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Diverse fluctuations and anisotropic Grüneisen parameter behavior
in iron-based superconductor Ba(Fe_1-xCo_x)_2As_2 and their
correlation with superconductivity
release_y6ntevk4dbgdditxuiev2v3mba
by
Chiaki Fujii,
Shalamujiang Simayi,
Kouhei Sakano,
Chizuru Sasaki,
Mitsuteru Nakamura,
Yoshiki Nakanishi,
Kunihiro Kihou,
Masamichi Nakajima,
Chul-Ho Lee,
Akira Iyo,
Hiroshi Eisaki,
Shin-ichi Uchida,
Masahito
Yoshizawa
Released
as a article
.
2018
Abstract
In this study, the temperature dependence of elastic constants C_11,
C_33, C_ E = (C_11-C_12)/2, C_66 and C_44 of the
iron-based superconductor Ba(Fe_1-xCo_x)_2As_2 (0 ≦ x
≦ 0.245) have been measured. This system shows a large elastic softening
in C_66 towards low temperatures. In addition to C_66, which originates
from orthorhombic structural fluctuation, the samples near the optimal
concentration show remarkable structural fluctuation in C_11 and C_33
elastic modes, which correspond to Γ_1 (C4) symmetry. It suggests the
existence of diverse fluctuations in this system. Grüneisen parameters
were analyzed under some assumptions for structural and magnetic transition
temperatures. Results showed that the Grüneisen parameters for the
inter-plane strain are remarkably enhanced toward the QCP, while those for the
in-plane stress tend to turn down near the QCP. Grüneisen parameters for
the superconducting transition are anisotropic and shows remarkable
Co-concentration dependence, suggesting that the in-plane isotropic compression
and inter-layer elongation enhance the superconductivity. The correlation of
Grüneisen parameters between T_ S, T_ N and T_ sc
shows c-axis elongation and its relevant role in the emergence of
superconductivity in this system.
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1801.02791v1
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