On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

Sirenko, V. A.; Makedonska, N.; Shabakayeva, Yu. A.; Schleser, R.

doi:10.1063/1.1496670

Low Temperature Physics

2002

DOI: 10.1063/1.1496670

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On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

V. A. Sirenko

N. Makedonska

Yu. A. Shabakayeva

et al.

Abstract: Torque measurements were performed on a high-quality single crystal of the uniaxial superconductor 2H-NbSe 2 in a tilted magnetic field 0-200 kG, in the temperature range 1.5-4.2 K. The transverse component of the absolute magnetization was derived in a magnetic field directed at an angle of 77°to the axis of anisotropy, and its field dependence was analyzed in a reversible domain of the mixed state. The penetration depth and anisotropy characteristics were obtained for the sample under study.

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“…This infers that Δ S is more isotropic and rather three-dimensional. Moreover, the anisotropy parameter Γ= H c2L,H⊥c /H c2L, H//c =15.2/4.9=3.1 is identical to the value from the torque measurements, 33 again strongly indicating the consistency of the two-gap model both in zero-and in-field data.…”

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confidence: 67%

Experimental evidence for a two-gap structure of superconductingNbSe2: A specific-heat study in external magnetic fields

et al. 2007

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To resolve the discrepancies of the superconducting order parameter in quasi-two-dimensional NbSe 2 , comprehensive specific-heat measurements have been carried out. By analyzing both the zero-field and mixed-state data with magnetic fields perpendicular ͑H Ќ c͒ to and parallel ͑H ʈ c͒ to the c axis of the crystal and using the two-gap model, we conclude that ͑1͒ more than one energy scale of the order parameter is required for superconducting NbSe 2 due to the thermodynamic consistency; ͑2͒ ⌬ L = 1.26 meV and ⌬ S = 0.73 meV are obtained; ͑3͒ N S ͑0͒ / N͑0͒ = 11% -20%; ͑4͒ the observation of the kink in ␥͑H͒ curve suggests that the two-gap scenario is more favorable than the anisotropic s-wave model to describe the gap structure of NbSe 2 ; and ͑5͒ ⌬ S is more isotropic and has a three-dimensional-like feature and is located either on the Se or the bonding Nb Fermi sheets.

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confidence: 67%

Experimental evidence for a two-gap structure of superconductingNbSe2: A specific-heat study in external magnetic fields

et al. 2007

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The paradigm of magnetic molecule in quantum matter: Slow molecular spin relaxation

Sirenko,

Bartolomé Usieto,

Bartolomé

2024

Low Temperature Physics

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The quantum nature of single-ion magnets, single-molecule magnets, and single-chain magnets has been manifested among other phenomena by magnetic hysteresis due to slow spin relaxation, competing with fast quantum tunneling at low temperatures. Slow spin relaxation, described by Arrhenius-type law with the effective barrier energies Ueff = 50 cm–1, was discovered 3 decades ago in paramagnetic Mn12-acetate complex of oxy-bridged mixed-valence manganese ions, below the blocking temperature TB = 3 K. In contrast to common magnetic materials, it is governed primarily by magnetic anisotropy, set by zero-splitting of spin states of a magnetic ion in a field of ligands, and spin-lattice coupling. The emerging studies on the border of coordination chemistry, physics of spin systems with reduced dimensionality, and nanotechnologies, were performed in search of routes for enhancement of Ueff and TB characteristics, in line with increase of operation temperature and quantum correlation time, mandatory for quantum applications. The best results with TB ∼ 80 K and Ueff ∼ 1261 cm–1, were obtained for DyIII single-ion magnet, so far. Numerous excellent research and review articles address particular activities behind this achievement. It follows, that present challenges are dictated by the rational development of novel, smart magnetic molecules, featured by butterfly cores, cyano-bridges, 2D metal-organic frameworks, and metal-free graphene nanoclusters, as well as stable free radicals, magnetized by spare electrons. These species are briefly considered here with respect to the unique experience of international collaborative activity, established by Prof. Juan Bartolomé.

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On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

Cited by 2 publications

References 28 publications

Experimental evidence for a two-gap structure of superconductingNbSe2: A specific-heat study in external magnetic fields

Experimental evidence for a two-gap structure of superconductingNbSe2: A specific-heat study in external magnetic fields

The paradigm of magnetic molecule in quantum matter: Slow molecular spin relaxation

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