Afzali, R. (2006) *Quantum fluctuation and tunneling of a superconducting nano-grain.* Physica Status Solidi C - Current Topics in Solid State Physics, 3 (9). pp. 3130-3134. ISSN 1610-1634

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Official URL: http://www3.interscience.wiley.com/journal/1127296...

## Abstract

Quantum fluctuation and tunneling of a superconducting nano-grain placed in magnetic field are analytically considered in frequency space. Tunneling fluctuation of a superconducting grain to superposition of superconducting and paramagnetic states are investigated. By using Fourier transformation, instanton equations are solved. Then, by supposing smallness of deviation of order parameter with respect to BCS energy gap, matrix Green function of system and self-consistent equation of order parameter in frequency space, at first approximation, for both d -wave and s -wave case, is obtained. Based on analytic form of order parameter of system at Fermi sphere, quantum phase transition of a s-wave superconducting grain is shown. For d-wave case, investigating of tunneling process at first approximation is subtle and needs further attention. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Item Type: | Article |
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Subjects: | Physical Science > Nanophysics Physical Science > Nano objects Material Science > Nanochemistry Material Science > Nanostructured materials |

Divisions: | Faculty of Engineering, Science and Mathematics > School of Physics Faculty of Engineering, Science and Mathematics > School of Chemistry |

ID Code: | 7323 |

Deposited By: | JNCASR |

Deposited On: | 28 Oct 2009 09:40 |

Last Modified: | 28 Oct 2009 09:40 |

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