T. Adachi

Growth, Annealing Effects on Superconducting and Magnetic Properties, and Anisotropy of FeSe1-xTex (0.5≤x≤1) Single Crystals

Single crystals of FeSe 1- x Te x (0.5≤ x ≤1) have been grown by the Bridgman method. After annealing them at 400 °C for 100 h in vacuum, single crystals of x =0.5–0.9 have exhibited bulk superconductivity. Anisotropic properties of the electrical resistivity and upper critical field, H c2 , have been investigated for the single-crystal FeSe 1- x Te x with x =0.6. It has been found that the in-plane resistivity, ρ a b , shows a metallic temperature-dependence, while the out-of-plane resistivity, ρ c , shows a broad maximum around 100 K. The resistivity ratio, ρ c /ρ a b , is 44 and 70 at 290 K and just above the superconducting transition temperature, T c , respectively. The anisotropic parameter, γ≡ H c2 || / H c2 ⊥ (superscripts ∥ and ⊥ indicate field directions parallel and perpendicular to the a b -plane, respectively.), is estimated as 2.7 just below T c .

Spin gap and hole pairing in the spin-ladder cuprate Sr14-xAxCu24O41 (A=Ca and La) studied by the thermal conductivity

We have systematically measured the thermal conductivity κ of Sr 14- x A x Cu 24 O 41 (A=Ca, La: 0≤ x ( Ca) ≤9: 0 ≤ x ( La) ≤5) single crystals, in order to investigate the spin gap and hole pairin...

Superconducting Volume Fraction in Overdoped Regime of La2-xSrxCuO4: Implication for Phase Separation from Magnetic-Susceptibility Measurement

We have grown a single crystal of La 2- x Sr x CuO 4 in which the Sr concentration, x , continuously changes from 0.24 to 0.29 in the overdoped regime and obtained many pieces of single crystals with different x values by slicing the single crystal. From detailed measurements of the magnetic susceptibility, χ, of each piece, it has been found that the absolute value of χ at the measured lowest temperature 2 K, |χ 2 K |, on field cooling rapidly decreases with increasing x as well as the superconducting (SC) transition temperature. As the value of |χ 2 K | is regarded as corresponding to the SC volume fraction in a sample, it has been concluded that a phase separation into SC and normal-state regions occurs in a sample of La 2- x Sr x CuO 4 in the overdoped regime.We have grown a single crystal of La 2- x Sr x CuO 4 in which the Sr concentration, x , continuously changes from 0.24 to 0.29 in the overdoped regime and obtained many pieces of single crystals with different x values by slicing the single crystal. From detailed measurements of the magnetic susceptibility, χ, of each piece, it has been found that the absolute value of χ at the measured lowest temperature 2 K, |χ 2 K |, on field cooling rapidly decreases with increasing x as well as the superconducting (SC) transition temperature. As the value of |χ 2 K | is regarded as corresponding to the SC volume fraction in a sample, it has been concluded that a phase separation into SC and normal-state regions occurs in a sample of La 2- x Sr x CuO 4 in the overdoped regime.

Crystal growth, transport properties, and crystal structure of the single-crystal La2-xBaxCuO4 (x=0.11)

We have attempted the crystal growth by the traveling-solvent floating-zone (TSFZ) method of

Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

{\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Ba}}_{x}{\mathrm{CuO}}_{4}(x\ensuremath{\sim}1/8),

Neuropathological Asymmetry in Argyrophilic Grain Disease

where the superconductivity is strongly suppressed. Under flowing

Cu spin dynamics in the overdoped regime of La2-xSrxCu1-yZnyO4 probed by muon spin relaxation

{\mathrm{O}}_{2}

Ultrafast quenching of electron–boson interaction and superconducting gap in a cuprate superconductor

gas at high pressure (4 bars), we have succeeded in growing single crystals for

Magnetic-field effects on the in-plane electrical resistivity in single-crystal La2-xBaxCuO4 and La1.6-xNd0.4SrxCuO4 around x = 1/8 : Implication for the field-induced stripe order

x=0.11

Spin Gap and Hole Pairing of Sr14−xA x Cu24O41(A = Ca and La) Single Crystals Studied by the Electrical Resistivity and Thermal Conductivity

of 5 mm in diameter and 20 mm in length. Both in-plane and out-of-plane electrical resistivities of single-crystal