Physical properties and electronic structure of the two-gap superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi mathvariant="normal">V</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi>Ga</mml:mi> <mml:mn>5</mml:mn> </mml:msub> </mml:mrow> </mml:math>
Bibliographic record
Abstract
We present a thorough investigation of the physical properties and superconductivity of the binary intermetallic <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mrow> <a:msub> <a:mi mathvariant="normal">V</a:mi> <a:mn>2</a:mn> </a:msub> <a:msub> <a:mi>Ga</a:mi> <a:mn>5</a:mn> </a:msub> </a:mrow> </a:math> . Electrical resistivity and specific heat measurements show that <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mrow> <c:msub> <c:mi mathvariant="normal">V</c:mi> <c:mn>2</c:mn> </c:msub> <c:msub> <c:mi>Ga</c:mi> <c:mn>5</c:mn> </c:msub> </c:mrow> </c:math> enters its superconducting state below <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"> <e:mrow> <e:msub> <e:mi>T</e:mi> <e:mrow> <e:mi>s</e:mi> <e:mi>c</e:mi> </e:mrow> </e:msub> <e:mo>=</e:mo> </e:mrow> </e:math> 3.5 K, with a critical field of <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"> <f:mrow> <f:msub> <f:mi>H</f:mi> <f:mrow> <f:mrow> <f:mi mathvariant="normal">c</f:mi> <f:mn>2</f:mn> </f:mrow> <f:mo>,</f:mo> <f:mo>⊥</f:mo> <f:mi mathvariant="normal">c</f:mi> </f:mrow> </f:msub> <f:mrow> <f:mo>(</f:mo> <f:msub> <f:mi>H</f:mi> <f:mrow> <f:mrow> <f:mi mathvariant="normal">c</f:mi> <f:mn>2</f:mn> </f:mrow> <f:mo>,</f:mo> <f:mo>|</f:mo> <f:mo>|</f:mo> <f:mi mathvariant="normal">c</f:mi> </f:mrow> </f:msub> <f:mo>)</f:mo> </f:mrow> <f:mo>=</f:mo> <f:mn>6.5</f:mn> <f:mrow> <f:mo>(</f:mo> <f:mn>4.1</f:mn> <f:mo>)</f:mo> </f:mrow> </f:mrow> </f:math> kOe. With <k:math xmlns:k="http://www.w3.org/1998/Math/MathML"> <k:mrow> <k:mi>H</k:mi> <k:mo>⊥</k:mo> <k:mi>c</k:mi> </k:mrow> </k:math> , the peak effect was observed in resistivity measurements, indicating the ultrahigh quality of the single crystal studied. The resistivity measurements under high pressure reveal that the <l:math xmlns:l="http://www.w3.org/1998/Math/MathML"> <l:msub> <l:mi>T</l:mi> <l:mrow> <l:mi>s</l:mi> <l:mi>c</l:mi> </l:mrow> </l:msub> </l:math> is suppressed linearly with pressure and reaches absolute zero around 20 GPa. Specific heat and muon spin relaxation measurements indicate that the two-gap <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"> <m:mi>s</m:mi> </m:math> -wave model best describes the superconductivity of <n:math xmlns:n="http://www.w3.org/1998/Math/MathML"> <n:mrow> <n:msub> <n:mi mathvariant="normal">V</n:mi> <n:mn>2</n:mn> </n:msub> <n:msub> <n:mi>Ga</n:mi> <n:mn>5</n:mn> </n:msub> </n:mrow> </n:math> . The bands near the Fermi level around the <p:math xmlns:p="http://www.w3.org/1998/Math/MathML"> <p:mi>Z</p:mi> </p:math> and <q:math xmlns:q="http://www.w3.org/1998/Math/MathML"> <q:mi mathvariant="normal">Γ</q:mi> </q:math> points are observed and analyzed by the angle-resolved photoemission spectroscopy measurements and first-principles band structure calculations. We therefore conclude that <s:math xmlns:s="http://www.w3.org/1998/Math/MathML"> <s:mrow> <s:msub> <s:mi mathvariant="normal">V</s:mi> <s:mn>2</s:mn> </s:msub> <s:msub> <s:mi>Ga</s:mi> <s:mn>5</s:mn> </s:msub> </s:mrow> </s:math> is a phonon-mediated two-gap <u:math xmlns:u="http://www.w3.org/1998/Math/MathML"> <u:mi>s</u:mi> </u:math> -wave superconductor. Published by the American Physical Society 2024
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.004 | 0.004 |
| Research integrity | 0.001 | 0.005 |
| Insufficient payload (model declined to judge) | 0.185 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".