{
  "abstract": "CeRh$_2$As$_2$ has been receiving considerable attention due to its unusual two-phase superconductivity. The superconducting (SC) phase appears at $T_{\\mathrm{c}}$ = 0.35 K in an ordered state (phase I) of the Ce-4$f$ moments, which develops below $T_{\\mathrm{0}}$ = 0.55 K. The microscopic nature of phase I has not been fully established yet. We report a single-crystal study of the effect of La substitution on these low-temperature phases in Ce$_{1-\\textit{x}}$La$_\\textit{x}$Rh$_2$As$_2$ up to $x$ = 0.1. The lattice parameters increase monotonically with $x$, corresponding to an effective negative pressure of approximately -0.3 GPa for $x$ = 0.1. While the Ce$^{3+}$ local valence state and the non-Fermi-liquid behavior are preserved, the resistivity coherence maximum $T^{*}_{\\mathrm{max}}$ $\\approx$ 45 K in the pristine sample shifts to lower temperatures with increasing $x$, indicating a suppression of the Kondo energy scale upon lattice expansion. On the other hand, both $T_{\\mathrm{c}}$ and $T_{\\mathrm{0}}$ are rapidly suppressed to below 0.1 K for $x$ $>$ 0.05. Notably, such a rapid decrease of $T_{\\mathrm{c}}$ under moderate negative pressure is unexpected, but is rather consistent with substitution-induced disorder effect which leads to strong pair breaking in unconventional superconductors. The observed fragility of phase I under both pressure and disorder may imply its itinerant origin.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. B 114, 115129 (2026)",
  "arxiv": "2609.17080",
  "author_total": 4,
  "authors": [
    {
      "name": "Sushma Lakshmi Ravi Sankar"
    },
    {
      "name": "Manuel Brando"
    },
    {
      "name": "Jochen Wosnitza"
    },
    {
      "name": "Seunghyun Khim"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/95hxfbsrskh3g.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.17080",
  "fulltext_url": null,
  "id": "95hxfbsrskh3g",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.17080",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.17080",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/95hxfbsrskh3g.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2609.17080",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.17080"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "La substitution studies on the heavy-fermion superconductor CeRh$_2$As$_2$",
  "title_text": "La substitution studies on the heavy-fermion superconductor CeRh_2As_2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:41Z",
  "url": "https://research.draconitic.com/paper/95hxfbsrskh3g",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/f79y-ssdx",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}