Role of s-d Exchange Interactions in Dilute Alloys Exhibiting Both Low-Temperature Resistance Anomalies and Superconductivity

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概要

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• Measurements of the magnetic susceptibility of some dilute Zn-Mn alloys are reported in the temperature range where this alloy system is known to exhibit low-temperature resistance anomalies. All of the alloys studied obey a Curie law with the most concentrated alloy (0.43-at. % Mn) exhibiting deviations in the neighborhood of 6°K. The Curie constant indicates that manganese when dissolved in zinc has a spin value of 3/2 which is temperature-independent between 5 and 273°K. Calculations of the exchange integral J from the magnetic properties of dilute Zn-Mn alloys have been made from the Neel temperature, the magnetoresistivity as a function of field strength and the suppression of the superconducting critical temperature based on theoretical equations which assume a scalar s-d interaction between the paramagnetic ions and conduction electrons. All of the derived values of J lie in the range of (1.4±0.2) ×10^<-12> erg which would lead one to conclude that the magnetic interaction giving rise to these various effects is of the same nature. A graphical method for separating the resistance minimum from the total resistivity, in the presence of a resistance maximum produced by magnetic ordering in the Zn-Mn system, is presented.

• 東北大学の論文

著者

• Muto Y.

  The Research Institute for Iron, Steel and Other Metals

• Collings E.

  The Franklin Institute Laboratories For Research And Development

• HEDGCOCK F.

  The Franklin Institute Laboratories for Research and Development

• Muto Y.

  The Research Institute For Iron Steel And Other Metals

関連論文

• Research and Development for Pressurized He II Cooled Superconducting Magnets(Part II. Several Instruments and Techniques Developed in HFLSM)
• Cryogenic Systems in High Field Laboratory for Superconducting Materials(Part I. Establishment and Tests of Hybrid Magnet System at HFLSM)
• Role of s-d Exchange Interactions in Dilute Alloys Exhibiting Both Low-Temperature Resistance Anomalies and Superconductivity
• Low-Temperature Magnetoresistance in Magnesium and Aluminum Containing Small Concentrations of Manganese or Iron
• On upper Critical Fields of Layered Superconductors Nb_Ta_xSe_2(Superconductivity・Intercalation)
• ANOMALOUSLY LARGE NEGATIVE MAGNETORESISTANCE OF 1T-TaS_2 AT ULTRA LOW TEMPERATURES(Phase Transition・Charge Density Wave)
• Magnetoresistances of Dilute Alloys of Manganese in Copper, Manganese in Zinc and Chromium in Zinc at Liquid Helium Temperatures

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