Low temperature specific heat of polycrystalline UGe2 at high pressure

R. Vollmer; C. Pfleiderer; H. V. Löhneysen; E. D. Bauer; M. B. Maple

doi:10.1016/S0921-4526(01)01078-X

Low temperature specific heat of polycrystalline UGe₂ at high pressure

R. Vollmer, C. Pfleiderer, H. V. Löhneysen, E. D. Bauer, M. B. Maple

Publikation: Beitrag in Fachzeitschrift › Konferenzartikel › Begutachtung

9 Zitate (Scopus)

Abstract

In UGe₂, superconductivity in coexistence with ferromagnetism is observed in single crystal (Nature 406 (2000) 587; Phys. Rev. B 63 (2001) 144519) and polycrystalline samples (J. Phys. Condens. Matter 13 (2001) L759) just below the pressure p_c ≈ 16 kbar for which the Curie temperature T_C drops to zero. We present measurements of the specific heat C in the range 0.1-2.5 K on polycrystalline samples up to 14.7 kbar. The linear coefficient of the specific heat, γ = C/T, increases as a function of pressure and is the highest in the p-range where superconductivity is observed. In the superconducting state the AC magnetic susceptibility exhibits strong diamagnetic shielding. The specific heat displays an anomaly that is indicative of a bulk superconducting transition of order 15-20% by volume. The observed properties reflect an intricate interplay of the coexistence of ferromagnetism and superconductivity in UGe₂.

Originalsprache	Englisch
Seiten (von - bis)	112-114
Seitenumfang	3
Fachzeitschrift	Physica B: Condensed Matter
Jahrgang	312-313
DOIs	https://doi.org/10.1016/S0921-4526(01)01078-X
Publikationsstatus	Veröffentlicht - März 2002
Extern publiziert	Ja
Veranstaltung	International Conference on Strongly Correlated Electrons - Ann Arbor, MI, USA/Vereinigte Staaten Dauer: 6 Aug. 2002 → 6 Aug. 2002

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10.1016/S0921-4526(01)01078-X

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title = "Low temperature specific heat of polycrystalline UGe2 at high pressure",

abstract = "In UGe2, superconductivity in coexistence with ferromagnetism is observed in single crystal (Nature 406 (2000) 587; Phys. Rev. B 63 (2001) 144519) and polycrystalline samples (J. Phys. Condens. Matter 13 (2001) L759) just below the pressure pc ≈ 16 kbar for which the Curie temperature TC drops to zero. We present measurements of the specific heat C in the range 0.1-2.5 K on polycrystalline samples up to 14.7 kbar. The linear coefficient of the specific heat, γ = C/T, increases as a function of pressure and is the highest in the p-range where superconductivity is observed. In the superconducting state the AC magnetic susceptibility exhibits strong diamagnetic shielding. The specific heat displays an anomaly that is indicative of a bulk superconducting transition of order 15-20% by volume. The observed properties reflect an intricate interplay of the coexistence of ferromagnetism and superconductivity in UGe2.",

keywords = "Ferromagnetism, Specific heat, Superconductivity, UGe",

author = "R. Vollmer and C. Pfleiderer and L{\"o}hneysen, {H. V.} and Bauer, {E. D.} and Maple, {M. B.}",

note = "Funding Information: M.B.M. acknowledges the Alexander von Humboldt Foundation for a Senior Scientist Research Award. Research in Karlsruhe was supported by the Deutsche Forschungsgemeinschaft and the Ferlin Program of the European Science Foundation. Research at UCSD was supported by the US Department of Energy.; International Conference on Strongly Correlated Electrons ; Conference date: 06-08-2002 Through 06-08-2002",

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AU - Vollmer, R.

AU - Pfleiderer, C.

AU - Löhneysen, H. V.

AU - Bauer, E. D.

AU - Maple, M. B.

N1 - Funding Information: M.B.M. acknowledges the Alexander von Humboldt Foundation for a Senior Scientist Research Award. Research in Karlsruhe was supported by the Deutsche Forschungsgemeinschaft and the Ferlin Program of the European Science Foundation. Research at UCSD was supported by the US Department of Energy.

PY - 2002/3

Y1 - 2002/3

N2 - In UGe2, superconductivity in coexistence with ferromagnetism is observed in single crystal (Nature 406 (2000) 587; Phys. Rev. B 63 (2001) 144519) and polycrystalline samples (J. Phys. Condens. Matter 13 (2001) L759) just below the pressure pc ≈ 16 kbar for which the Curie temperature TC drops to zero. We present measurements of the specific heat C in the range 0.1-2.5 K on polycrystalline samples up to 14.7 kbar. The linear coefficient of the specific heat, γ = C/T, increases as a function of pressure and is the highest in the p-range where superconductivity is observed. In the superconducting state the AC magnetic susceptibility exhibits strong diamagnetic shielding. The specific heat displays an anomaly that is indicative of a bulk superconducting transition of order 15-20% by volume. The observed properties reflect an intricate interplay of the coexistence of ferromagnetism and superconductivity in UGe2.

AB - In UGe2, superconductivity in coexistence with ferromagnetism is observed in single crystal (Nature 406 (2000) 587; Phys. Rev. B 63 (2001) 144519) and polycrystalline samples (J. Phys. Condens. Matter 13 (2001) L759) just below the pressure pc ≈ 16 kbar for which the Curie temperature TC drops to zero. We present measurements of the specific heat C in the range 0.1-2.5 K on polycrystalline samples up to 14.7 kbar. The linear coefficient of the specific heat, γ = C/T, increases as a function of pressure and is the highest in the p-range where superconductivity is observed. In the superconducting state the AC magnetic susceptibility exhibits strong diamagnetic shielding. The specific heat displays an anomaly that is indicative of a bulk superconducting transition of order 15-20% by volume. The observed properties reflect an intricate interplay of the coexistence of ferromagnetism and superconductivity in UGe2.

KW - Ferromagnetism

KW - Specific heat

KW - Superconductivity

KW - UGe

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T2 - International Conference on Strongly Correlated Electrons

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