Materials catalogue Additional source observations

Source reference pilot

Seven CrB₂ paper items and three independent crystallographic references, with conditions and original file hashes. Sample and state matching remains pending; current publication status has not been checked.

Prepared 2026-10-02Download reference metadata (JSON)Download SHA-256

CrB₂ · paper findings

Pressure-induced superconductivity in itinerant antiferromagnet CrB2. Source-specific reports and derived quantities are kept separate below.

Rounded summary Tc
Experimental report · rounded summary
7 K at approximately 100 GPa
Summary on PDF page 3. Kept separate from the detailed transport result.
PDF page 3
Scope and association
Catalogue result and sample matching pending.
Detailed transport Tc
Experimental transport report
Approximately 7.3 K at 110.4 GPa
Transport result on PDF page 4.
PDF page 4
Scope and association
Catalogue result, sample and curve matching pending.
High-pressure measurement method
Experimental method description
DC resistivity · van der Pauw · DAC / PPMS
Reported above 12 GPa; ruby pressure calibration at room temperature.
PDF page 3
Scope and association
Below 12 GPa, the source describes a separate CAC four-probe protocol.
Transition criterion
Figure-specific definition
90% of normal-state resistivity
Figure 2 caption on PDF page 8; associated upper-critical-field curve context on page 5.
PDF page 8
Scope and association
Applicability to individual catalogue results remains unresolved.
Upper critical field, μ₀Hc2(0)
Derived from a GL fit to transport
5.81 T at 110.4 GPa
Zero-temperature extrapolation on PDF page 5. Figure 2d rounds the same fit to 5.8 T.
PDF page 5 Related: Transition criterion Related: High-pressure measurement method
Scope and association
This is a fitted quantity; result and sample matching pending.
Coherence length, ξ_GL(0)
Derived from fitted Hc2(0)
7.54 nm at 110.4 GPa
Reported on PDF page 5; depends on the fitted upper critical field.
PDF page 5 Related: Upper critical field, μ₀Hc2(0)
Scope and association
Result and sample matching pending.
Reported structure description
Source structure description
AlB₂ type · P6/mmm
Ambient-pressure description; separate room-temperature XRD discussion extends to 97.2 GPa.
PDF page 3 PDF page 5
Scope and association
Coordinates at 110.4 GPa and association with the COD reference remain unestablished.

Independent crystallographic references

Conditions below belong to each CIF. They do not supply the pressure or temperature of a superconducting transition, or establish that a catalogue result used this structure.

MgB₂ and FeSe were in the disputed or archive catalogue partition in the checked historical snapshot. These independent COD references do not establish catalogue associations or release held records.

CrB2

COD 1510641 · source year 1954

Declared space group: P 6/m m m · 191
Structure conditions: Temperature not supplied · Pressure not supplied
Lattice lengths (Å): a = 2.97 · b = 2.97 · c = 3.07
Lattice angles (degrees): α = 90 · β = 90 · γ = 120

COD entry CIF revision download Source publication

File provenance and inspection

Captured 2026-10-01T20:39:12.139572+00:00 · header revision 176435 · 2,071 bytes.

SHA-256: bdd1e9169c057b3b0b2e5b16c96d7cde1427c04aaf3668f858ca8b06fc9e67ec

AI-assisted checks parsed the CIF and inspected listed sites, declared symmetry operations and lattice metrics. Independent space-group inference, checkCIF and refinement were not performed.

Physical sample, phase and catalogue result matching remain pending.
Pressure is not supplied in this CIF.
Temperature is not supplied in this CIF.

Moskowitz, D.; Glaser, F.W.; Post, B.. Transition metal diborides. Acta Metallurgica (1954). COD data: CC0-1.0.

MgB2

COD 1526507 · source year 2001

Declared space group: P 6/m m m · 191
Structure conditions: Temperature not supplied · Pressure not supplied
Lattice lengths (Å): a = 3.0823 · b = 3.0823 · c = 3.51461
Lattice angles (degrees): α = 90 · β = 90 · γ = 120

COD entry CIF revision download

File provenance and inspection

Captured 2026-10-01T20:39:12.139577+00:00 · header revision 176429 · 2,105 bytes.

SHA-256: 0eb4eaf6098974db2698bf97a0cd443ffff9a2fc3f6ba8ca31afbebd06c5363d

AI-assisted checks parsed the CIF and inspected listed sites, declared symmetry operations and lattice metrics. Independent space-group inference, checkCIF and refinement were not performed.

Physical sample, phase and catalogue result matching remain pending.
Pressure is not supplied in this CIF.
Temperature is not supplied in this CIF.

Jorgensen, J.D.; Hinks, D.G.; Short, S.. Lattice properties of Mg B2 versus temperature and pressure. Physical Review, Serie 3. B - Condensed Matter (18,1978-) (2001). COD data: CC0-1.0.

FeSe

COD 4002152 · source year 2015

Declared space group: P 4/n m m :1 · 129
Structure conditions: 295 K · Pressure not supplied
Lattice lengths (Å): a = 3.77354(5) · b = 3.77354(5) · c = 5.52226(12)
Lattice angles (degrees): α = 90 · β = 90 · γ = 90
Refined Fe occupancy: 0.996(3) · standard uncertainty 0.003. This alone does not establish a physical vacancy concentration.

COD entry Current CIF download Source publication

File provenance and inspection

Captured 2026-10-01T20:40:49.448229+00:00 · header revision 176432 · 1,555,426 bytes.

SHA-256: 83a6bd28f07e9acca04035b5eb29c0bfa18a2a1133eb196ca2d029a029787ad5

AI-assisted checks parsed the CIF and inspected listed sites, declared symmetry operations and lattice metrics. Independent space-group inference, checkCIF and refinement were not performed.

Physical sample, phase and catalogue result matching remain pending.
Pressure is not supplied in this CIF.
The fixed revision URL was unavailable at capture. The downloaded current URL contained revision 176432; future downloads may differ.
Refined Fe occupancy is 0.996(3), with standard uncertainty 0.003; this alone does not establish a physical vacancy concentration.

Greenfield, Joshua T.; Kamali, Saeed; Lee, Kathleen; Kovnir, Kirill. A Solution for Solution-Produced β-FeSe: Elucidating and Overcoming Factors that Prevent Superconductivity. Chemistry of Materials (2015). COD data: CC0-1.0.

Inspection scope and use

These source items are independent of selected catalogue properties. Associations remain pending; no scientific approval, canonical promotion or training permission is granted by this pilot. The current publication status and source lifecycle of each work have not been established here.

The checked historical catalogue snapshot (761bbc9, v2026.09.03) placed MgB₂ and FeSe in disputed or archive scope. Their independent COD metadata here does not create a catalogue entry, restore a held record or establish a sample association. Current eligibility must be checked separately.

The PDF was requested as v1; publication revision remains unverified. Captured PDF SHA-256: 036b3c1cb653ee142f202a5b68c54230753621aaf31dfcfd60ea1f4447f1ea03. Page anchors in the JSON use characters in the captured text extraction, rather than PDF geometry.

The JSON provides factual metadata and original-source links. Original PDF and CIF files are available from their providers. A current download URL may return different bytes; compare it with the recorded hash.

CrB₂ · paper findings

Rounded summary Tc

Experimental report · rounded summary

7 K at approximately 100 GPa

Summary on PDF page 3. Kept separate from the detailed transport result.

PDF page 3

Scope and association

Catalogue result and sample matching pending.

Detailed transport Tc

Experimental transport report

Approximately 7.3 K at 110.4 GPa

Transport result on PDF page 4.

PDF page 4

Scope and association

Catalogue result, sample and curve matching pending.

High-pressure measurement method

Experimental method description

DC resistivity · van der Pauw · DAC / PPMS

Reported above 12 GPa; ruby pressure calibration at room temperature.

PDF page 3

Scope and association

Below 12 GPa, the source describes a separate CAC four-probe protocol.

Transition criterion

Figure-specific definition

90% of normal-state resistivity

Figure 2 caption on PDF page 8; associated upper-critical-field curve context on page 5.

PDF page 8

Scope and association

Applicability to individual catalogue results remains unresolved.

Upper critical field, μ₀Hc2(0)

Derived from a GL fit to transport

5.81 T at 110.4 GPa

Zero-temperature extrapolation on PDF page 5. Figure 2d rounds the same fit to 5.8 T.

Scope and association

This is a fitted quantity; result and sample matching pending.

Coherence length, ξ_GL(0)

Derived from fitted Hc2(0)

7.54 nm at 110.4 GPa

Reported on PDF page 5; depends on the fitted upper critical field.

Scope and association

Result and sample matching pending.

Reported structure description

Source structure description

AlB₂ type · P6/mmm

Ambient-pressure description; separate room-temperature XRD discussion extends to 97.2 GPa.

PDF page 3 PDF page 5

Scope and association

Coordinates at 110.4 GPa and association with the COD reference remain unestablished.

Independent crystallographic references

Conditions below belong to each CIF. They do not supply the pressure or temperature of a superconducting transition, or establish that a catalogue result used this structure.

CrB2

COD 1510641 · source year 1954

Declared space group: P 6/m m m · 191
Structure conditions: Temperature not supplied · Pressure not supplied
Lattice lengths (Å): a = 2.97 · b = 2.97 · c = 3.07
Lattice angles (degrees): α = 90 · β = 90 · γ = 120

COD entry CIF revision download Source publication

File provenance and inspection

Captured 2026-10-01T20:39:12.139572+00:00 · header revision 176435 · 2,071 bytes.

SHA-256: bdd1e9169c057b3b0b2e5b16c96d7cde1427c04aaf3668f858ca8b06fc9e67ec

AI-assisted checks parsed the CIF and inspected listed sites, declared symmetry operations and lattice metrics. Independent space-group inference, checkCIF and refinement were not performed.

Physical sample, phase and catalogue result matching remain pending.
Pressure is not supplied in this CIF.
Temperature is not supplied in this CIF.

Moskowitz, D.; Glaser, F.W.; Post, B.. Transition metal diborides. Acta Metallurgica (1954). COD data: CC0-1.0.

MgB2

COD 1526507 · source year 2001

Declared space group: P 6/m m m · 191
Structure conditions: Temperature not supplied · Pressure not supplied
Lattice lengths (Å): a = 3.0823 · b = 3.0823 · c = 3.51461
Lattice angles (degrees): α = 90 · β = 90 · γ = 120

COD entry CIF revision download

File provenance and inspection

Captured 2026-10-01T20:39:12.139577+00:00 · header revision 176429 · 2,105 bytes.

SHA-256: 0eb4eaf6098974db2698bf97a0cd443ffff9a2fc3f6ba8ca31afbebd06c5363d

AI-assisted checks parsed the CIF and inspected listed sites, declared symmetry operations and lattice metrics. Independent space-group inference, checkCIF and refinement were not performed.

Physical sample, phase and catalogue result matching remain pending.
Pressure is not supplied in this CIF.
Temperature is not supplied in this CIF.

Jorgensen, J.D.; Hinks, D.G.; Short, S.. Lattice properties of Mg B2 versus temperature and pressure. Physical Review, Serie 3. B - Condensed Matter (18,1978-) (2001). COD data: CC0-1.0.

FeSe

COD 4002152 · source year 2015

Declared space group: P 4/n m m :1 · 129
Structure conditions: 295 K · Pressure not supplied
Lattice lengths (Å): a = 3.77354(5) · b = 3.77354(5) · c = 5.52226(12)
Lattice angles (degrees): α = 90 · β = 90 · γ = 90
Refined Fe occupancy: 0.996(3) · standard uncertainty 0.003. This alone does not establish a physical vacancy concentration.

COD entry Current CIF download Source publication

File provenance and inspection

Captured 2026-10-01T20:40:49.448229+00:00 · header revision 176432 · 1,555,426 bytes.

SHA-256: 83a6bd28f07e9acca04035b5eb29c0bfa18a2a1133eb196ca2d029a029787ad5

AI-assisted checks parsed the CIF and inspected listed sites, declared symmetry operations and lattice metrics. Independent space-group inference, checkCIF and refinement were not performed.

Physical sample, phase and catalogue result matching remain pending.
Pressure is not supplied in this CIF.
The fixed revision URL was unavailable at capture. The downloaded current URL contained revision 176432; future downloads may differ.
Refined Fe occupancy is 0.996(3), with standard uncertainty 0.003; this alone does not establish a physical vacancy concentration.