Intermediate Regime between Metal and Superconductor Below Τ = 100 K in NiSi

Published

November 28, 2016

Author(s)

Ashutosh Dahal, Jagath Gunasekera, Leland Harriger, S. H. Lee, Y. S. Hor, David J. Singh, Deepak K. Singh

Abstract

Magnetic response of a metal to an external magnetic field is termed as paramagnetic or diamagnetic, depending on the parallel or antiparallel alignment of electron's moment to the applied field, respectively.^1-3 It remains independent of temperature of the freque3ncy of an ac magnetic field, as envisaged under the quantum-mechanical treatment.^1,4 Any temperature or frequency dependence of the diamagnetic susceptibility, in particular, will indicate a significant departure from the well-established theory of metal's bulk properties. Here, we report the discovery of an anomalous but enormous enhancement of the ac frequency dependent diamagnetic susceptibility below T approximately equal to} 100 K in metallic NiSi. In addition, magnetic measurements of NiSi in applied magnetic field depict strong irreversibility in the diamagnetic responses of zero field cool and field cool curves below T approximately equal} 55 K. While these observations reminisce of a superconductor,^5-8 the metallic behavior of NiSi is manifested to the lowest temperature of T = 1.5 K. We discuss whether the temperature and frequency dependent diamagnetism in NiSi arises due to the correlated spin fluctuations or its a new phenomenon, which bridges the gap between metal and superconductor. Consequently, this novel intermediate regime provides the gap between metal and superconductor. Consequently, this novel intermediate regime provides new perspective to the development of magnetic cuperconductor.

Citation

Physical Review B

Volume

94

Issue

18

Pub Type

Journals

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Keywords

Superconductivity, Magnetism, Neutron scattering

Citation

Dahal, A. , Gunasekera, J. , Harriger, L. , Lee, S. , Hor, Y. , Singh, D. and Singh, D. (2016), Intermediate Regime between Metal and Superconductor Below Τ = 100 K in NiSi, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=920728 (Accessed January 24, 2025)