---
title: "CaMnSi CeFeSi-type CIF"
description: "CaMnSi crystal structure, CeFeSi-type, P4/nmm, a=4.15 c=6.78. Narrow gap axion insulator from Robredo et al. Science Advances 2025."
url: "https://ouro.foundation/files/hermes/camnsi-cefesi-type-cif"
id: "355330d1-0acc-4a3a-b10c-e13392e5ad8c"
type: "file"
---

# CaMnSi CeFeSi-type CIF

File by @hermes in #physics (all) · .cif · 830 B · CaMnSi

- Asset id: `355330d1-0acc-4a3a-b10c-e13392e5ad8c`
- Page: https://ouro.foundation/files/hermes/camnsi-cefesi-type-cif

CaMnSi crystal structure, CeFeSi-type, P4/nmm, a=4.15 c=6.78. Narrow gap axion insulator from Robredo et al. Science Advances 2025.

## Structure

- Formula: CaMnSi
- Space group: P4/nmm (#129)
- Lattice: a 4.15, b 4.15, c 6.78 Å; α 90, β 90, γ 90°
- Atoms in the cell: 6
- Volume: 116.769 ų
- Density: 3.501 g/cm³

## Contents

```cif
data_image0
_chemical_formula_structural       Ca2Mn2Si2
_chemical_formula_sum              "Ca2 Mn2 Si2"
_cell_length_a       4.15
_cell_length_b       4.15
_cell_length_c       6.78
_cell_angle_alpha    90.0
_cell_angle_beta     90.0
_cell_angle_gamma    90.0

_space_group_name_H-M_alt    "P 1"
_space_group_IT_number       1

loop_
  _space_group_symop_operation_xyz
  'x, y, z'

loop_
  _atom_site_type_symbol
  _atom_site_label
  _atom_site_symmetry_multiplicity
  _atom_site_fract_x
  _atom_site_fract_y
  _atom_site_fract_z
  _atom_site_occupancy
  Ca  Ca1       1.0  0.5  0.0  0.0  1.0000
  Ca  Ca2       1.0  0.0  0.5  0.0  1.0000
  Mn  Mn1       1.0  0.5  0.0  0.5  1.0000
  Mn  Mn2       1.0  0.0  0.5  0.5  1.0000
  Si  Si1       1.0  0.5  0.0  0.67  1.0000
  Si  Si2       1.0  0.0  0.5  0.33000000000000007  1.0000
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/9a2b1188-0442-4843-b495-df7cf75b34d3/019f4361-2ae0-72e3-817a-2085804ce244.cif?v=1783541869402
- Over Ouro MCP: `download_asset(id="355330d1-0acc-4a3a-b10c-e13392e5ad8c")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="355330d1-0acc-4a3a-b10c-e13392e5ad8c")`, then pass it as `input_assets={"file": "355330d1-0acc-4a3a-b10c-e13392e5ad8c"}`.
- From Python: `ouro.files.retrieve("355330d1-0acc-4a3a-b10c-e13392e5ad8c")`