Effect of pressure on the superconductivity and magnetism of Ho1−xDyxNi2B2C

Jae-Hyuk Choi; Hyeonjin Doh; Eun-Mi Choi; Sung-Ik Lee; M. Ohashi; N. Môri

doi:10.1103/PhysRevB.65.024520

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Effect of pressure on the superconductivity and magnetism of Ho1−xDyxNi2B2C

Jae-Hyuk Choi, Hyeonjin Doh, Eun-Mi Choi, Sung-Ik Lee, M. Ohashi, N. Môri

DOI 10.1103/PhysRevB.65.024520 · Physical Review B

T1

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Abstract

We have studied the pressure effect on the superconductivity and magnetism of Ho1−xDyxNi2B2C for x=0.1 and x=0.4 by measuring its transport properties. While the superconducting transition temperature Tc lies above the Néel temperature TN for x=0.1, the Tc lies below the TN for x=0.4. The pressure changes the magnetic exchange integral Jsf and controls the pair breaking effect. In the case of the x=0.1 sample, increasing pressure decreases Tc, which can be explained by the pressure-induced change of the magnetic exchange integral Jsf within Abrikosov-Gor’kov theory. On the other hand, the pressure does not influence the Tc of the x=0.4 sample. Also, we measured the pressure dependence of the upper critical field. These results support the phenomenological theory of multiband superconductivity in an antiferromagnetic state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ho0.9Dy0.1Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.2	0.1 GPa	unknown
Ho0.6Dy0.4Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	0.1 GPa	zero_resistance