Zobrazeno 1 - 10
of 482
pro vyhledávání: '"Machi, T."'
Publikováno v:
Journal of Physics: Conf. Series 1054 (2018) 012006
We estimated the ratios of $^{63}$Cu hyperfine coupling constants in the double-layer high-$T_\mathrm{c}$ superconductor HgBa$_2$CaCu$_2$O$_{6+\delta}$ from the anisotropies in Cu nuclear spin-lattice relaxation rates and spin Knight shifts to study
Externí odkaz:
http://arxiv.org/abs/1712.04656
Publikováno v:
Phys. Rev. B 96, 235118 (2017)
The magnitude of the powder spin susceptibility of an optimally doped superconductor HgBa$_2$CuO$_{4+\delta}$ (Hg1201) in the normal state is found to be nearly the same as that of La$_{2-x}$Sr$_{x}$CuO$_{4}$ near the optimally doped level. The Stone
Externí odkaz:
http://arxiv.org/abs/1712.00652
Publikováno v:
Phys. Rev. B 95, 094501 (2017)
We report the transverse relaxation rates 1/$T_2$'s of the $^{63}$Cu nuclear spin-echo envelope for double-layer high-$T_c$ cuprate superconductors HgBa$_{2}$CaCu$_{2}$O$_{6+d}$ from underdoped to overdoped. The relaxation rate 1/$T_{2L}$ of the expo
Externí odkaz:
http://arxiv.org/abs/1702.04592
Akademický článek
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Publikováno v:
J. Phys. Soc. Jpn. 82 (2013) 095002
We successfully observed the frequency distribution of Cu nuclear spin-lattice relaxation time in the superconducting state of single crystals Bi2212, which we believe corresponds to a theoretical suggestion from the analysis of the energy gap distri
Externí odkaz:
http://arxiv.org/abs/1307.7462
Publikováno v:
J. Phys. Soc. Jpn. 82 (2013) 055001/1-2
We report on Cu nuclear quadrupole resonance (NQR) and NMR studies of an optimally hole-doped superconductor Ca2-xNaxCuO2Cl2 (Tc ~ 28 K for x ~ 0.2). In spite of robust oxygen composition, we observed a multiple broad NQR frequency spectrum and nonex
Externí odkaz:
http://arxiv.org/abs/1304.0512
Autor:
Ota, K., Hamada, K., Takemura, R., Ohmaki, M., Machi, T., Tanabe, K., Suzuki, M., Maeda, A., Kitano, H.
Publikováno v:
Phys. Rev. B 79, 134505 (2009)
We investigated macroscopic quantum tunneling (MQT) of Bi$_2$Sr$_2$CaCu$_2$O$_y$ intrinsic Josephson junctions (IJJs) with two device structures. One is a nanometer-thick small mesa structure with only two or three IJJs and the other is a stack of a
Externí odkaz:
http://arxiv.org/abs/0807.1194
Publikováno v:
in ""Superconducting Cuprates: Properties, Preparation and Applications" (Nova Science Publisher, NY, USA 2009) p.p. 235 - 268
A brief review of microscopic studies of high-Tc superconductors HgBa2CuO4+d and HgBa2CaCu2O6+d is presented. The topics concerned are the pseudo spin-gap, the antiferromagnetic spin fluctuations near the quantum critical point, and the mechanism of
Externí odkaz:
http://arxiv.org/abs/0804.0911
Autor:
Machi, T., Kato, I., Hareyama, R., Watanabe, N., Itoh, Y., Koshizuka, N., Arai, S., Murakami, M.
Publikováno v:
Physica C 388-389 (2003) 233
The effects of nonmagnetic Zn and magnetic Ni substitution for Cu site on magnetism are studied by measurements of uniform magnetic susceptibility for lightly doped La_{2-x}Sr_xCu_{1-z}M_zO_4 (M=Zn or Ni) polycrystalline samples. For the parent x=0,
Externí odkaz:
http://arxiv.org/abs/cond-mat/0304482
Publikováno v:
Phys. Rev. B 67, 064516 (2003)
We studied local electronic states near Zn in optimally doped YBa$_2$(Cu$_{1-x}$Zn_x)$_3$O$_{7-\delta}$ and underdoped YBa$_2$(Cu$_{1-x}$Zn_x)$_4$O$_8$ via satellite signals of plane-site Cu(2) nuclear quadrupole resonance (NQR) spectra. From the rel
Externí odkaz:
http://arxiv.org/abs/cond-mat/0301432