02
-Mn-type family alloys Mn
have three-dimensional antiferromagnetic (AFM) corner-shared triangular network. The antiferromagnet Mn
RhSi shows magnetic short-range order (SRO) over a wide temperature range of approximately 500 K above the N
el temperature
= 190 K. Mn
CoSi has the smallest lattice parameter and the lowest
in the family compounds. The quantum critical point (QCP) from AFM to the quantum paramagnetic state is expected near a cubic lattice parameter of 6.15
of Mn
CoSi is only 140 K, quantum critical behavior is observed in Mn
CoSi as the enhancement of the electronic specific heat coefficient
. We study how the magnetic SRO appears in Mn
CoSi by using neutron scattering,
SR, and physical property measurements. The experimental results show that the neutron scattering intensity of the magnetic SRO does not change much regardless of the suppressed magnetic moment in the long-range magnetic ordered state compared to those of Mn
RhSi. The initial asymmetry drop ratio of
SR above
becomes small, and the magnetic SRO temperature
is suppressed to 240 K. The results suggest that the Mn
CoSi is close to the QCP in the Mn
system.
Tam, D. M.*; Song, Y.*; Man, H.*; Cheung, S. C.*; Yin, Z.*; Lu, X.*; Wang, W.*; Frandsen, B. A.*; Liu, L.*; Gong, Z.*; et al.
Physical Review B, 95(6), p.060505_1 - 060505_6, 2017/02
被引用回数:24 パーセンタイル:68.44(Materials Science, Multidisciplinary)We use neutron diffraction and muon spin relaxation to study the effect of in-plane uniaxial pressure on the antiferromagnetic (AF) orthorhombic phase in BaFeT
As
and its Co- and Ni-substituted members near optimal superconductivity. In the low-temperature AF ordered state, uniaxial pressure necessary to detwin the orthorhombic crystals also increases the magnetic ordered moment, reaching an 11% increase under 40 MPa for BaFe
Co
As
, and a 15% increase for BaFe
Ni
As
. We also observe an increase of the AF ordering temperature (
) of about 0.25 K/MPa in all compounds, consistent with density functional theory calculations that reveal better Fermi surface nesting for itinerant electrons under uniaxial pressure. The doping dependence of the magnetic ordered moment is captured by combining dynamical mean field theory with density functional theory, suggesting that the pressure-induced moment increase near optimal superconductivity is closely related to quantum fluctuations and the nearby electronic nematic phase.
下村 浩一郎*; 門野 良典*; 西山 樟生*; 渡辺 功雄*; 鈴木 栄男*; Pratt, F.*; 大石 一城; 水田 正志*; 斎藤 峯雄*; Chow, K. H.*; et al.
Physica B; Condensed Matter, 376-377, p.444 - 446, 2006/04
被引用回数:1 パーセンタイル:6.14(Physics, Condensed Matter)Recent progresses of the studies of isolated hydrogen center in ZnO and GaN by muon spin rotation methods are reported. Preliminary experimental results for shallow muonium hunting as an acceptor in InSb and GaSb are also discussed.