The magnetic behaviour of an anisotropic metal cylinder

Fraser, A. R.; Shoenberg, D.

doi:10.1017/s030500410002538x

Cited by 12 publications

(3 citation statements)

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“…(20), and leads to (cf. (17))-(lg)), and from (loa), while from ( 22) and (23a), dY"/dp(= -dyz/dp) = B1 + B,{f-'") + B 3 { @ m ( f ) } , (26) (274…”

Section: The Mutual Inductance Bridgementioning

confidence: 94%

“…After the pressure measurements were complete, both the sample (at a constant pressure of x 1 bar) and the empty coil were measured at x 1 8 frequencies in order to obtain the fit coefficients from (24) needed in the analysis of the pressure derivatives (26).…”

Section: Methodsmentioning

confidence: 99%

“…The analysis of the pressure data has therefore been in two stages. Firstly, a fit with the first two terms of (26), which gives the values of B , and B , . Secondly, a fit of the same data using the second and third terms of ( 26), and with B , constrained to be compatible with the average value for the bulk modulus over all the samples, since there is no evidence that there is any significant difference between them; these refitted values of B, give a more consistent set of coefficients than the first ones, and lead to the more reliable values of n calculated from eq.…”

Section: Pressure Data; Bulk Modulus Btmentioning

confidence: 99%

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The use of eddy currents for measurements of bulk modulus: Application to potassium

Gugan¹

1997

Phys. Scr.

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The eddy current technique for the study of the resistivity of cylindrical conductors has been adapted for high precision measurements at the level of a few ppm. By using a mutual inductance bridge at frequencies where the skin depth is less than about one fifth of the radius of the sample, the asymptotic expansions for the complex susceptibility as a function of frequency may be used to obtain both the resistivity and the area of cross-section for samples measured under contactless conditions, and more important here, also their variation with pressure.Several normal metals and superconductors have been measured at liquid helium temperatures and at pressures of up to 150 bar in order to assess the reliability of the technique. A detailed discussion of these tests is given, and they suggest that it should be practicable to measure the initial bulk modulus of even stiff metals to an accuracy of 0.1% over the temperature range 4-300 K.The method has been applied to potassium, and to dilute K Rb alloys. The mean value of the initial bulk modulus of potassium at 4.2 K is BT (4.2 K) = 37.83 ± 0.07 kbar, which is consistent with ultrasonic and bulk compression measurements, but with a ten-fold reduction in the uncertainty: however, this value is inconsistent with the value inferred from measurements of the de Haas-van Alphen effect, at a level of more than five times their combined standard error estimates.

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“…(20), and leads to (cf. (17))-(lg)), and from (loa), while from ( 22) and (23a), dY"/dp(= -dyz/dp) = B1 + B,{f-'") + B 3 { @ m ( f ) } , (26) (274…”

Section: The Mutual Inductance Bridgementioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Pressure Data; Bulk Modulus Btmentioning

confidence: 99%

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