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Rev. B"],"accepted":{"date-parts":[[2025,5,7]]},"abstract":"<jats:p>\n                    Another polar phase was discovered in lead hafnate\n                    <a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <a:mrow>\n                        <a:msub>\n                          <a:mi>PbHfO<\/a:mi>\n                          <a:mn>3<\/a:mn>\n                        <\/a:msub>\n                      <\/a:mrow>\n                    <\/a:math>\n                    single crystal below 270 K. The transition was manifested through complex permittivity anomalies with a thermal hysteresis of approximately 30 K. While pristine\n                    <b:math xmlns:b=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <b:mrow>\n                        <b:msub>\n                          <b:mi>PbHfO<\/b:mi>\n                          <b:mn>3<\/b:mn>\n                        <\/b:msub>\n                      <\/b:mrow>\n                    <\/b:math>\n                    crystal was shown to have modest pyroelectric signals of 20\u2013235\n                    <c:math xmlns:c=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <c:mrow>\n                        <c:mi>nC<\/c:mi>\n                        <c:mspace width=\"0.16em\"\/>\n                        <c:mi mathvariant=\"normal\">c<\/c:mi>\n                        <c:msup>\n                          <c:mrow>\n                            <c:mi mathvariant=\"normal\">m<\/c:mi>\n                          <\/c:mrow>\n                          <c:mrow>\n                            <c:mo>\u2013<\/c:mo>\n                            <c:mn>2<\/c:mn>\n                          <\/c:mrow>\n                        <\/c:msup>\n                      <\/c:mrow>\n                    <\/c:math>\n                    , DC field poling at 10\n                    <g:math xmlns:g=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <g:mrow>\n                        <g:mi>kV<\/g:mi>\n                        <g:mspace width=\"0.16em\"\/>\n                        <g:mi mathvariant=\"normal\">c<\/g:mi>\n                        <g:msup>\n                          <g:mrow>\n                            <g:mi mathvariant=\"normal\">m<\/g:mi>\n                          <\/g:mrow>\n                          <g:mrow>\n                            <g:mo>\u2013<\/g:mo>\n                            <g:mn>1<\/g:mn>\n                          <\/g:mrow>\n                        <\/g:msup>\n                      <\/g:mrow>\n                    <\/g:math>\n                    induced a huge polarization of 60\n                    <k:math xmlns:k=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <k:mrow>\n                        <k:mi>\u00b5<\/k:mi>\n                        <k:mi mathvariant=\"normal\">C<\/k:mi>\n                        <k:mspace width=\"0.16em\"\/>\n                        <k:mi mathvariant=\"normal\">c<\/k:mi>\n                        <k:msup>\n                          <k:mrow>\n                            <k:mi mathvariant=\"normal\">m<\/k:mi>\n                          <\/k:mrow>\n                          <k:mrow>\n                            <k:mo>\u2013<\/k:mo>\n                            <k:mn>2<\/k:mn>\n                          <\/k:mrow>\n                        <\/k:msup>\n                      <\/k:mrow>\n                    <\/k:math>\n                    , dramatically larger than values observed in lead zirconate\n                    <p:math xmlns:p=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <p:mrow>\n                        <p:msub>\n                          <p:mi>PbZrO<\/p:mi>\n                          <p:mn>3<\/p:mn>\n                        <\/p:msub>\n                      <\/p:mrow>\n                    <\/p:math>\n                    . The polar nature of this transition was validated through multiple experimental techniques. Similarly to dielectric measurements, the pyroelectric effect showed distinct thermal behavior between cooling and heating cycles. The distinct change in the polarization gap occurring in the polarization\u2013electric field function was observed below the transition. Second harmonic generation measurements have displayed signals sensitive to applied DC fields around the transition point. It was suggested that the mechanism behind this polar transition involves complex interactions within both\n                    <q:math xmlns:q=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <q:mrow>\n                        <q:mi mathvariant=\"normal\">P<\/q:mi>\n                        <q:msup>\n                          <q:mrow>\n                            <q:mi mathvariant=\"normal\">b<\/q:mi>\n                          <\/q:mrow>\n                          <q:mrow>\n                            <q:mn>2<\/q:mn>\n                            <q:mo>+<\/q:mo>\n                          <\/q:mrow>\n                        <\/q:msup>\n                      <\/q:mrow>\n                    <\/q:math>\n                    and\n                    <t:math xmlns:t=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <t:msup>\n                        <t:mrow>\n                          <t:msup>\n                            <t:mrow>\n                              <t:mi mathvariant=\"normal\">O<\/t:mi>\n                            <\/t:mrow>\n                            <t:mn>2<\/t:mn>\n                          <\/t:msup>\n                        <\/t:mrow>\n                        <t:mo>\u2212<\/t:mo>\n                      <\/t:msup>\n                    <\/t:math>\n                    substructures. The possible symmetry of this low-temperature polar phase was considered based on the absence of the piezoelectric coefficients\n                    <v:math xmlns:v=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <v:msub>\n                        <v:mi>d<\/v:mi>\n                        <v:mn>31<\/v:mn>\n                      <\/v:msub>\n                    <\/v:math>\n                    and\n                    <w:math xmlns:w=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <w:msub>\n                        <w:mi>d<\/w:mi>\n                        <w:mn>33<\/w:mn>\n                      <\/w:msub>\n                    <\/w:math>\n                    .\n                  <\/jats:p>","DOI":"10.1103\/ftn5-cx2n","type":"journal-article","created":{"date-parts":[[2025,5,12]],"date-time":"2025-05-12T17:31:24Z","timestamp":1747071084000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Huge low-temperature polarity in the antiferroelectric\n                    <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <mml:mrow>\n                        <mml:msub>\n                          <mml:mi>PbHfO<\/mml:mi>\n                          <mml:mn>3<\/mml:mn>\n                        <\/mml:msub>\n                      <\/mml:mrow>\n                    <\/mml:math>"],"prefix":"10.1103","volume":"111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2116-2362","authenticated-orcid":true,"given":"Krystian","family":"Roleder","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0104rcc94","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Silesia in Katowice"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1078-418X","authenticated-orcid":true,"given":"Andrzej","family":"Majchrowski","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05fct5h31","id-type":"ROR","asserted-by":"publisher"}],"name":"Military University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6117-6876","authenticated-orcid":true,"given":"Jan K.","family":"Zar\u0119ba","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/008fyn775","id-type":"ROR","asserted-by":"publisher"}],"name":"Wroc\u0142aw University of Science and Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1380-6399","authenticated-orcid":true,"given":"Annette","family":"Bussmann-Holder","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/005bk2339","id-type":"ROR","asserted-by":"publisher"}],"name":"Max-Planck Institute for Solid State Research"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6226-1300","authenticated-orcid":true,"given":"Iwona","family":"Lazar","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0104rcc94","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Silesia in Katowice"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6725-1504","authenticated-orcid":true,"given":"Irena","family":"Jankowska-Sumara","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/030mz2444","id-type":"ROR","asserted-by":"publisher"}],"name":"University of the National Education Commission"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0196-7489","authenticated-orcid":true,"given":"Dariusz","family":"Kajewski","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0104rcc94","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Silesia in Katowice"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6724-3811","authenticated-orcid":true,"given":"Andrzej","family":"Soszy\u0144ski","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/0104rcc94","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Silesia in Katowice"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"16","published-online":{"date-parts":[[2025,6,16]]},"reference":[{"key":"ftn5-cx2nCc1R1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRev.82.729","type":"journal-article"},{"key":"ftn5-cx2nCc2R1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.107.L140102","type":"journal-article"},{"key":"ftn5-cx2nCc3R1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.30.6555","type":"journal-article"},{"key":"ftn5-cx2nCc4R1","first-page":"S581","type":"journal-article","volume":"32","author":"G. 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