Nonmonotonic Pressure Dependence of the Lattice Parameter $a$ in the Quasi-one-dimensional Superconductor Pr$_2$Ba$_4$Cu$_7$O$_{15-\delta}$

Atsuko Nakayama; Haruka Taniguchi; Makoto Hagiwara; Masatoshi Murakami; Michiaki Matsukawa; Riku Takahashi; Satoshi Nakano; Takahiko Sasaki; Yuya Nakarokkaku

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Nonmonotonic Pressure Dependence of the Lattice Parameter $a$ in the Quasi-one-dimensional Superconductor Pr$_2$Ba$_4$Cu$_7$O$_{15-\delta}$

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arxiv 2012.13513 v1 pith:GTUYAAR4 submitted 2020-12-25 cond-mat.supr-con

Haruka Taniguchi , Yuya Nakarokkaku , Riku Takahashi , Masatoshi Murakami , Atsuko Nakayama , Michiaki Matsukawa , Satoshi Nakano , Makoto Hagiwara

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Takahiko Sasaki

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keywords approximatelydeltalatticeparameterpressurequasi-one-dimensionalsuperconductortwo-dimensional

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abstract

In the quasi-one-dimensional superconductor, Pr$_2$Ba$_4$Cu$_7$O$_{15-\delta}$, we found that the lattice parameter, $a$ increased against pressure, starting at 2.0 GPa at approximately 300 K. This result suggests that the two-dimensional inter-conducting-chain interaction along the $a$ axis is most enhanced at approximately 2.0 GPa. To discuss the dimensionality, we also measured the resistance under magnetic fields up to 14 T, because magneto-resistance is induced when a system changes from one-dimensional to two-dimensional.

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