Magnetic transitions and nearly reentrant superconducting properties of HoNi2B2C

M. S. Lin; J. H. Shieh; Y. B. You; W. Y. Guan; H. C. Ku; H. D. Yang; J. C. Ho

doi:10.1103/PhysRevB.52.1181

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Magnetic transitions and nearly reentrant superconducting properties of HoNi2B2C

M. S. Lin, J. H. Shieh, Y. B. You, W. Y. Guan, H. C. Ku, H. D. Yang, J. C. Ho

DOI 10.1103/PhysRevB.52.1181 · Physical Review B

T1

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Abstract

A low-temperature phase diagram H(T) of the 7.8-K superconductor HoNi2B2C (with an onset of 8.3 K) is generated through characterization of well-prepared samples by various experimental techniques including ac magnetic susceptibility, superconducting quantum interference device dc magnetic susceptibility, magnetic hysteresis, specific heat, and electrical resistivity measurements. The results yield a superconducting upper critical field Hc2(0) of 3.5 kG, a lower critical field Hc1(0) of 250 G, and a Ginzburg-Landau parameter κ of 3.5. A nearly reentrant deep minimum at 5.2 K with very small Hc2 of 400 G and Hc1 of 5 G are observed. Two distinct magnetic transitions are observed with an incommensurate magnetic ordering temperature Tm of 5.7–6 K and an antiferromagnetic Néel temperature TN of 5.2 K. The magnetic entropy Δ(Sm+SN) estimated between 2 and 10 K is 10.4 J/mol K. The effective internal field which causes the nearly reentrant behavior is 2 kG at 5.2 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.3	Pressure not reported	onset
HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.1	Pressure not reported	midpoint
HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.8	Pressure not reported	zero_resistance
HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.8	Pressure not reported	onset
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.6	Pressure not reported	unknown
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.5	Pressure not reported	unknown
ScNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.5	Pressure not reported	unknown
ThNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown