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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by cchun1999[/i] [br]So far, I have been attempting to fit the magnetoconductivity at low temperatures using the HLN equation, but I have not been able to obtain satisfactory results. In HLN fitting for topological materials, the theoretical range of A should be between -1 and 1. However, when applying the equation to my data, the obtained α values are far beyond this range, for example: A = -783.105, L = -8.5103E-9 The code I have been using is: y = (A * 1.23314709 * 10^-5) * (real_polygamma(0.5 + 1.64557041 * 10^(-16) / (x * L^2), 0) - ln(1.64557041 * 10^(-16) / (x * L^2))). The quantity I have been fitting is y = delta_sigma (unit: 1/R = siemens), with x representing the magnetic field (unit: Tesla). I would appreciate any insights or suggestions regarding potential mistakes in my approach. Thank you all. My raw datas are below： Magnet field(unit: Tesla) 9.0000734 8.5000344 8.0000727 7.500057 7.0000898 6.5000859 6.0000746 5.5000797 5.0000711 4.5000879 4.0000398 3.5000637 3.0000895 2.5000785 2.0000582 2.0000537 1.8000371 1.6000531 1.4000832 1.200041 1.0000408 0.8000755 0.599996 0.3999749 0.2000631 -0.0000023 -0.2000398 -0.4000308 -0.6000263 -0.8000266 -1.0000338 -1.2000387 -1.4000366 -1.6000228 -1.800023 -2.0000467 -2.0000676 -2.4999855 -3.0000268 -3.5000473 -4.0000281 -4.5000133 -5.000043 -5.5000332 -6.0000375 -6.5000418 -7.0000313 -7.5000313 -8.0000164 -8.5000227 -9.0000242 Delta_sigma(unit:siemens) -0.002887489 -0.002687662 -0.002485256 -0.002280469 -0.002074338 -0.001868494 -0.001663777 -0.001462566 -0.001266492 -0.001077444 -0.000897571 -0.000729016 -0.000574062 -0.000435262 -0.000315078 -0.00031482 -0.000272575 -0.000233804 -0.000198404 -0.000166774 -0.000138783 -0.000114215 -9.2728E-05 -7.3475E-05 -5.2651E-05 0 -5.43256E-05 -7.43393E-05 -9.34855E-05 -0.000114852 -0.000139313 -0.000167332 -0.000198974 -0.000234167 -0.000272964 -0.000315264 -0.000315422 -0.00043529 -0.000573994 -0.000728615 -0.000897118 -0.001076791 -0.0012658 -0.001461805 -0.001662853 -0.001867149 -0.002073067 -0.002279108 -0.002483893 -0.002686309 -0.002885671 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.