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PreprintCC BY 4.0arXiv

Experimental Evidence for Type-I Superconductivity in OsB2

  • Yogesh Singh
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Abstract

Since the discovery of superconductivity in MgB2, metal diborides have attracted significant attention. Among these, osmium diboride (OsB2), crystallizing in an orthorhombic structure (space group Pmmn) with puckered boron layers, has been classified as a low-κ Type-II superconductor (Tc ≈ 2.1 K). Here, we report experimental evidence establishing that OsB2 is in fact a rare nonelemental Type-I superconductor. Our identification is supported by three primary experimental hallmarks: (i) a pronounced Differential Paramagnetic Effect (DPE) peak in AC susceptibility (χac) measurements under static DC magnetic fields, signaling the intermediate state; (ii) a field-induced crossover to a divergent first-order phase transition in specific heat (C/T); and (iii) pronounced magnetic hysteresis in field-ramped transitions indicative of supercooling.

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Cite

BibTeXRIS
BibTeX
@misc{singh2026experimental,
  title = {{Experimental Evidence for Type-I Superconductivity in $\mathrmOsB_2$}},
  author = {Yogesh Singh},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.08239},
  eprint = {2611.08239},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.08239},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Experimental Evidence for Type-I Superconductivity in OsB_2
AU  - Yogesh Singh
PY  - 2026
DA  - 2026/11/05
PB  - arXiv
DO  - 10.48550/arxiv.2611.08239
UR  - https://arxiv.org/abs/2611.08239
AB  - Since the discovery of superconductivity in MgB_2, metal diborides have attracted significant attention. Among these, osmium diboride (OsB_2), crystallizing in an orthorhombic structure (space group Pmmn) with puckered boron layers, has been classified as a low-κ Type-II superconductor (T_c ≈ 2.1 K). Here, we report experimental evidence establishing that OsB_2 is in fact a rare nonelemental Type-I superconductor. Our identification is supported by three primary experimental hallmarks: (i) a pronounced Differential Paramagnetic Effect (DPE) peak in AC susceptibility (χ_ac) measurements under static DC magnetic fields, signaling the intermediate state; (ii) a field-induced crossover to a divergent first-order phase transition in specific heat (C/T); and (iii) pronounced magnetic hysteresis in field-ramped transitions indicative of supercooling.
ER  -