---
title: "Mathew Debessai"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Mathew Debessai"
aliases: []
first_seen: "2026-08-09T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["carbonaceous sulfur hydride","2009 europium superconductivity paper","Ranga Dias","high-pressure diamond-anvil technique","Jorge Hirsch's forensic method"]
seek_code_commit: "46c6736"
---


Physicist and co-author of both a 2009 *Physical Review Letters* paper
reporting superconductivity in europium and the 2020 carbonaceous-sulfur-hydride
paper (Snider, Dasenbrock-Gammon, Dias et al., *Nature*) — the paper *Nature*
retracted in 2022. Per Jorge Hirsch's account, Debessai performed the raw
susceptibility measurements underlying both studies and taught Ranga Dias
high-pressure measurement technique. Matters to this vault as the physical
link between Hirsch's confirmed-by-his-own-account precedent case of data
alteration (the 2009 europium paper) and the disputed 2020 CSH data: the same
hands are said to have produced both datasets.

## References
- [[claim-hirsch-modeled-csh-critique-on-2009-debessai-europium-precedent]]
- Related hubs: [[entity-jorge-e-hirsch]] · [[entity-ranga-dias]]