| Back to the main page of this manual | Input reference of CP2K version 8.1 | 
CP2K_INPUT /
               FORCE_EVAL /
               DFT /
               KG_METHOD /
               XC| 2ND_DERIV_ANALYTICAL {Logical} | |
| Use analytical formulas or finite differences for 2nd derivatives of XC | |
| This keyword cannot be repeated and it expects precisely one logical. | |
| The lone keyword behaves as a switch to .TRUE. | |
| Default value: .TRUE. | 
| 3RD_DERIV_ANALYTICAL {Logical} | |
| Use analytical formulas or finite differences for 3rd derivatives of XC | |
| This keyword cannot be repeated and it expects precisely one logical. | |
| The lone keyword behaves as a switch to .TRUE. | |
| Default value: .TRUE. | 
| DENSITY_CUTOFF {Real} | |
| The cutoff on the density used by the xc calculation | |
| This keyword cannot be repeated and it expects precisely one real. | |
| Default value: 1.00000000E-010 | 
| DENSITY_SMOOTH_CUTOFF_RANGE {Real} | |
| Parameter for the smoothing procedure inxc calculation | |
| This keyword cannot be repeated and it expects precisely one real. | |
| Default value: 0.00000000E+000 | 
| FUNCTIONAL_ROUTINE {Keyword} | |
| Select the code for xc calculation | |
| This keyword cannot be repeated and it expects precisely one keyword. | |
| Default value: NEW | |
| List of valid keywords: 
 | 
| GRADIENT_CUTOFF {Real} | |
| The cutoff on the gradient of the density used by the xc calculation | |
| This keyword cannot be repeated and it expects precisely one real. | |
| Default value: 1.00000000E-010 | 
| TAU_CUTOFF {Real} | |
| The cutoff on tau used by the xc calculation | |
| This keyword cannot be repeated and it expects precisely one real. | |
| Default value: 1.00000000E-010 | 
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