Non-conventional superconductivity in magnetic In and Sn nanoparticles

AbstractWe report on experimental evidence of non-conversional pairing in In and Sn nanoparticle assemblies. Spontaneous magnetizations are observed, through extremely weak-field magnetization and neutron-diffraction measurements, to develop when the nanoparticles enter the superconducting state. The superconducting transition temperature TC shifts to a noticeably higher temperature when an external magnetic field or magnetic Ni nanoparticles are introduced into the vicinity of the superconducting In or Sn nanoparticles. There is a critical magnetic field and a critical Ni composition that must be reached before the magnetic environment will suppress the superconductivity. The observations may be understood when assuming development of spin-parallel superconducting pairs on the surfaces and spin-antiparallel superconducting pairs in the core of the nanoparticles.

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Non-S-Wave Pairing Symmetries in Superconducting in and Sn Nanoparticles

10.21203/rs.3.rs-735305/v1 ◽

2021 ◽

Author(s):

Ma-Hsuan Ma ◽

Erdembayalag Batsaikhan ◽

Huang-Nan Chen ◽

Ting-Yang Chen ◽

Chi-Hung Lee ◽

...

Keyword(s):

Magnetic Field ◽

Weak Field ◽

Critical Magnetic Field ◽

Superconducting Transition ◽

S Wave ◽

The Core ◽

Wave Pairing ◽

Pairing Symmetries ◽

Higher Temperature ◽

Sn Nanoparticle

Abstract We report on experimental evidence of non-s-wave pairing in In and Sn nanoparticle assemblies. Spontaneous magnetizations are observed, through extremely weak-field magnetization and neutron-diffraction measurements, to develop when the nanoparticles enter the superconducting state. The superconducting transition temperature TC shifts to a noticeably higher temperature when an external magnetic field or magnetic Ni nanoparticles are introduced into the vicinity of the superconducting In or Sn nanoparticles. There is a critical magnetic field and a critical Ni composition that must be reached before the magnetic environment will suppress the superconductivity. Development of spin-parallel superconducting pairs on the surfaces and spin-antiparallel superconducting pairs in the core of the nanoparticles is used to understand the observations.

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Superconducting transition temperature enhancement in YBa2Cu3O7by chemical substitution and the implications thereof for the upper critical magnetic field

Applied Physics Letters ◽

10.1063/1.108395 ◽

1992 ◽

Vol 61 (15) ◽

pp. 1852-1854 ◽

Cited By ~ 18

Author(s):

J. J. Neumeier

Keyword(s):

Magnetic Field ◽

Transition Temperature ◽

Superconducting Transition Temperature ◽

Critical Magnetic Field ◽

Superconducting Transition ◽

Chemical Substitution ◽

Upper Critical Magnetic Field ◽

Temperature Enhancement

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CRITICAL MAGNETIC FIELD IN CeCoIn5 SUPERCONDUCTOR

International Journal of Modern Physics B ◽

10.1142/s0217979205032024 ◽

2005 ◽

Vol 19 (20) ◽

pp. 3243-3248

Author(s):

JE HUAN KOO ◽

DOH-HYUN GILL ◽

GUANGSUP CHO

Keyword(s):

Magnetic Field ◽

Experimental Data ◽

Transition Temperature ◽

External Magnetic Field ◽

Temperature Gradient ◽

Critical Magnetic Field ◽

Spin Fluctuations ◽

Superconducting Transition ◽

Good Correspondence ◽

The Magnetic Field

We investigate the superconducting transition temperature, Tc in the presence of the magnetic field, H in CeCoIn 5. It is shown that phonon-enhanced spin fluctuations drive this superconductivity once more as suggested by us (Phys. Rev.B61, 4289). We know the magnetic dependence of our transition temperature is in good correspondence with experimental data. It is elucidated that the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) superconducting states are closely related to the temperature gradient contributed by the external magnetic field.

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CRITICAL FIELD AND MAGNETORESISTANCE OF SINGLE CRYSTAL TmNi2B2C

International Journal of Modern Physics B ◽

10.1142/s021797929900374x ◽

1999 ◽

Vol 13 (29n31) ◽

pp. 3715-3717 ◽

Cited By ~ 7

Author(s):

D. G. NAUGLE ◽

K. D. D. RATHNAYAKA ◽

K. CLARK ◽

P. C. CANFIELD

Keyword(s):

Magnetic Field ◽

Transition Temperature ◽

Single Crystal ◽

Critical Field ◽

Superconducting Transition Temperature ◽

Magnetic Transition ◽

Upper Critical Field ◽

Superconducting Transition ◽

Large Anisotropy ◽

The Magnetic Field

In-plane resistance as a function of magnitude and direction of the magnetic field and the temperature has been measured for TmNi2B2C from above the superconducting transition temperature at 10.7 K to below the magnetic transition TN=1.5 K. The superconducting upper critical field HC2(T) exhibits a large anisotropy and structure in the vicinity of TN. The magnetoresistance above TC is large and changes sign as the direction of the magnetic field is rotated from in-plane to parallel with the c-axis.

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