Effect of magnetic impurities on the vortex lattice properties in NbSe 2 single crystals

M. Iavarone; R. Di Capua; G. Karapetrov; A. E. Koshelev; D. Rosenmann; H. Claus; C. D. Malliakas; M. G. Kanatzidis; T. Nishizaki; N. Kobayashi

doi:10.1103/PhysRevB.78.174518

Effect of magnetic impurities on the vortex lattice properties in NbSe ₂ single crystals

M. Iavarone, R. Di Capua, G. Karapetrov, A. E. Koshelev, D. Rosenmann, H. Claus, C. D. Malliakas, M. G. Kanatzidis, T. Nishizaki, N. Kobayashi

Northwestern University

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

We report a pronounced peak effect in the magnetization of Cox NbSe2 single crystals with critical temperatures Tc ranging between 7.1 and 5.0 K, and Mnx NbSe2 single crystals with critical temperatures down to 3.4 K. We correlate the peak effect in magnetization with the structure of the vortex lattice across the peak-effect region using scanning-tunneling microscopy. Magnetization measurements show that the amplitude of the peak effect in the case of Cox NbSe2 exhibits a nonmonotonic behavior as a function of the Co content, reaching a maximum for concentration of Co of about 0.4 at.% (corresponding to a Tc of 5.7 K) and after that gradually decreasing in amplitude with the increase in the Co content. The normalized value of the peak position Hp/Hc2 has weak dependence on Co concentration. In the case of Mnx NbSe2 the features of the peak effect as a function of the Mn content are different and they can be understood in terms of strong pinning.

Original language	English
Article number	174518
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	78
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.78.174518
Publication status	Published - Nov 17 2008

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Iavarone, M., Di Capua, R., Karapetrov, G., Koshelev, A. E., Rosenmann, D., Claus, H., Malliakas, C. D., Kanatzidis, M. G., Nishizaki, T., & Kobayashi, N. (2008). Effect of magnetic impurities on the vortex lattice properties in NbSe ₂ single crystals. Physical Review B - Condensed Matter and Materials Physics, 78(17), [174518]. https://doi.org/10.1103/PhysRevB.78.174518

Effect of magnetic impurities on the vortex lattice properties in NbSe ₂ single crystals. / Iavarone, M.; Di Capua, R.; Karapetrov, G.; Koshelev, A. E.; Rosenmann, D.; Claus, H.; Malliakas, C. D.; Kanatzidis, M. G.; Nishizaki, T.; Kobayashi, N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 17, 174518, 17.11.2008.

Research output: Contribution to journal › Article › peer-review

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abstract = "We report a pronounced peak effect in the magnetization of Cox NbSe2 single crystals with critical temperatures Tc ranging between 7.1 and 5.0 K, and Mnx NbSe2 single crystals with critical temperatures down to 3.4 K. We correlate the peak effect in magnetization with the structure of the vortex lattice across the peak-effect region using scanning-tunneling microscopy. Magnetization measurements show that the amplitude of the peak effect in the case of Cox NbSe2 exhibits a nonmonotonic behavior as a function of the Co content, reaching a maximum for concentration of Co of about 0.4 at.% (corresponding to a Tc of 5.7 K) and after that gradually decreasing in amplitude with the increase in the Co content. The normalized value of the peak position Hp/Hc2 has weak dependence on Co concentration. In the case of Mnx NbSe2 the features of the peak effect as a function of the Mn content are different and they can be understood in terms of strong pinning.",

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AU - Iavarone, M.

AU - Di Capua, R.

AU - Karapetrov, G.

AU - Koshelev, A. E.

AU - Rosenmann, D.

AU - Claus, H.

AU - Malliakas, C. D.

AU - Kanatzidis, M. G.

AU - Nishizaki, T.

AU - Kobayashi, N.

PY - 2008/11/17

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N2 - We report a pronounced peak effect in the magnetization of Cox NbSe2 single crystals with critical temperatures Tc ranging between 7.1 and 5.0 K, and Mnx NbSe2 single crystals with critical temperatures down to 3.4 K. We correlate the peak effect in magnetization with the structure of the vortex lattice across the peak-effect region using scanning-tunneling microscopy. Magnetization measurements show that the amplitude of the peak effect in the case of Cox NbSe2 exhibits a nonmonotonic behavior as a function of the Co content, reaching a maximum for concentration of Co of about 0.4 at.% (corresponding to a Tc of 5.7 K) and after that gradually decreasing in amplitude with the increase in the Co content. The normalized value of the peak position Hp/Hc2 has weak dependence on Co concentration. In the case of Mnx NbSe2 the features of the peak effect as a function of the Mn content are different and they can be understood in terms of strong pinning.

AB - We report a pronounced peak effect in the magnetization of Cox NbSe2 single crystals with critical temperatures Tc ranging between 7.1 and 5.0 K, and Mnx NbSe2 single crystals with critical temperatures down to 3.4 K. We correlate the peak effect in magnetization with the structure of the vortex lattice across the peak-effect region using scanning-tunneling microscopy. Magnetization measurements show that the amplitude of the peak effect in the case of Cox NbSe2 exhibits a nonmonotonic behavior as a function of the Co content, reaching a maximum for concentration of Co of about 0.4 at.% (corresponding to a Tc of 5.7 K) and after that gradually decreasing in amplitude with the increase in the Co content. The normalized value of the peak position Hp/Hc2 has weak dependence on Co concentration. In the case of Mnx NbSe2 the features of the peak effect as a function of the Mn content are different and they can be understood in terms of strong pinning.

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