Pressure dependence of the superconducting transition temperature of the filled skutterudite YFe${}_{4}$P${}_{12}$

Pressure dependence of the superconducting transition temperature of the filled skutterudite YFe $_{4}$ P $_{12}$

J.-G. Cheng, J.-S. Zhou, K. Matsubayashi, P. P. Kong, Y. Kubo, Y. Kawamura, C. Sekine, C. Q. Jin, J. B. Goodenough, and Y. Uwatoko

Phys. Rev. B 88, 024514 – Published 25 July 2013

Abstract

We have studied the pressure dependence of the superconducting transition temperature $T_{c}$ of the filled skutterudite YFe $_{4}$ P $_{12}$ under various quasihydrostatic pressures up to 8 GPa. DC magnetization measurements up to 1.2 GPa in a piston-cylinder cell yields a linear increase of $T_{c}$ with a positive coefficient $d T_{c}$ / $d P$ $=$ 1 K/GPa. Resistivity measurements up to 8 GPa in a cubic anvil apparatus show that $T_{c}$ increases to 9.3 K at 8 GPa, but the slope decreases gradually with increasing pressure. Besides the previously reported LaFe $_{4}$ P $_{12}$ , YFe $_{4}$ P $_{12}$ becomes the second filled skutterudite superconductor that exhibits a positive pressure coefficient $d T_{c}$ / $d P$ in a broad pressure range. The observed large $d T_{c}$ / $d P$ > 0 of YFe $_{4}$ P $_{12}$ can be rationalized by our band-structure calculations that show an enhancement of density of states at Fermi energy and the Hopfield parameter under pressure at least up to 8 GPa. On the other hand, similar calculations predict a $d T_{c}$ / $d P$ < 0 for YRu $_{4}$ P $_{12}$ .

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Received 15 June 2013

DOI:https://doi.org/10.1103/PhysRevB.88.024514

Authors & Affiliations

J.-G. Cheng^1,2,3,*, J.-S. Zhou², K. Matsubayashi¹, P. P. Kong³, Y. Kubo⁴, Y. Kawamura⁵, C. Sekine⁵, C. Q. Jin³, J. B. Goodenough², and Y. Uwatoko¹

¹Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
²Materials Science and Engineering Program/Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
³Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
⁴Department of Physics, College of Humanities and Science, Nihon University, Tokyo 156-8550, Japan
⁵Muroran Institute of Technology, 27-1 Mizumoto, Muroran-shi 050-8585, Japan

^*Corresponding author: jgcheng@iphy.ac.cn

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Vol. 88, Iss. 2 — 1 July 2013

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